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Dissertations / Theses on the topic 'Thermal stratification'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Ruiz, Zoë. "The physical limnology and dissolved oxygen regimes of small eutrophic lakes." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268582.

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2

Domínguez, Espinosa Francisco Alonso. "Determining thermal stratification in rooms under mixing and displacement ventilation." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104255.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 322-331).<br>Computational Fluid Dynamics (CFD) simulations of a typical office under both mixing and displacement ventilation were performed to study the effects of room geometry (height and area of the supply), ventilation parameters (supply momentum and heat gain intensity) and radiation heat transfer on the thermal stratification of the air and the temperatures of the surfaces in the space. The air stratifi
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3

Menchaca, Brandan María Alejandra. "Study of airflow and thermal stratification in naturally ventilated rooms." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74907.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 253-257).<br>Natural ventilation (NV) can considerably contribute to reducing the cooling energy consumption of a building and increase occupant productivity, if correctly implemented. Such energy savings depend on the number of hours that NV can maintain the indoor air temperature within comfort levels. CoolVent, currently the only simple multizone simulation tool that can adequately model the physics of NV in buildi
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4

Romero, Hamers Adolfo. "STUDY OF THE THERMAL STRATIFICATION IN PWR REACTORS AND THE PTS (PRESSURIZED THERMAL SHOCK) PHENOMENON." Doctoral thesis, Editorial Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/36536.

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In the event of hypothetical accident scenarios in PWR, emergency strategies have to be mapped out, in order to guarantee the reliable removal of decay heat from the reactor core, also in case of component breakdown. One essential passive heat removal mechanism is the reflux condensation cooling mode. This mode can appear for instance during a small break loss-of-coolant-accident (LOCA) or because of loss of residual heat removal (RHR) system during mid loop operation at plant outage after the reactor shutdown. In the scenario of a loss-of-coolant-accident (LOCA), which is caused by the leak
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5

Hermansson, Roger. "Short term water heat storage : an experimental investigation of thermal stratification." Licentiate thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 1989. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17844.

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6

Smyth, Mervyn A. "Design and development of a heat retaining integrated collection/storage solar water heater." Thesis, University of Ulster, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264693.

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7

Swiatek, Marie. "Etude de la convection naturelle et de la stratification thermique dans une cavité inclinée et chauffée au milieu : application aux capteurs solaires autostockeurs." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAA026/document.

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La réglementation thermique sur les bâtiments en France impose le recours aux énergies renouvelables. L'énergie solaire, à la fois thermique et photovoltaïque, présente un grand potentiel en termes de disponibilité. Néanmoins, du fait de son caractère intermittent, des systèmes de stockage associés sont nécessaires. Pour ce qui est des systèmes solaires thermiques, les capteurs solaires intégrant le stockage (CSIS) ont pour avantages une grande simplicité ainsi que des coûts réduits comparés à des systèmes plus classiques. Ils permettent également d'éviter la problématique de la mise en place
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8

King, Jacquelynne R. "The response of lake thermal stratification to climatic conditions and effects on fish growth." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0017/NQ27676.pdf.

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9

SANTO, MARCO ANTONIO. "Large-eddy simulation of wind-driven circulation in a peri-alpine lake: implications of complex surrounding orography and thermal stratification on hydrodynamics of Lake Ledro." Doctoral thesis, Università degli Studi di Trieste, 2017. http://hdl.handle.net/11368/2908202.

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In the present thesis I investigate the wind-driven circulation and mixing in a peri-alpine lake (Lake of Ledro) located in Trentino Alto Adige (Italy). It represents an interesting case study because of two main reasons: it is surrounded by mountains, which affect wind distribution and consequently produce a non homogeneous wind stress of the lake surface; in recent years the lake has suffered for intense blooms of the harmful cyanobacterium \textit{Planktothrix Rubescens}, occurring in the winter season, characterized by the absence stratification. The study is carried out numerically, usin
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10

Langhans, Robert Florian. "Liquid Sodium Stratication Prediction and Simulation in a Two-Dimensional Slice." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/76725.

