Academic literature on the topic 'Aluminum fins'
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Journal articles on the topic "Aluminum fins"
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Triqadafi, A. O., T. N. Zafirah, F. J. Kusuma, and S. P. Sakti. "Surface Temperature Distribution of Aluminum Fins Heated using Thermoelectric." Journal of Physics: Conference Series 2013, no. 1 (September 1, 2021): 012012. http://dx.doi.org/10.1088/1742-6596/2013/1/012012.
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Jagadeesh, Duraisamy, Ramasamy Venkatachalam, and Gurusamy Nallakumarasamy. "Experimental and numerical study of an overlay composite absorber plate material for a solar air heater." Materials Testing 63, no. 7 (July 1, 2021): 681–86. http://dx.doi.org/10.1515/mt-2020-0109.
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Abstract The research in this paper is a sequel of an earlier work by the author in which experimental and CFD results were compared for an absorber plate made of iron with and without fins for two flow rates. The research yielded a good comparative result between the experimental and computational process for an optimized flow rate and the effect of the fins. The objective of this paper is to verify the effect of the overlay composite absorber plate material on a solar air heater through experimental and computational fluid dynamics. The experimental setup consists of an absorber plate as an overlay composite of aluminum and copper for enhanced heat transfer. Experiments and CFD analysis were done in three configurations. In configuration one, only the aluminum absorber plate with fins was considered. In configuration two, the overlay composite was considered with copper on the top and aluminum at the bottom as fins, and in configuration three, the overlay composite was considered with aluminum at the top and copper at the bottom as fins. A transient 8 hours CFD analysis was carried out using these configurations. While validating the results it was found that the overlay absorber plate Cu-Al was capable of generating a high outlet temperature Max of 88 °C and capable of generating 83 °C air for 5 hours and had good thermal efficiency when compared to the other materials in the other two configuration. It was found that experimental and computational analysis were in very close agreement, and the margin of error between the experimental and computational processes was less than 8 %.
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Jheng, Wern Dare, Shao Hsien Chen, and Zhi Yu Lin. "The Efficiency of Thermoelectric Chip by Different Heatsink." Applied Mechanics and Materials 121-126 (October 2011): 2974–78. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.2974.
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In this study, aluminum nitride, boron nitride, copper, aluminum, with aluminum extruded heat sink as a cooling way of thermoelectric chip. Heat sink temperature change observed and measured the thermoelectric chip output voltage and current. The results showed that with the aluminum extrusion heat sink will increase the efficiency of thermoelectric chip. Copper + aluminum extrusion heat sink, the average electric power increased 173.93%, while the aluminum + aluminum extruded heat sink mean power increased 212.25 %, while the AlN + aluminum extrusion heat sink fins as mean power increased 197.5 %, And the BN + aluminum extrusion heat sink as a heat sink, the average electric power increased 266.17 %.
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HIROMAE, Yoshitaka, Masahiro KURATA, Michio KOBAYASHI, and Masatsugu SAITO. "Wettability and corrosion resistance of prepainted aluminum fins for heat exchangers." Journal of the Surface Finishing Society of Japan 41, no. 11 (1990): 1187–91. http://dx.doi.org/10.4139/sfj.41.1187.
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BAN, Takumi, Roger LARRABEE, Daisuke IEUJI, Kyoji INAOKA, and Mamoru SENDA. "Heat Transfer Characteristics of a Chanel Flow with Aluminum Fabric Fins." Proceedings of Conference of Kansai Branch 2017.92 (2017): M605. http://dx.doi.org/10.1299/jsmekansai.2017.92.m605.
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Bilen, K., S. Gok, A. B. Olcay, and I. Solmus. "Investigation of the effect of aluminum porous fins on heat transfer." Energy 138 (November 2017): 1187–98. http://dx.doi.org/10.1016/j.energy.2017.08.015.
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Jamin, Yorwearth L., and Abdulmajeed A. Mohamad. "Enhanced Heat Transfer Using Porous Carbon Foam in Cross Flow—Part I: Forced Convection." Journal of Heat Transfer 129, no. 6 (August 15, 2006): 735–42. http://dx.doi.org/10.1115/1.2717240.
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Cogeneration of heat and power has become standard practice for many industrial processes. Research to reduce the thermal resistance in heat exchangers at the gas/solid interface can lead to greater energy efficiency and resource conservation. The main objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins. The study measures the heat transfer rate and pressure drop from a heated vertical pipe, with and without porous medium, in forced convection. The largest increase in Nusselt number was achieved by aluminum fins, which was about three times greater than the best carbon foam case.
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Hussein, Maha A., and Mohammed I. Makhoul. "THE EFFECT OF FINS PERFORATION AND MATERIAL TYPE ON THERMAL PERFORMANCE OF A HEAT SINK UNDER NATURAL CONVECTION." IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 18, no. 3 (November 6, 2018): 446–59. http://dx.doi.org/10.32852/iqjfmme.v18i3.179.
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An experimental study was done to investigate the effect of fin geometrymodification and material type on heat dissipation from a heat sink under natural convection.v-corrugated solid fin and v-corrugated perforated fin were designed for this purpose.Aluminum and Copper metals were selected in designing the fins because their wideapplication in cooling and heating equipment. Three different voltages 110, 150 and 200 Vsupplied to the heat sink to study their effects on the fins performance. Each experimentrepeats two times to reduce the error and the data recorded after reaching the steady stateconditions. The utilization of solid and perforated v-corrugated fins is compared. The resultsshowed that perforated fins dissipated heat more than corresponding solid by 15.4, 34 and32% for aluminum, and 2.7, 2.1 and 4.3% for copper fin in the three voltages. Also, theresults indicated that the heat loss by solid copper fin is greater by 56, 72 and 92% thancorresponding solid aluminum fin and for perforated fin case by 38, 31.7 and 51.9 % at110,150 and 200 V respectively.
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Khan, SheherYar, Adeel Waqas, Naveed Ahmad, Mariam Mahmood, Nadia Shahzad, and Muhammad Bilal Sajid. "Thermal management of solar PV module by using hollow rectangular aluminum fins." Journal of Renewable and Sustainable Energy 12, no. 6 (November 2020): 063501. http://dx.doi.org/10.1063/5.0020129.
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Li, Yongtong, Liang Gong, Minghai Xu, and Yogendra Joshi. "Enhancing the performance of aluminum foam heat sinks through integrated pin fins." International Journal of Heat and Mass Transfer 151 (April 2020): 119376. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.119376.
Full textDissertations / Theses on the topic "Aluminum fins"
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Farjam, Aslan. "Influence of Alumina Addition to Aluminum Fins for Compact Heat Exchangers Produced by Cold Spray Additive Manufacturing." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33383.
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Aluminum and aluminum-alumina powder mixtures were used to produce pyramidal fin arrays on aluminum substrates using cold spray as an additive manufacturing process. Using aluminum-alumina mixtures instead of pure aluminum powder could be seen as a cost-effective measure, preventing nozzle clogging. The fin geometries that were produced were observed using a 3D digital microscope to determine the flow passages width and fins geometric details. Heat transfer and pressure tests were carried out using different ranges of appropriate Reynolds numbers for the sought commercial application to compare each fin array and determine the effect of alumina content. It was found that the presence of alumina reduces the fins’ performance when compared to pure aluminum but that they still outperform traditional fins. Numerical simulations were performed and were used to explain the obtained experimental results. The numerical model opens up new avenues in predicting different parameters such as pressure and substrate temperature.
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Malan, Daniel Johannes. "Latent heat thermal energy storage for solar water heating using flat heat pipes and aluminum fins as heat transfer enhancers." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96140.
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Thesis (MEng) -- Stellenbosch University, 2014.ENGLISH ABSTRACT: Solar energy is a time dependent, high-temperature radiant energy resource. The utility of a solar thermal energy system increases if the hot temperature source is available when it is needed most. This is realized by the thermal storage of the solar energy. Thermal storage gives greater versatility to a solar energy system by decoupling the heat source from the heat sink. A large quantity of energy may be stored during the melting process in a phase change material (PCM) within a small temperature range. This molten PCM can then deliver its absorbed heat at a constant temperature in a heating application. In this study a phase change storage system (PCS) is developed and proposed for a solar water heating application. This PCS system stores more heat per unit mass than would be possible with water across the same temperature range. The heat transfer rate in and out of many PCMs is slow because of the low thermal conductivity of the PCM. However, heat transfer enhancers (HTE), such as heat pipes and fins may be added to enhance heat absorption and heat removal rates. Heat pipes have the inherent capability to transfer heat at high rates across large distances, even where the temperature difference is small. In this thesis a description is given of a PCS system consisting of paraffin wax as the PCM and which uses rectangular heat pipes in conjunction with aluminium fins to enhance heat transfer. The storage design is modular and each module has the characteristic that enhanced heat transfer in and out of the PCM is possible when the module is heated or cooled. It also has the capability to quickly absorb or alternatively to supply heat at a nearly constant temperature during the phase change of the module. A rectangular module was designed and built. The module was then analysed under controlled heat absorption and heat removal cycles. The heat up experiment involved an electrical kettle as the hot temperature source. The heat sink was a mains water heat exchanger. The experimental results were compared to those of a transient numerical model, which calculates theoretically how the module will perform thermally under the given test conditions. The numerical model of the experimental set-up was validated when it was found that the numerical model results resemble the experimental results. The numerical model was then adapted to simulate a novel solar water heater (SWH) with an additional PCS container. The improvement over previous designs is that the additional storage container can be heated to a higher temperature than the allowable geyser temperature. The system also heats up and cools down at a faster rate than would be possible without the HTEs. From the numerical simulation the size and performance of such a system is determined. This numerical analysis indicated that a phase change storage system in a SWH application will increase the hot water delivered by a given solar collector and geyser by increasing the storage capacity and by heating up the geyser overnight for early morning hot water use.
AFRIKKANSE OPSOMMING: Son energie is ‘n tyd afhanklike, hoë temperatuur radiasie energiebron. Die bruikbaarheid van ‘n sontermiese energie sisteem verhoog indien die hoë temperatuur bron beskikbaar is wanneer dit die meeste benodig word. Dit kan verwesenlik word deur die sonenergie termies te stoor. Termiese storing bied groter veelsydigheid aan ‘n sontermiese stelsel deur effektief die hittebron te ontkoppel van die hitte sink. ‘n Groot hoeveelheid energie kan, gedurende die smeltingsproses in ‘n faseveranderingsmateriaal binne ‘n nou temperatuurband gestoor word. Hierdie gesmelte materiaal kan weer op sy beurt in die waterverhittingstoepassing, die geabsorbeerde hitte teen ‘n konstante temperatuur oordra. In hierdie studie word ‘n sonwaterverwarmer stelsel wat aangepas is deur ‘n addisionele latente hittestoor daaraan te heg, voorgestel. Hierdie faseverandering hittestoor kan meer hitte stoor as wat water in dieselfde temperatuur band sou kon. Die hitteoordrag tempo na en van baie van die faseveranderingsmateriale (FVM) is egter as gevolg van die lae termiese geleidingskoëfisient, stadig. Hierdie eienskap kan gelukkig verbeter word deur hittepype en hitteoordrag verhogings materiaal soos vinne by te voeg. Hittepype het die inherente eienskap om hitte teen ‘n hoë tempo oor groot afstande, oor te dra, selfs oor ‘n klein temperatuurverskil. In hierdie tesis word ‘n ondersoek rakende ‘n faseverandering storingsisteem wat bestaan uit paraffien was as die FVM en reghoekige hittepype wat te same met met aluminium finne gebruik word om die hitteoordragtempo te verhoog, beskryf. Die stoorontwerp is modulêr en elke module het die kenmerk van hoë hitteoordrag na en van die FVM. Die module het verder ook die eienskap om vining hitte te absorbeer of hitte af te gee. Dit gebeur teen ‘n konstante temperatuur gedurende die faseverandering van die FVM. Presies so ‘n reghoekige module is ontwerp en gebou en onder beheerde hitte absorbering- en hitte verwyderingsiklusse analiseer. Tydens die verhittings eksperiment is ‘n elektriese ketel van gebruik gemaak wat gedien het as die hoë temperatuur bron. Die hitte sink was ‘n hitteruiler wat kraanwater van ‘n konstante hoogte tenk ontvang het. Die resultate van die volledige toets is met die resultate van tydafhanklike numeriese model vergelyk. Hierdie numeriese model bereken teoreties wat die module se storing verrigting onder gegewe toets omstandighede sal wees. Die numeriese model se resultate het goed vergelyk met die resultate van die eksperimente. Die numeriese model van die module is toe aangepas om ‘n sonwaterverwarmer met addisionele stoortenk wat fase verandering materiaal gebruik, te simuleer. Hierdie ontwerp is anders as vorige ontwerpe in die sin dat hoër temperature as wat die warmwatertoestel kan hanteer, in die faseverandering storingstenk, bereik kan word. Die sisteem kan ook as gevolg van die hitteoordrag verhoging materiaal, vinniger verhit of afkoel en teen ‘n vinniger tempo. Die simulasie van die sonwaterverwarmer met FVM word gebruik om die grootte en verrigting van die sisteem te bepaal. Hierdie numeriese model toon aan dat wanneer ‘n addisionele faseverandering storingstelsel in ‘n sonwaterverwarmer toepassing gebruik word, die warm water wat die verbruiker uit die sisteem kan verkry, kan verhoog. Die rede hiervoor is dat meer hitte gestoor kan word, wat beskikbaar gemaak word aan die warm water tenk.