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In light of rising global temperatures and energy needs, nuclear power is uniquely positioned to offer carbon-free and reliable electricity. In many markets, nuclear power faces strong headwinds due to competition with other fuel sources and prohibitively high capital costs. Small Modular Reactors (SMRs), such as the proposed Advanced Fast Reactor (AFR) 100, have gained popularity in recent years as they promise economies of scale, reduced capital costs, and flexibility of deployment. Fast sodium reactors commonly feature an upper plenum with a large inventory of sodium. When temperatures chan
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11

Brar, Pardeep Singh. "CFD evaluation of pipeline gas stratification at low fluid flow due to temperature effects." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1511.

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It has been found through experiments at Southwest Research Institute that temperature differences between the gas and wall of the pipe through which the gas is flowing can greatly influence the gas flow in the pipe line and give different velocity magnitudes at the top and bottom half of the pipe. The effect on the flow is observed to worsen at low fluid flow and high temperature differences. This effect has been observed by ultrasonic flow meters which measure the chord average gas velocity at four heights across the pipe. A significant variance in chord averaged velocities is apparent at th
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12

Rusaouën, Éleonore. "Échanges turbulents en convection thermique." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0937/document.

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La problématique des échanges turbulents en convection thermique est abordée au travers de deux écoulements complémentaires en eau, Prandtl compris entre 2.5 et 6.5.Le premier est une cellule de Rayleigh-Bénard asymétrique. La plaque chaude située au bas de la cellule présente des rugosités périodiques de taille contrôlée. La plaque froide en haut de la cellule est, au contraire, lisse. Le flux de chaleur est imposé à la plaque chaude. Dans la gamme de forçage explorée dans ce travail, les deux plaques sont indépendantes ce qui permet une comparaison in-situ entre une plaque lisse et une plaqu
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13

Thebault, Martin. "Coherent structures and impact of the external thermal stratification in a transitional natural convection vertical channel." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1327/document.

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Dans les écoulements de convection naturelle en canal, de nombreuses structures cohérentes se développent. Leur rôle dans les transferts de masse et de chaleurs reste aujourd’hui mal connu. Des études numériques basées sur des Simulations aux Grandes Echelles d’un canal vertical dont un des côtés est chauffé uniformément à flux constant ont donc été entreprises. Différentes étapes de la transition laminaire-turbulente sont identifiées et deux bandes de fréquences sont observées en proche paroi chauffée. Une méthode, basée sur la Proper Orthogonal Decomposition (POD), a aussi été utilisée et a
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14

Cheng, Wai-chi, and 鄭偉智. "Wind and pollutant removal of urban street canyons under different thermal stratification by RANS and LES models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46289653.

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15

Mahasaranon, Sararat. "Acoustic and thermal properties of recycled porous media." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5516.

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This thesis is concerned with developing porous materials from tyre shred residue and polyurethane binder for acoustic absorption and thermal insulation applications. The resultant materials contains a high proportion of open, interconnected cells that are able to absorb incident sound waves through viscous friction, inertia effects and thermal energy exchanges. The materials developed are also able to insulate against heat by suppressing the convection of heat and reduced conductivity of the fluid locked in the large proportion of close-cell pores. The acoustic absorption performance of a por
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16

Filich, Lukasz. "Modeling and Simulation of Thermal Stratification and Mixing induced by Steam Injection through Spargers into Large Water Pool." Thesis, KTH, Fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170404.

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17

Pentagna, Robert Pasquale Paulo [UNESP]. "Modelo matemático para análise de problemas de estocagem de líquidos que apresentam estratificação térmica." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/90813.