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Nielsen, Guilherme Fernandes [UNESP]. "Filmes orgânicos contendo óxido de alumínio depositados a plasma." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/99661.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Filmes finos de alumina vêm sendo amplamente estudados em função de suas propriedades físicas e químicas. Em aplicações industriais, filmes de alumina são utilizados, por exemplo, em ferramentas de corte e em circuitos microeletrônicos. Neste trabalho empregou-se o processo de PECVD (do inglês, Plasma Enhanced Chemical Vapor Deposition) para sintetizar fimes contendo óxido de alumínio. Os filmes foram depositados a partir de plasmas excitados por radiofrequencia (13,56 MHz) em misturas de acetilacetonato de alumínio e argônio. Uma configuração experimental inédita foi empregada para permitir a incorporação de alumínio nos filmes: o pó do organometálico foi colocado diretamente no eletrodo por onde um plasma de argônio foi excitado. A pulverização catódica aliada a sublimação do organometálico faz com que haja, em determinadas condições, a deposição de filmes contendo alumina. Foram avaliados os efeitos da pressão do plasma e da potência do sinal de excitação nas propriedades dos filmes resultantes. A técnica de perfilometria foi utilizada para determinar a espessura da camada depositada. Difração de raios X (DRX), com a incidência de ângulos rasantes, foi empregada para investigar a estrutura do material. As técnicas de espectroscopia de absorção no infravermelho por transformada de Fourier (FTIR) e espectroscopia de energia dispersiva (EDS) foram respectivamente utilizadas para analisar a estrutura e a composição química dos filmes. A morfologia das amostras preparadas sobre aço-inoxidável foi analisada por microscopia eletrônica de varredura (MEV) enquanto a dureza foi avaliada por nanoindentação. Foram obtidos filmes amorfos com espessuras de até 7 μm que contêm carbono, alumínio, oxigênio e hidrogênio. Observou-se que as proporções de alumínio e carbono são altamente dependentes da energia cinética dos íons presentes no plasma...
Recently aluminium oxide thin films have been widely studied due to their important physical and chemical properties. Depositions in cutting tools and in microelectronic circuits are examples of industrial applications of industrial applications of aluminum oxide films. In this work, alumina-containing films were prepared by PECVD (Plasma Enhanced Chemical Vapor Deposition) using a new configuration of the plasma system; the metalorganic powder was placed directly on the powered electrode while the substrates were mounted on the grounded topmost electrode. The plasma was excited by applying radiofrequency (13.56 MHz) power to the lower electrode in an argon atmosphere. The sputtering combined with the sublimation of organometallic compound enabled the growth of an alumina-containing organic layer. The effect of the plasma excitation parameters on the properties of the resulting films was studied. Film thickness was measured using profilometry. Grazing angle incidence X-ray diffractometry (GAXRD) was used to determine the structure of the films. Fourier trasnform Infrared Spectroscopy (FTIR) and energy dispersive spectroscopy (EDS) techniques were used to analyze chemical structure and coposition, respectively. The surface morphology was analyzed by scanning electron microscopy (SEM) while film hardness was evaluated by nanoindentation Amorphous organic films were deposited with thicknesses of up to 7 μm. The films were composed of aluminum, carbon, oxygen and hydrogen, the proportions of carbon and aluminum being strongly dependent on the kinetic energy of the ions. The film surface was uniform but presented particulares and, in some cases, wrinkles. The proportion of such defects depends on the plasma excitation parameters
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Gianelli, Bruno Fernando [UNESP]. "Avaliação de ciclo de vida comparativa dos processos de anodização e oxidação eletrolítica com plasma de liga de alumínio." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/110888.
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000798994.pdf: 5087483 bytes, checksum: e305f8ac9c09883578eb80652ff990b6 (MD5)Este projeto se propôs a realizar o tratamento superficial de ligas de alumínio por meio de método de oxidação eletrolítica com plasma (PEO) e elaborar uma avaliação de ciclo de vida (ACV) comparativa entre este processo e o de anodização convencional. Com tal intuito definiu-se como unidade funcional, uma amostra de alumínio AA5052-H34, com 11,1 cm2, sendo que para o processo de PEO empregou-se uma solução de 20 gramas de Na2SiO3 por litro de água deionizada, mantendo a densidade de corrente em i=0,01 a/cm2 e utlizando a mesma solução em 06 séries consecutivas de tratamento. Os resultados de caracterização dos filmes indicaram que as propriedades dos revestimentos começam a divergir após a terceira reutilização da solução. Assim, a quantidade de insumos foi alterada para 6.67 g (Na2SiO3)/333mL (H2O), influenciando a ACV desse tratamento superficial. As resistências à corroção e abrasão foram avaliadas para determinar a vida útil das amostras revestidas por ambos os processos. Com isso verificou-se que a correta relação entre a unidade funcional de ambos os tratamentos é de 26 amostras anodizadas por amostra tratada via PEO. Baseado nos dados expostos realizou-se a ACV dos processos, constatando cinco categorias de impacto relevantes: Combustíveis Fósseis, Respiráveis Inorgânicos, Carcinogêneos, Mudança Climática e Minerais, todas elas com um impacto maior para a anodização. Sendo assim, é possível constatar o menor impacto ambiental do processo de oxidação por plasma eletrolítico em comparação à anodização convencional
The ain of the present was to perform a surface treatment of aluminum alloys through the plasma electrolytic oxidation (PEO) method and implement a life cycle assessment (LCA) comparison between this process and the conventional anodizing. Within this context it was defined a functional unit an aluminum AA5052-H34 sample with 11.1 cm2, whit the PEO process performed using a solution of 20 grams of Na2SiO3 per liter of deionized water and a current density kept at i=0,01 A/cm2. The same solution has been reused for 6 consecutive treatments. The results of film characterization revealed the diverge of the coating properties after the third reutilization of the solution, changing the amount of inputs used to 6.67 g (Na2SiO3) / 333 mL (H2O), affecting the LCA for this surface treatment. Corrosion and wear resistances have been adopted as indicative of the lifetime of samples coated by both methods. According to the results, the corrent relationship between the functional unit of both treatments was defined as 26 anodized as 26 anodized samples to each PEO sample. Based on the above data a LCA was performed for both processes, finding out five relevant impact categories: Fossil Fuels, Inorganic Resp., Carcinogens , Climate Change and Minerals, all them with greater impact on the amodizing. According to the results, it is possible to note a lower environmental impact of PEO surface treatment as compared to conventional anodizing
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Gianelli, Bruno Fernando. "Avaliação de ciclo de vida comparativa dos processos de anodização e oxidação eletrolítica com plasma de liga de alumínio /." Bauru, 2014. http://hdl.handle.net/11449/110888.