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Made available in DSpace on 2014-06-11T19:24:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-08-22Bitstream added on 2014-06-13T20:47:19Z : No. of bitstreams: 1 pentagna_rpp_me_bauru_prot.pdf: 1054031 bytes, checksum: c2f515f7ab29cf3aa3f199133c8d8d15 (MD5)<br>outros - empresas<br>Foi desenvolvido um modelo matemático para descrever o processo de estocagem de energia via estratificação térmica de líquido em um tanque. Neste modelo foi considerado um balanço de energia para o sistema de estocagem e proposto um modelo matemático unidimensional e transiente capaz de descrever o históri
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18

Marchi, Neto Ismael de. "Levantamento de coeficientes de desempenho de refrigeradores domésticos associados a armazenador térmico /." Bauru : [s.l.], 2007. http://hdl.handle.net/11449/136747.

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Orientador: Alcides Padilha<br>Banca: Celso Luiz da Silva<br>Banca: Marcos Pinotti Barbosa<br>Resumo: Devido à extrema necessidade de se diversificar as fontes de energia renováveis, torna-se necessário a busca por métodos de reciclagem de energia pela utilização de rejeitos térmicos de equipamentos. Assim, o aproveitamento desses rejeitos pode ser utilizado, como uma nova fonte de energia, para o aquecimento de água e armazenamento da mesma em reservatório para uso doméstico. Devido a isso, é proposta a construção de um aparato experimental de um reservatório de armazenamento térmico cilíndri
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19

Di, Nezio Pedro N. "Climate Response of the Equatorial Pacific to Global Warming." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/157.

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The climate response of the equatorial Pacific to increased greenhouse gases is investigated using numerical experiments from five climate models participating in the Intergovernmental Panel on Climate Change Fourth Assessment Report. Changes in the heat budget of the surface layer in response to CO2 doubling (2xCO2) are analyzed in experiments with full-coupled ocean dynamics; and compared to experiments with uncoupled ocean dynamics. In full-coupled experiments, weaker ocean zonal currents driven by a slowing down of the Walker circulation reduce the ocean heat flux divergence throughout the
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20

Berg, Anders. "Numerical and experimental study of the fluid flow in porous medium in charging process of stratified thermal storage tank." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123498.

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In order to increase the efficiency of an adsorption heat pump system, a stratified thermal heat storage can be used to enable regeneration of heat between the different phases of the process. It’s crucial to avoid mixing and to keep layers intact inside the storage tank. As mixing generally occurs during charging and discharging, the aim of this project is minimizing these effects by introducing porous media into the region of the inlet ports. The impact of porous media on laminar and turbulent flow inside stratified thermal storage tanks is qualitatively and quantitatively investigated. Two
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21

Oliveira, Santiago del Rio [UNESP]. "Aplicação da técnica de elementos finitos na estratificação de armazenadores térmicos com barreiras de meios porosos." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/90811.

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Made available in DSpace on 2014-06-11T19:24:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2004Bitstream added on 2014-06-13T20:47:18Z : No. of bitstreams: 1 oliveira_sr_me_bauru.pdf: 4056726 bytes, checksum: da2b55b91a9531fddc60a2ca6a750172 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>É desenvolvido um modelo matemático para estudar o comportamento da estratificação térmica de líquido em um tanque armazenador com meio poroso. O tanque considerado é de geometria retangular com relação comprimento-altura igual a 1. O modelo utiliza a formulação transiente d
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22

Yang, Yang. "Phytoplankton and Physical Disturbance : Seasonal dynamics in temperate Lake Erken, Sweden." Doctoral thesis, Uppsala universitet, Limnologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-262461.

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Phytoplankton mirrors changes in the environment and plays an important role in biogeochemical processes. Phytoplankton dynamics is the outcome of both autogenic succession and external disturbances. This thesis focused on the seasonal variation of water column stability and its effects on phytoplankton, particularly considering the influence of mixing events on phytoplankton development. Lake Erken is a dimictic lake with weak and often interrupted summer stratification, which represents an intermediate case between a polymictic lake and a lake with strong summer stratification. There are two
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23

Pentagna, Robert Pasquale Paulo. "Modelo matemático para análise de problemas de estocagem de líquidos que apresentam estratificação térmica /." Bauru : [s.n.], 2004. http://hdl.handle.net/11449/90813.

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Orientador: Alcides Padilha<br>Banca: Ricardo Fortes de Miranda<br>Banca: Vicente Luiz Scalon<br>Resumo: Foi desenvolvido um modelo matemático para descrever o processo de estocagem de energia via estratificação térmica de líquido em um tanque. Neste modelo foi considerado um balanço de energia para o sistema de estocagem e proposto um modelo matemático unidimensional e transiente capaz de descrever o histórico dos perfis de temperatura do líquido e da parede do reservatório durante a operação de carregamento dinâmico. O modelo matemático foi discretizado através da técnica de diferença finita
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24

Oliveira, Santiago del Rio. "Aplicação da técnica de elementos finitos na estratificação de armazenadores térmicos com barreiras de meios porosos /." Bauru : [s.n.], 2004. http://hdl.handle.net/11449/90811.

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Orientador: Alcides Padilha<br>Resumo: É desenvolvido um modelo matemático para estudar o comportamento da estratificação térmica de líquido em um tanque armazenador com meio poroso. O tanque considerado é de geometria retangular com relação comprimento-altura igual a 1. O modelo utiliza a formulação transiente de vorticidade e função corrente para predizer o desenvolvimento dos campos de função corrente e temperaturas durante um processo de carregamento. Foi fixado um número de Reynolds igual a 200 para o escoamento de entrada e uma faixa do número de Richardson de 0,001 a 10. Outros parâmetr
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25

Deemer, Bridget Read. "Thermal stratification impacts microbial nitrogen removal and nitrous oxide production in a small eutrophic reservoir an in-situ approach to quantifying hypolimnetic process rates /." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Thesis/Spring2010/B_Deemer_042310.pdf.

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Thesis (M.S. in environmental science)--Washington State University, May 2010.<br>Title from PDF title page (viewed on July 21, 2010). "School of Earth and Environmental Science." Includes bibliographical references (p. 23-28).
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26

Marchi, Neto Ismael de [UNESP]. "Levantamento de coeficientes de desempenho de refrigeradores domésticos associados a armazenador térmico." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/136747.

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Made available in DSpace on 2016-04-01T17:55:05Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-08-29. Added 1 bitstream(s) on 2016-04-01T18:00:55Z : No. of bitstreams: 1 000505950.pdf: 2040911 bytes, checksum: 6a6c3699938e4a1059984533329b05ad (MD5)<br>Devido à extrema necessidade de se diversificar as fontes de energia renováveis, torna-se necessário a busca por métodos de reciclagem de energia pela utilização de rejeitos térmicos de equipamentos. Assim, o aproveitamento desses rejeitos pode ser utilizado, como uma nova fonte de energia, para o aquecimento de água e armazenamento da
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27

Streckienė, Giedrė. "Research of Heat Storage Tank Operation Modes in Cogeneration Plant." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110621_170138-31454.

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The dissertation investigates typical operation modes of the heat storage tank in the small-scale cogeneration (CHP) plant, analyses formation of thermal stratifi-cation in such storage tank and presents the simulation of the stratification. The main aim of the dissertation is to investigate peculiarities of operation modes of heat storage tank in small-scale CHP plant, develop an algorithm allowing to choose the storage tank volume and present a model allowing determination of thermal stratification in the storage tank at any time of its operation.<br>Disertacijoje nagrinėjami būdingi šilumos
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28

AMIRAT, MADJID. "Contribution a l'etude des serres associees a un habitat : etude et modelisation des transferts thermiques, realisation d'une cellule d'essai." Paris 6, 1986. http://www.theses.fr/1986PA066542.