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Orientador: Nilson Cristino CruzBanca: Maria Zanin
Banca: Sandro Donnini Mancini
Banca: Antonio Riul Júnior
Banca: Rogério Pinto Mota
Resumo: Este projeto se propôs a realizar o tratamento superficial de ligas de alumínio por meio de método de oxidação eletrolítica com plasma (PEO) e elaborar uma avaliação de ciclo de vida (ACV) comparativa entre este processo e o de anodização convencional. Com tal intuito definiu-se como unidade funcional, uma amostra de alumínio AA5052-H34, com 11,1 cm2, sendo que para o processo de PEO empregou-se uma solução de 20 gramas de Na2SiO3 por litro de água deionizada, mantendo a densidade de corrente em i=0,01 a/cm2 e utlizando a mesma solução em 06 séries consecutivas de tratamento. Os resultados de caracterização dos filmes indicaram que as propriedades dos revestimentos começam a divergir após a terceira reutilização da solução. Assim, a quantidade de insumos foi alterada para 6.67 g (Na2SiO3)/333mL (H2O), influenciando a ACV desse tratamento superficial. As resistências à corroção e abrasão foram avaliadas para determinar a vida útil das amostras revestidas por ambos os processos. Com isso verificou-se que a correta relação entre a unidade funcional de ambos os tratamentos é de 26 amostras anodizadas por amostra tratada via PEO. Baseado nos dados expostos realizou-se a ACV dos processos, constatando cinco categorias de impacto relevantes: "Combustíveis Fósseis", "Respiráveis Inorgânicos", "Carcinogêneos", "Mudança Climática" e "Minerais", todas elas com um impacto maior para a anodização. Sendo assim, é possível constatar o menor impacto ambiental do processo de oxidação por plasma eletrolítico em comparação à anodização convencional
Abstract: The ain of the present was to perform a surface treatment of aluminum alloys through the plasma electrolytic oxidation (PEO) method and implement a life cycle assessment (LCA) comparison between this process and the conventional anodizing. Within this context it was defined a functional unit an aluminum AA5052-H34 sample with 11.1 cm2, whit the PEO process performed using a solution of 20 grams of Na2SiO3 per liter of deionized water and a current density kept at i=0,01 A/cm2. The same solution has been reused for 6 consecutive treatments. The results of film characterization revealed the diverge of the coating properties after the third reutilization of the solution, changing the amount of inputs used to 6.67 g (Na2SiO3) / 333 mL (H2O), affecting the LCA for this surface treatment. Corrosion and wear resistances have been adopted as indicative of the lifetime of samples coated by both methods. According to the results, the corrent relationship between the functional unit of both treatments was defined as 26 anodized as 26 anodized samples to each PEO sample. Based on the above data a LCA was performed for both processes, finding out five relevant impact categories: "Fossil Fuels", "Inorganic Resp.", "Carcinogens ", "Climate Change" and "Minerals", all them with greater impact on the amodizing. According to the results, it is possible to note a lower environmental impact of PEO surface treatment as compared to conventional anodizing
Doutor
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Silva, Marcelo Marques da [UNESP]. "Formação de filmes finos de Al2O3 por anodização e seu uso em dispositivos com filmes de Poli(3-Hexiltiofeno)." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/99672.
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Neste trabalho é apresentada a preparação de filmes finos de Al2O3 usando a técnica eletroquímica de anodização em solução aquosa de etileno glicol e ácido tartárico. Os filmes de Al2O3 foram crescidos sobre camadas de alumínio as quais foram depositadas por evaporação em vácuo sobre lâminas de vidro. No processo de anodização se utilizou a densidade de corrente constante de 0,48 mA/cm2, seguido da aplicação de diferença de potencial constante durante 2 minutos. Filmes com espessuras entre 10 e 60 nm foram crescidos sendo a espessura determinada pela tensão final aplicada na célula. Os filmes de Al2O3 foram caracterizados através de medidas de capacitância e perda dielétrica em função da frequência e das curvas características da corrente elétrica versus a tensão elétrica. Os resultados mostraram que a perda dielétrica é da ordem de 10-3 indicando que os filmes de Al2O3 possuem muito boa qualidade como isolante elétrico. As medidas de corrente versus tensão mostraram que a resistividade elétrica dos filmes é da ordem de 10(13)m. Na parte final do trabalho foi mostrado que os filmes de Al2O3 podem ser usados para a construção do capacitador metal-isolante-semicondutor (MIS) para operar entre no intervalo de tensão de +3V. Além disso, o capacitador MIS apresentou o fenômeno do chaveamento da condução elétrica quando foram aplicadas tensões elétricas elevadas, e, portanto, são candidatos para a fabricação de memórias
This work presents the preparation of Al2O3 films using the electrochemical anodisation tehcnique in aqueous solution of ethylene glycol and tartaric acid. The Al2O3 films were grown from aluminum layers deposited by evaporation in vacuum onto glass slides. The anodisation process was performed using a constant current density of 0.48 mA/cm2 followed by application of a constant voltage during 2 minutes. Films with thicknesses ranging from 10 to 60 nm were grown and the thickness was determined by the final voltage applied to the cell. Films were characterized through measurements of capacitance and dielectric loss versus frequency curves and characteristics of electric current versus voltage. The results showed that the dielectric loss is of the order of 10-3 showing that Al2O3 film is a very good electrical insulator. Current versus voltage measurments showed that the electrical resistivity of the Al2O3 films is of the order of 10(13)m. Finally, it is shown that Al2O3 films can be used to fabricate metal-insulator-semiconductor (MIS) capacitor that can be operated in the voltage range of +3V. The MIS capacitor also presented the electrical conduction switching when the applied voltage was increased, therefore, it can be a candidate to be used as memory
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Ivanova, Nadezda. "Dobudování VUT - Fakulta výtvarných umění." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-227142.
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The object consists of 3 volumes: two 6-storey academic buildings, interconnected with public space. Simple geometry of complex is formed by the existing urban development. Repeating street directions and continuing visual contact with the housing of the Law Faculty, the building in terms of shape represents letter V and forms enclosed courtyards. In the lower part of the building of the Faculty of Fine Arts there are workrooms, library and repository that are loaded from the north facade. The first three floors are connected by a corridor with a recreational area of public space created for a comfortable communicating and solitary classes. On the other floors there are workshops, studios and studio offices of ceramics, sculpture, metal, photography, printing and 3D-graphics, cabinets of deanery and classrooms. On the top floor, that is 6 m height, there are art studios, additionaly lightened by lanterns on the roof. The housing is designed in that way that it has the open airy atrium, which, along with half-transparent facades, provides natural light in most interiors. Facade structure is highlighted with the shell of the vertical and horizontal aluminum fins and shelves, which gives to a compex an interesting and constantly changing pattern. Unified composition is also highlighted with shades of warm and cold colors of the spectrum. Four underground floors are used for car parking, and the ground flloor of them is given for the operation of the university. In the future, the project also envisages planting of greenery of building facades and of the surrounding area.
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Leger, Pierre-Emmanuel. "Rôle de la microstructure sur les mécanismes de corrosion marine d’un dépôt à base d’aluminium élaboré par projection dynamique par gaz froid (« cold spray »)." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM005.