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29

Kayserilioglu, Yavuz Selim. "Heat Removal From A Large Scale Warm Water Storage." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605359/index.pdf.

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ABSTRACT HEAT REMOVAL FROM A LARGE SCALE WARM WATER STORAGE Kayserilioglu, Yavuz Selim M.S., Department of Mechanical Engineering Supervisor: Prof. Dr. R&uuml<br>knettin Oskay August 2004, 88 Pages A preliminary experimental study was performed in order to investigate the charging and heat removal characteristics of a sensible heat storage. Two sets of experiments were performed at two aspect ratios. Heat removal processes of these two sets were different while the charging processes were similar. In the first set of experiments, after the charging of the storage unit with relatively warm w
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30

Polisel, Kleber Castilho. "Desempenho de lagoas de maturação utilizando macrófitas aquáticas e chicaneamento." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-25012006-091009/.

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As lagoas de estabilização têm sido, por suas características operacionais e baixos custos de implantação, consideradas como a opção mais viável para tratamento de águas residuárias em pequenas e médias comunidades. O sistema composto por lagoa anaeróbia e facultativa em série é o mais empregado no Brasil. Com o avanço no monitoramento das lagoas de estabilização que se iniciou na década de 90, no caso do Estado de São Paulo pela SABESP, e que hoje se encontra bastante estruturado, periódico e confiável, nota-se que esses sistemas apesar de projetados seguindo as técnicas mais recentes, não po
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31

Streckienė, Giedrė. "Kogeneracinės jėgainės šilumos akumuliacinės talpos veikimo režimų tyrimai." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110621_170130-49881.

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Disertacijoje nagrinėjami būdingi šilumos akumuliacinės talpos veikimo režimai, susiformuojantys nedidelės galios kogeneracinėje jėgainėje, tiriamas šiluminės stratifikacijos susidarymas tokioje talpoje ir atliekamas jos modeliavimas. Pagrindinis disertacijos tikslas – ištirti nedidelės galios kogeneracinės jėgainės šilumos akumuliacinės talpos veikimo režimų ypatumus, sudaryti algoritmą, padedantį parinkti tokios talpos tūrį ir pateikti modelį, leidžiantį nustatyti šiluminę stratifikaciją akumuliacinėje talpoje bet kuriuo jos veikimo metu.<br>The dissertation investigates typical operation mo
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Lazeroms, Werner. "Turbulence modelling applied to the atmospheric boundary layer." Doctoral thesis, KTH, Turbulens, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166806.

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Turbulent flows affected by buoyancy lie at the basis of many applications, both within engineering and the atmospheric sciences. A prominent example of such an application is the atmospheric boundary layer, the lowest layer of the atmosphere, in which many physical processes are heavily influenced by both stably stratified and convective turbulent transport. Modelling these turbulent flows correctly, especially in the presence of stable stratification, has proven to be a great challenge and forms an important problem in the context of climate models. In this thesis, we address this issue cons
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Rodríguez, Pérez Ivette. "Unsteady laminar convection in cylindrical domains: numerical studies and application to solar water storage tanks." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6689.

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Los dispositivos de almacenamiento de energía térmica son ampliamente usados en diversos sistemas térmicos caracterizados por un desfase temporal entre la producción de energia y su consumo, como es el caso de los sistemas de energía solar térmica. El diseño optimizado de estos equipos puede representar un considerable aumento en el rendimiento térmico de la instalación de la cual forman parte. En la línea de optimización de sistemas y equipos térmicos, en los últimos años la Mecánica de Fluidos Computacional (CFD) se ha consolidado como una herramienta básica, proporcionando a investigadores
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34

Huhn, Robert. "Beitrag zur thermodynamischen Analyse und Bewertung von Wasserwärmespeichern in Energieumwandlungsketten." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1185976213975-82550.