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Le principe de la projection dynamique par gaz froid ou « cold spray » repose sur la projection de particules de poudres convoyées par un gaz à des vitesses supersoniques vers un substrat. La déformation des particules à l’impact avec ce dernier permet la construction d’un dépôt. Ce procédé permet de conserver la microstructure des particules de poudre et de produire des dépôts peu poreux. Cette dernière caractéristique est essentielle dans le cadre d’applications anticorrosion. L’ambition de la thèse est de comprendre le rôle de la microstructure sur les mécanismes de corrosion marine d’un dépôt à base d’aluminium élaboré par cold spray. Pour atteindre cet objectif sont projetées des poudres à base d’aluminium (aluminium pur, alliages d’aluminium et mélanges avec ajout d’alumine) sur un substrat en acier. Les microstructures des dépôts sont étudiées jusqu’à l’échelle nanométrique (MET). L’adhérence des dépôts est mesurée par l’essai de plot collé. A partir des microstructures sont proposés plusieurs mécanismes de formation de la porosité dans un dépôt cold spray à différentes échelles. Une étude numérique par éléments finis complète cette analyse microstructurale. Grâce aux mesures de la vitesse (DPV-2000) et de la température (caméra thermique) d’impact des particules, les paramètres de nouveaux modèles matériau sont optimisés pour simuler le comportement de l’aluminium et de l’alumine à l’impact. De plus, plusieurs essais de corrosion marine (immersion et brouillard salin) sont conduits. L’étude des microstructures corrodées permettent d’établir différents mécanismes de corrosion du dépôt cold spray. Un lien entre la porosité du dépôt et son comportement en corrosion est notamment montré. Enfin, une première approche du transfert de technologie du procédé à l’échelle industrielle est décriteCold spray process is based on spraying particles carried by a gas at a supersonic speed onto a substrate. Particle deformation during impact with the substrate creates a coating. This spraying process can retain particle microstructure and produce very dense coating. This property is crucial for anticorrosion applications. The aim of this work is to understand the effect of cold spray aluminum coating microstructure on marine corrosion mechanisms. To achieve this goal, several aluminum powders (including pure aluminum, aluminum alloys and mixtures with alumina) are sprayed onto a steel substrate. Coating microstructure is studied down to a nanoscale (TEM). The coating-substrate bond strength is determined using pull-off testing. From a thorough microstructure study, various mechanisms are proposed to explain multiscale porosity formation in coatings. A numerical study using finite elements modeling complements this microstructure analysis. From particle speed (DPV-2000) and temperature (thermal camera) measurements during impact, new material models are optimized to model aluminum and alumina behavior at particle impact. Moreover, corrosion tests are conducted (including immersion and salt spray tests). The study of corroded coating microstructures is used to identify corrosion mechanisms which occur in the coating. A relationship between coating porosity and its corrosion behavior is particularly brought into light. Finally, a first approach to a technological transfer of this process to an industrial application is proposed
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Dehurtevent, Marion. "Élaboration d'une céramique dentaire par stéréolithographie." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0036.
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La stéréolithographie, technique additive de mise en forme couche par couche, permet de limiter les contraintes de l’usinage mais doit répondre aux exigences des normes dentaires en vigueur pour son utilisation clinique. L’effet de la formulation de différentes céramiques alumineuses mises en barbotines et de l’orientation des modèles lors de la mise en forme ont été évalués. Ces travaux ont permis de développer et d’optimiser les différentes étapes de stéréolithographie à masque dynamique sans racleur et les propriétés physiques et mécaniques des céramiques densifiées adaptées à une application dentaire. Pour cette application, la mise en forme des barbotines était assurée lorsque la viscosité est inférieure ou égale à 138 mPa.s. Lorsque la viscosité était supérieure ou égale à 151 mPa.s, la mise en forme est impossible. L’augmentation du taux de matière sèche des barbotines d’alumine a augmenté la viscosité et la durée minimale nécessaire à la mise en repos avant photo-polymérisation. La diminution de la proportion de la phase organique a permis de limiter l’apparition de défauts et d’augmenter les propriétés mécaniques des céramiques. Le compromis entre un taux de matière sèche élevé et une viscosité maximale à ne pas dépasser a permis de sélectionner la barbotine avec un taux matière sèche de 80% et une grande granulométrie, comme meilleure formulation pour une utilisation dentaire. Lors de la mise en forme, l’augmentation de la surface des couches polymérisées a augmenté la durée de mise en repos des barbotines mais également le risque d’apparition de défauts dans les pièces. Ceci est à l’origine d’une diminution des propriétés mécaniques des céramiques. La surface maximale des couches pour ce type de procédé doit donc être limitée. Parallèlement, l’analyse microstructurale de l’alumine pure densifiée a montré une texturation. En effet, l’axe principal des grands grains suit l’orientation des couches, ce qui peut induire des propriétés mécaniques anisotropes. Plus précisément, lorsque ces grains étaient orientés perpendiculairement à la charge, la ténacité (par flexion) des céramiques a augmenté par rapport à celles des céramiques dont l’axe principal des grains était orienté parallèlement à la charge. Enfin, la répartition du stress dans une infrastructure de bridge, analysée par la méthode des éléments finis, était comparable entre les céramiques mises en forme par stéréolithographie et les céramiques usinées commercialisées. En vue d’une utilisation clinique, les céramiques mises en forme par stéréolithographie sans racleur doivent donc être orientées afin de présenter la plus faible surface de couche. Si l’axe principal des grands grains dans la céramique suit l’axe de la mise en forme, ces particules doivent être orientées perpendiculairement à la charge occlusale. Enfin, des études complémentaires sont nécessaires pour étudier la précision d’adaptation d’une infrastructure sur la préparation dentaire afin d’optimiser son ajustageStereolithography is a layer-by layer additive manufacturing method. It allows to reduce the strains that occur with milling methods. Its use for clinical purposes needs to follow dental material standards. The impact of slurry composition and the influence of layer orientation on mechanical and physical properties have been studied. This work permitted to develop and optimize a stereolithographic manufacturing process with digital light processing with no blade in order to obtain suitable physical and mechanical properties of alumina ceramics for dental applications. The slurries could be processed by stereolithography when their viscosity was below 138 mPa.s. Viscosity values beyond 151 mPa.s caused deformations in the printed layers. High dry matter content increased the viscosity and the minimal time needed to relax the slurries before photopolymerization. Reduction of the organic phase reduced the formation of defects and thus increased mechanical strength of the ceramics. The compromise between a high dry matter content and low viscosity that is compatible with stereolithography manufacturing was found for 80% dry matter content slurries having large particle size. The great layer surfaces increased the period needed to relax the slurries between two polymerizations, and the risk of defects to appear. This can reduce mechanical strength of the ceramics. To avoid this drawback, the maximal surface of the printed layers should be limited. In addition, microstructural analysis showed a texturation of pure densified alumina. In fact, the main axis of large particles followed the orientation of the printed layers. This led to anisotropic mechanical properties. Moreover, an orientation of these particles perpendicular to the load increased fracture toughness (measured by flexural strength) of the ceramics compared to those of ceramics presenting particles oriented parallel to the load. Finally, compared finite element analysis of a bridge framework showed similar strain repartition between stereolithographic and subtractive methods. In conclusion, stereolithography with no blade of dental ceramics need to orientate the models in order to present the smallest layer surfaces. If the axis of the large particles is the same as the printing axis, these particles must be oriented in order to be perpendicular to masticatory forces. More studies are required to evaluate the marginal gap between prosthetic frameworks and dental crown preparations to allow clinical use
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Lunas, Fabrícia Roberta [UNESP]. "Caracterização de filmes finos de ZnO dopados com Al e Mn depositados em substrato vítreo pelo método de Spray Pirólise." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/91987.
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Neste trabalho foram depositados em substrato vítreo, filmes finos de Óxido de Zinco puro (ZnO) e dopados com alumínio (ZnO:Al) e manganês (ZnO:Mn), utilizando a técnica spray-pirólise. Foram investigadas as propriedades estruturais, ópticas e elétricas dos filmes, assim como, a dependência com a temperatura de deposição e concentração. As temperaturas utilizadas para deposição dos filmes finos foram 400 ºC e 450 ºC, e a concentração de dopantes variaram de 1 a 5 átomo por cento (at%). As técnicas de difração de raios-X e espectroscopia por refletância no infravermelho foram utilizadas para avaliar as características estruturais dos filmes. A Espectroscopia de transmitância na região do UV-Vis foi utilizada como uma das técnicas no estudo das propriedades ópticas, fornecendo valores da banda proibida. A técnica do ângulo de Brewster, foi utilizada com o intuito de avaliar o índice de refração e a espessura dos filmes finos. A avaliação da resistividade foi realizada com a finalidade de estudar a propriedade elétrica, e medidas do efeito Hall para investigar a densidade dos portadores de carga e mobilidade dos filmes semicondutores. A análise dos difratogramas de raio-X, revela picos de difração típicos de uma estrutura policristalina tipo wurtzita. As medidas de refletância especular por FTIR identificam ligações de estiramento do Zn-O na região de 450 cm-1. A técnica do ângulo de Brewster fornece resultados das espessuras dos filmes finos na faixa de 150 a 240 nm. As medidas de espectroscopia de transmitância na região UV-vis é avaliada em torno de 85%. Com os resultados da espessura dos filmes pelo ângulo de Brewster e medidas de transmitância foi calculado na região de forte absorção o coeficiente de absorção destes filmes. O valor do coeficiente de absorção é um parâmetro fundamental para determinação da banda de energia proibida...
In this work were deposited in glass substrate, thin films of pure zinc oxide (ZnO) and doped with aluminum (ZnO: Al) and manganese (ZnO: Mn) used the spray-pyrolysis technique. The structural, electrical and optical properties of thin films were investigated in dependence the concentration and temperatures deposition. The thin films temperatures deposition were 400 °C and 450 º C, and the doping concentration were from 1 at% to 5 at% range. The deposition technique used aims to obtain good adhesion to the substrate and uniformity of the films. The X-ray diffraction spectroscopy and infrared reflectance were used to evaluate the structural characteristics of the films. The UV-Vis transmittance spectroscopy was used in the study of optical properties, providing values of band gap. The other technique for this purpose is the Brewster angle technique in order to evaluate the refractive index and thickness of thin films deposited on a glass substrate. The resistivity and Hall Effect measurements were used for to investigate the charge carriers density and mobility in semiconductor films. The analysis of the X-ray diffraction shows typical peaks of polycrystalline wurtzite structure. Measurements the FTIR specular reflectances identify bond stretching of Zn-O in the region of 450 cm-1. The Brewster angle technique provides results the thin films thickness in the 150 to 240 nm range. The thin films UV/VIS transmittance measurements are valued around 85%. With the results of the thin film thickness by Brewster angle and measures transmittance were calculated the absorption coefficient data values in strong absorption region. The absorption coefficient is an important parameter for determination the band gap energy. These values, for the ZnO semiconductor is in 3.2 eV range. The resistivity’s measurements by Van der Pauw method showed the resistivity of ZnO thin films doped with... (Complete abstract click electronic access below)
Books on the topic "Aluminum fins"
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Tail fins and two-tones: The guide to America's classic fiberglass and aluminum runabouts. Marblehead, MA: Devereux Books, 2006.
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Swisher, Douglas Lee. Production of ultra-fine grains and evolution of grain boundaries during severe plastic deformation of aluminum and its alloys. Monterey, Calif: Naval Postgraduate School, 2000.
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Association, Aluminum, ed. Guidelines for handling aluminum fines generated during various aluminum fabricating operations. Washington, D.C: Aluminum Association, 2002.
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Mallorca, Jacqueline. The Perfect Dinner: Fine Food Cooked With Foil. Fair Oaks Press, 1999.
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Die Aluskulptur (Aluminium Sculpture): Franz West. Verlag Der Buchhandlung Walther Konig, 2000.
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(Editor), Eric G. Derouane, and Stanley M. Roberts (Editor), eds. Catalysts for Fine Chemical Synthesis, Microporous and Mesoporous Solid Catalysts (Catalysts For Fine Chemicals Synthesis). Wiley-Interscience, 2007.
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Production of Ultra-Fine Grains and Evolution of Grain Boundaries During Severe Plastic Deformation of Aluminum and its Alloys. Storming Media, 2000.
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Trieloff, Mario. Noble Gases. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190647926.013.30.
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This is an advance summary of a forthcoming article in the Oxford Encyclopedia of Planetary Science. Please check back later for the full article.Although the second most abundant element in the cosmos is helium, noble gases are also called rare gases. The reason is that they are not abundant on terrestrial planets like our Earth, which is characterized by orders of magnitude depletion of—particularly light—noble gases when compared to the cosmic element abundance pattern. Indeed, such geochemical depletion and enrichment processes make noble gases so versatile concerning planetary formation and evolution: When our solar system formed, the first small grains started to adsorb small amounts of noble gases from the protosolar nebula, resulting in depletion of light He and Ne when compared to heavy noble gases Ar, Kr, and Xe: the so-called planetary type abundance pattern. Subsequent flash heating of the first small mm to cm-sized objects (chondrules and calcium, aluminum rich inclusions) resulted in further depletion, as well as heating—and occasionally differentiation—on small planetesimals, which were precursors of larger planets and which we still find in the asteroid belt today from where we get rocky fragments in form of meteorites. In most primitive meteorites, we even can find tiny rare grains that are older than our solar system and condensed billions of years ago in circumstellar atmospheres of, for example, red giant stars. These grains are characterized by nucleosynthetic anomalies and particularly identified by noble gases, for example, so-called s-process xenon.While planetesimals acquired a depleted noble gas component strongly fractionated in favor of heavy noble gases, the sun and also gas giants like Jupiter attracted a much larger amount of gas from the protosolar nebula by gravitational capture. This resulted in a cosmic or “solar type” abundance pattern, containing the full complement of light noble gases. Contrary to Jupiter or the sun, terrestrial planets accreted from planetesimals with only minor contributions from the protosolar nebula, which explains their high degree of depletion and basically “planetary” elemental abundance pattern. Indeed this depletion enables another tool to be applied in noble gas geo- and cosmochemistry: ingrowth of radiogenic nuclides. Due to heavy depletion of primordial nuclides like 36Ar and 130Xe, radiogenic ingrowth of 40Ar by 40K decay, 129Xe by 129I decay, or fission Xe from 238U or 244Pu decay are precisely measurable, and allow insight in the chronology of fractionation of lithophile parent nuclides and atmophile noble gas daughters, mainly caused by mantle degassing and formation of the atmosphere.Already the dominance of 40Ar in the terrestrial atmosphere allowed C. F v. Weizsäcker to conclude that most of the terrestrial atmosphere originated by degassing of the solid Earth, which is an ongoing process today at mid ocean ridges, where primordial helium leaves the lithosphere for the first time. Mantle degassing was much more massive in the past; in fact, most of the terrestrial atmosphere formed during the first 100 million years of Earth´s history, and was completed at about the same time when the terrestrial core formed and accretion was terminated by a giant impact that also formed our moon. However, before that time, somehow also tiny amounts of solar noble gases managed to find their way into the mantle, presumably by solar wind irradiation of small planetesimals or dust accreting to Earth. While the moon-forming impact likely dissipated the primordial atmosphere, today´s atmosphere originated by mantle degassing and a late veneer with asteroidal and possibly cometary contributions. As other atmophile elements behave similar to noble gases, they also trace the origin of major volatiles on Earth, for example, water, nitrogen, sulfur, and carbon.