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Wärmespeicher tragen bei optimierter Integration in Wärme- und Kälteversorgungsanlagen zur Einsparung von installierter Erzeugerleistung, Brennstoffeinsatz und Betriebskosten bei. Leider treten in Wärmespeichern oft noch beachtliche Verluste auf und das Potenzial zur Kosten- und Energieeinsparung wird nicht vollständig ausgeschöpft. Dabei spielen nicht nur Wärmeverluste an die Umgebung, sondern vor allem auch innere Verluste im Speicher eine Rolle. Schwerpunkte der vorliegenden Arbeit sind die Beschreibung der einzelnen Verluste an Wasserwärmespeichern, die Ermittlung ihrer Ausmaße abhängig vo
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Rezende, Hugo Cesar. "Estudo teórico e experimental da estratificação térmica : monofásica em tubulações horizontais." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266765.

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Orientadores: Elizabete Jordão, Moysés Alberto Navarro<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-20T11:58:32Z (GMT). No. of bitstreams: 1 Rezende_HugoCesar_D.pdf: 10614958 bytes, checksum: aa2b2ce9d9ec481bd44e74cc217832a2 (MD5) Previous issue date: 2012<br>Resumo: O escoamento monofásico termicamente estratificado ocorre em tubulações horizontais onde duas camadas diferentes de um mesmo líquido escoam separadamente, sem que ocorra mistura significativa entre as camadas, devido às baixas velocidades e à dife
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MagalhÃes, Frederico Batista. "Qualidade da Ãgua subsuperficial e de fundo no cultivo de tilÃpia em tanques-rede na fazenda campo grande (aÃude Pereira de Miranda, Pentecoste, CearÃ)." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10416.

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A humanidade tem uma importante ligaÃÃo histÃrica com a Ãgua em especial com os Ecossistemas AquÃticos Continentais (EACs) No mundo existem cerca de 1 386 milhÃes de km3 de Ãgua sendo apenas 2 5% Ãgua doce à de extrema importÃncia o conhecimento das variÃveis fÃsico-quÃmicas da Ãgua para prever de forma antecipada os fenÃmenos de estratificaÃÃo e desestratificaÃÃo tÃrmica Assim podendo evita perdas financeiras em empreendimentos aquÃcolas O presente trabalho teve como objetivos determinar quais efeitos a tilapicultura em tanques redes realizada na Fazenda Capo Grande (Pentecoste CearÃ)
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37

Sousa, Mart Som dos Reis. "Nutrientes e fitoplÃncton em reservatÃrio do semiÃrido." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11890.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Os reservatÃrios sÃo ambientes aquÃticos continentais que apresentam relaÃÃo estreita com a bacia de drenagem. Dentre as funÃÃes, ciclagem de fÃsforo e nitrogÃnio à essencial à manutenÃÃo e estruturaÃÃo das comunidades ecolÃgicas, principalmente do fitoplÃncton. A entrada de energia, matÃria por causas naturais e, mais intensivamente antrÃpicas e algumas caracterÃsticas dos reservatÃrios do semiÃrido brasileiro (radiaÃÃo solar, pluviosidade, temperatura e vento) podem possibilitar padrÃes diferenciados das variÃveis fÃsi
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38

Hoeppner, Ana Flávia da Silva. "Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP)." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-132720/.

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As lagoas de estabilização compõem sistemas de tratamento de águas residuárias sujeitos à variação de eficiência decorrente, dentre outros fatores, das variações climáticas. A variação de eficiência e da estratificação em lagoas de estabilização, localizadas em ambiente subtropical, em diferentes épocas do ano, foi o principal objetivo dessa pesquisa. Para essa finalidade, a eficiência de dois sistemas de lagoas de estabilização localizadas no Vale do Ribeira de Iguape (SP) - nas cidades de Jacupiranga e Pariquera-Açu - foi determinada, em período sazonal (quatro épocas do ano) e semanal (três
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39

Avallone, Elson [UNESP]. "Estudo de um coletor solar, tipo tubo evacuado modificado, utilizando um concentrador cilíndrico parabólico (CPC)." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152135.