Book chapters on the topic "Aluminum fins"
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Qian, Jiyu, and Degao Hou. "Thermal Performance of Graphene-Aluminum Based Fins for Heat Sink Application." In Lecture Notes in Electrical Engineering, 518–26. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9441-7_53.
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Euh, Kwangjun, Hyoung-Wook Kim, and Su-Hyeon Kim. "High Strength Aluminum Brazing Sheets for Condenser Fins of Automotive Heat Exchangers." In Light Metals 2014, 233–36. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48144-9_40.
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Euh, Kwangjun, Hyoung-Wook Kim, and Su-Hyeon Kim. "High Strength Aluminum Brazing Sheets for Condenser Fins of Automotive Heat Exchangers." In Light Metals 2014, 233–36. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888438.ch40.
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Jamaluddin, Musthofa, Rendy Adhi Rachmanto, Syamsul Hadi, Chico Hermanu Brillianto Apribowo, Trismawati, and Zainal Arifin. "The Effect of Fins Number Variation on Aluminum Heat Sink to the Photovoltaic Performance." In Proceedings of the 6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, 449–59. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4481-1_43.
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Karnesky, Richard A., Nancy Y. C. Yang, Chris San Marchi, Troy D. Topping, Zhiui Zhang, Ying Li, and Enrique J. Lavernia. "Solute Distribution and Mechanical Properties of Ultra-Fine-Grained Al-Mg Alloys." In ICAA13: 13th International Conference on Aluminum Alloys, 1033–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch154.
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Jin, H., M. Gallerneault, and D. J. Lloyd. "Low Work Hardening And Its Mitigation In Ultra-Fine Grained Aluminum Alloys." In ICAA13: 13th International Conference on Aluminum Alloys, 1741–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch260.
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Malbrel, C. A., P. Somasundaran, M. Francois, J. E. Poirier, and J. M. Cases. "Surface Characterization of Surfactant-Modified Colloidal Alumina." In Advances in Fine Particles Processing, 193–200. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-7959-1_15.
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Tokuoka, Terukazu, Toshihiko Kaji, and Takao Nishioka. "Development of P/M Aluminum Alloy with Fine Microstructure." In Progress in Powder Metallurgy, 781–84. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.781.
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Kang, Suk Bong, Dong Bae Kim, and Jaehyung Cho. "Effect of Nickel Variation and Thermomechanical Treatment on Microstructure and Properties in Aluminum Alloy Fin Stock for Heat Exchanger." In ICAA13: 13th International Conference on Aluminum Alloys, 1719–25. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch257.
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Kern, George M., Fortunato J. Micale, Diego P. Valenzuela, and Jean S. Lavelle. "Hiding Power of Aluminum Pigments in Printed Ink Films." In Surface Phenomena and Fine Particles in Water-Based Coatings and Printing Technology, 59–69. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3812-7_5.
Full textConference papers on the topic "Aluminum fins"
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Parekh, Ashok D., Jyotirmay Banerjee, Mahendra B. Maisuria, and Vimal K. Patel. "Heat Transfer Augmentation Using Fins of Various Cross Section Under Steady State." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14361.
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Extended surfaces or fins are used to enhance the heat transfer rate between a solid and adjoining fluid. An experimental investigation is carried out in the present work to establish the heat transfer characteristic for fins made of varying material and varying cross section. Three different fin sections, circular, square and triangular are considered for the study. Aluminum, brass and copper fins with varying cross section along the length are tested under steady state. Experimental set up consists of a constant temperature bath to maintain desired thermal boundary condition at one end of the fin. Copper constantan thermocouples are used to measure the temperature at different sections of the fin. The experimental results of temperature distribution of the fins are compared with the analytical and numerical results. The effectiveness of fins along the length for all section and materials is also compared.
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Sahray, D., H. Shmueli, N. Segal, G. Ziskind, and R. Letan. "Effect of Fin Pitch and Height on Pin-Fin Heat Sink Performance." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59225.
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In the present work, horizontal-base pin fin heat sinks exposed to free convection in air are studied. They are made of aluminum, and there is no contact resistance between the base and the fins. The sinks have the same base dimensions whereas the fin height and pitch vary. The fins have a constant square cross-section. The effect of fin height and pitch on the performance of the sink is studied experimentally and numerically. In the experiments, the heat sinks are heated using foil electrical heaters. The heat input is set, and temperatures of the base and fins are measured. In the corresponding numerical study, the sinks and their environment are modeled using the Fluent 6.3 software. The results show that heat transfer enhancement due to the fins is not monotonic. The differences between sparsely and densely populated sinks are analyzed for various fin heights.
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Holahan, Maurice F. "Mapping Potential Heatsink Conductance Across the Hydraulic Plane." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73423.
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A systematic examination of parallel plate fin heat sink performance is carried out by means of a parametric study focussed on aluminum and copper fins in air. The objective is to find the maximum available fin conductance of fixed fin volumes as a function of hydraulic operating point. The fin pitch, height, flow length, and thickness/gap solidity are all varied. Peak volumetric conductance fin geometries are established using a search algorithm. The results are presented as a continuous mapping of peak-enabling fin geometry across the flow-pressure hydraulic operating plane. A correlation is presented showing how the peak conductance varies with pressure, fin volume, and material conductivity.
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Shinde, Pradeep, and Cheng-Xian Lin. "Uncertainty Analysis in Louver Fin Aluminum Heat Exchangers." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38411.