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40

Santos, Guilherme Henrique Sempionato Souza. "Análise numérica de um sistema integrado coletor solar/armazenador térmico /." Bauru : [s.l.], 2007. http://hdl.handle.net/11449/136670.

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Orientador: Alcides Padilha<br>Banca: Vicente Luiz Scalon<br>Banca: Ricardo Fortes de Miranda<br>Resumo: Este estudo apresenta uma análise numérica dos campos de temperaturas e velocidades d'água durante seu processo de aquecimento via calor sensível no interior de um armazenador térmico cilíndrico, aquecido lateralmente e adiabático em seu topo e base, visando o estudo da condição de operação de um aquecedor de água coletor solar-armazenador integrados (ICSSWH - Integrated Collector-Storage Water Heater). Em uma segunda análise a influência de um defletor interno é estudada pela definição dos
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41

Huhn, Robert. "Beitrag zur thermodynamischen Analyse und Bewertung von Wasserwärmespeichern in Energieumwandlungsketten." Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A23947.

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Wärmespeicher tragen bei optimierter Integration in Wärme- und Kälteversorgungsanlagen zur Einsparung von installierter Erzeugerleistung, Brennstoffeinsatz und Betriebskosten bei. Leider treten in Wärmespeichern oft noch beachtliche Verluste auf und das Potenzial zur Kosten- und Energieeinsparung wird nicht vollständig ausgeschöpft. Dabei spielen nicht nur Wärmeverluste an die Umgebung, sondern vor allem auch innere Verluste im Speicher eine Rolle. Schwerpunkte der vorliegenden Arbeit sind die Beschreibung der einzelnen Verluste an Wasserwärmespeichern, die Ermittlung ihrer Ausmaße abhängig vo
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42

Santos, Guilherme Henrique Sempionato Souza [UNESP]. "Análise numérica de um sistema integrado coletor solar/armazenador térmico." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/136670.

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Made available in DSpace on 2016-04-01T17:54:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-08-10. Added 1 bitstream(s) on 2016-04-01T18:00:20Z : No. of bitstreams: 1 000505772.pdf: 2673100 bytes, checksum: 0b1ec10e248621594ebb61317344d2af (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Este estudo apresenta uma análise numérica dos campos de temperaturas e velocidades d'água durante seu processo de aquecimento via calor sensível no interior de um armazenador térmico cilíndrico, aquecido lateralmente e adiabático em seu topo e base, visando o estudo
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43

Åberg, Jan. "Production and emission of CO2 in two unproductive lakes in northern Sweden." Doctoral thesis, Umeå universitet, Ekologi, miljö och geovetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-26967.

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Unproductive lakes are one of few natural landscape compartments with net release of carbon to the atmosphere. Lakes also generally decrease the net terrestrial carbon uptake, since most of the CO2 production in unproductive lakes are derived from organic carbon produced on land (e.g. in forests). High latitude lakes are predicted to be particularly affected by the global climate change. The carbon cycling in these lakes and their role in the landscape are therefore important to study. In this thesis, carbon turnover processes were studied in two lakes above the arctic circle (Lake Diktar-Erik
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44

Williams, Benjamin Ashley Oliver. "Quantitative laser diagnostics for combustion." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:37ea0034-03ac-4021-80e3-5d72200fbd0e.

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Quantitative Planar Laser Induced Fluorescence (QPLIF) is developed as a diagnostic technique and then applied to a prototype Jaguar optical internal combustion engine. QPLIF derives quantitative, two-dimensional, spatially-resolved measurements of fuel concentration. This work reports the first demonstration of a fully-fractionated surrogate fuel which exhibits all the characteristics of a typical gasoline. This 'pseudo' fuel, developed in association with Shell UK, is blended to accept a fluorescent tracer which may track one of the light, middle or heavy fractions of the fuel, each of diffe
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45

Magalhães, Frederico Batista. "Qualidade da água subsuperficial e de fundo no cultivo de tilápia em tanques-rede na fazenda campo grande (açude Pereira de Miranda, Pentecoste, Ceará)." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/18353.