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Uncertainty estimate, although an important subject, is not carried out in a consistent way by different researchers. In this paper, the authors performed a systematic analysis to enumerate the uncertainty calculation procedure for the brazed aluminum microchannel heat exchangers with louvered fins. Using the basic method suggested by Moffat (1988), the present study elaborates the uncertainty estimation of Reynolds number, Colburn j-factor, and friction f-factor for a liquid-air brazed aluminum heat exchanger system. The important factors and their calculation procedure associated with the uncertainty analysis are discussed. The procedure is verified and the uncertainties are estimated for a standard microchannel heat exchanger configuration available in the market. The effect of the measurement variables on the uncertainty factor is illustrated in figures. The range of uncertainties for Reynolds number, Colburn j-factor and friction f-factor are examined within the investigate parameter ranges. The study provides the calculation procedures and conditions as future reference for uncertainty analysis of louver fin brazed aluminum heat exchangers, in particular. The paper also discusses uncertainty estimation for heat exchanger systems, in general.
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Lv, Minhui, Hao Peng, and Xiang Ling. "Numerical Simulation on Melting and Solidification of a Phase-Change Material in an Aluminum Plate-Fin Thermal Storage." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56057.
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The numerical simulation on melting and solidification process of a phase-change material (PCM) in an aluminum plate-fin thermal storage was performed in this paper. The phase-change material-naphthalene was stored in the stacked passages with fins while water flew along other adjacent passages with fins as the heat transfer fluid (HTF). The PCM stored or released a large amount of heat during melting or solidification. A three-dimensional numerical model was performed to investigate the effect of flow parameters (inlet temperature and flow velocity of HTF) on the melting and solidification time. The results indicated that the rate of phase change was strongly dependent on the inlet temperature and flow velocity of HTF during storing or releasing heat. And the detail description of solidification process were discussed and presented.
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Sahray, D., H. Shmueli, N. Segal, G. Ziskind, and R. Letan. "Pin-Fin Heat Sink With Horizontal Base and Blocked Edges." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56205.
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In the present work, horizontal-base pin fin heat sinks exposed to free convection in air are studied. They are made of aluminum, and there is no contact resistance between the base and the fins. For the same base dimensions the fin height and pitch vary. The fins have a constant square cross-section. The edges of the sink are blocked: the surrounding insulation is flush with the fin tips. The effect of fin height and pitch on the performance of the sink is studied experimentally and numerically. In the experiments, the heat sinks are heated using foil electrical heaters. The heat input is set, and temperatures of the base and fins are measured. In the corresponding numerical study, the sinks and their environment are modeled using the Fluent 6 software. The results show that heat transfer enhancement due to the fins is not monotonic. The differences between sparsely and densely populated sinks are analyzed for various fin heights. Also assessed are effects of the blocked edges as compared to the previously studied cases where the sink edges were exposed to the surroundings.
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Gharebaghi, Maryam, and Ibrahim Sezai. "Numerical Investigation of a Phase Change Material (PCM) Module With Internal Fins." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32125.
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The main objective of this study is to investigate the enhancement of energy storage rate of a thermal energy storage unit filled with a PCM by inserting a fin array system. Heat is transferred to the unit through its base plates, to which aluminum fins are attached. The PCM, a commercial paraffin wax, is stored between the fins. A mathematical model, based on finite volume method, for a 2-Dimensional domain is developed for solving the melting problem. Transient simulation has been performed for different fin and PCM layer thicknesses, while the ratio of PCM layer to fin thickness is held constant, for different base plate temperatures. Computational results show that the phase change time and consequently heat absorption and release rate depends on thermal and geometrical parameters such as fin spacing, thickness and height. Results are presented in terms of Nusselt number and melt fraction versus time.
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Sahray, D., R. Magril, V. Dubovsky, G. Ziskind, and R. Letan. "Study of Horizontal-Base Pin-Fin Heat Sinks in Natural Convection." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33356.
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The present paper deals with horizontal-base pin fin heat sinks in free convection. The sinks have the same base dimensions and variable fin pitch. They are made of aluminum, and there is no contact resistance between the base and the fins. The fins have a constant square cross-section. The effect of fin pitch on the performance of the sink is studied experimentally and numerically. In the experiments, the heat sinks are heated using foil electrical heaters. The heat input is set, and temperatures of the base and fins are measured. In the corresponding numerical study, the sinks are modeled using the Fluent 6 software. The results show that heat transfer enhancement due to the fins is not monotonic. The differences between sparsely and densely populated sinks are analyzed. Also analyzed are the effects of the sink edges on the total heat transfer. A relative contribution of outer and inner fin rows in the sink is assessed, together with the effect of fin location in the array on the heat transfer rate from an individual fin. Dimensional analysis of the results is attempted, and a correlation presenting the Nusselt number vs. the Rayleigh number is suggested, where the inter-fin spacing serves as the characteristic length.
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Ambirajan, Amrit, S. Prasanna, and S. P. Venkateshan. "The Effect of Directional Radiative Surface Properties on the Performance of Mutually Irradiating Conducting Fins." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22226.
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The problem of mutually irradiating conducting fins is considered in this paper. The problem is analyzed under two types of surface models, namely, diffuse-specular (D-S) model and a directional (Dir) radiative surface property model, for various surface roughnesses and RMS slopes. Metal (aluminum) coated and dielectric (Aluminum oxide) coated surfaces are considered as the two extreme cases. Analysis indicates that dielectric coated surfaces are sensitive to the radiative surface property model while metal coated surfaces are insensitive to the surface property model. Irrespective of the surface property model used metal coated surface show a drastic drop in heat flux for even a slight increase in surface roughness.
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Martínez, Andrés, and Caleb Chiroy. "Effect of Vertical Mini-Fins on External Condensation Heat Transfer." In ASME 2014 Power Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/power2014-32102.
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The purpose of this research is to experimentally study how vertical mini-fins affect the overall heat transfer on a solid surface under external condensation conditions. Filmwise condensation is a major factor when designing steam condensers for thermoelectric power plants. These plants currently account for 40% of freshwater withdrawal and 3% of freshwater usage in the United States. Filmwise condensation averages five times lower heat transfer coefficients than those present in dropwise condensation. Due to the elevated nucleation rates in thermoelectric power plant condensers, filmwise condensation is the dominant condensation regime. The film thickness is directly proportional to the condenser’s overall thermal resistance on a surface under filmwise condensation. This research investigates the potential of mini-fins to mitigate the onset and effect of filmwise condensation, thus reducing thermal resistance and maximizing heat transfer. The overall heat transfer is determined by measuring the temperature gradient across aluminum test sections. The experimental setup was designed to control the cooling load, pressure, and steam quality in order to measure the temperature gradient under steady state conditions. By comparing the overall heat transfer of surfaces with different mini-fins, the optimal surface geometries can be found. Preliminary results show that mini-fins can improve the overall heat transfer ratios. Future work will introduce other mini-fin shapes, as well as focus on investigating the most efficient heat fluxes for each mini-fin.
Reports on the topic "Aluminum fins"
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William Van Geertruyden. Cost-Effective Consolidation of Fine Aluminum Scrap for Increased Remelting Effieciency. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/850286.
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Fliflet, A. W., R. W. Bruce, R. P. Fischer, D. Lewis, and L. K. Kurihara. A Study of Millimeter-Wave Sintering of Fine-Grained Alumina Compacts. Fort Belvoir, VA: Defense Technical Information Center, October 1998. http://dx.doi.org/10.21236/ada354348.
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