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MAGALHÃES, Frederico Batista. Qualidade da água subsuperficial e de fundo no cultivo de tilápia em tanques-rede na fazenda campo grande (açude Pereira de Miranda, Pentecoste, Ceará). 2013. 69 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Centro de Ciências Agrárias, departamento de Engenharia de Pesca, Fortaleza-CE, 2013<br>Submitted by Nádja Goes (nmoraissoares@gmail.com) on 2016-07-15T12:09:42Z No. of bitstreams: 1 2013_dis_fbmagalhães.pdf: 1507818 bytes, checksum: 9692206a8b30849b20decf9e956f08ca (MD5)<br>Approved for entry into archive by Nádja Goes (nmoraissoares@gmail.com)
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46

Tisserand, Jean-Christophe. "Convection thermique : transport et mélange." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2010. http://tel.archives-ouvertes.fr/tel-00612953.

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Dans ce manuscrit, nous nous sommes intéressés au phénomène de convection thermique turbulente. La première partie du manuscrit analyse l'influence de la rugosité sur l'efficacité du transport thermique dans des cellules de convection de Rayleigh-Bénard cylindrique et rectangulaire. Au vu des mesures thermiques, une transition claire apparaît lorsque l'épaisseur de la couche limite thermique est égale à la hauteur caractéristique de la rugosité. Au delà de la transition, un nouveau régime apparaît et il ne peut être expliqué par une simple augmentation de la surface d'échange de la plaque rugu
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47

Angelotti, de ponte rodrigues Natalia. "Open water swimming : Monitoring and hydrodynamic modelling for sanitary conditions assessment." Electronic Thesis or Diss., Marne-la-vallée, ENPC, 2023. http://www.theses.fr/2023ENPC0046.

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La baignade en eau libre connait un fort engouement, notamment en milieu urbain où les canicules estivales sont de plus en plus fréquentes. Pour éviter les risques sanitaires, le suivi d’indicateurs de micro-organismes pathogènes, les bactéries indicatrices fécales (BIF) telles que E. coli, est nécessaire. Les résultats des méthodes de référence en laboratoire sont obtenus au mieux en 24h.Pour qu’une baignade soit ouverte au public, les concentrations de BIF doivent être inférieures à des seuils réglementaires. En cours d'eau, ces conditions peuvent être estimées à partir de mesures en un poin
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48

Wallace, Robert Derring. "Mechanisms Causing Ferric Staining in the Secondary Water System of Brigham City, Utah." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/903.

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Water from Mantua reservoir has, during some years, exhibited reddish-brown staining when used by Brigham City for irrigation. I propose that seasonal fluctuations in the reservoir chemistry create an environment conducive to dissolving iron from the iron-rich sediments, which subsequently precipitate during irrigation, resulting in a staining event. These conditions are produced by chemical and biological decomposition of organic matter, coupled with isolation of the hypolimnetic waters, which results in seasonal low concentrations of dissolved oxygen in these waters. Under these specific cir
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49

Findeisen, Fabian. "Radiale Diffusoren in Warmwasserspeichern: Einfluss des Beladesystems auf Strömungsverhalten und Schichtungsqualität". Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21083.

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Radiale Diffusoren beeinflussen signifikant die Qualität der thermischen Schichtung in Warmwasserspeichern. Um die Effizienz der Energiespeicherung zu verbessern, ist das Verständnis des komplexen Strömungsverhaltens notwendig. Diese Arbeit liefert Grundlagen zur Beschreibung der auftretenden Effekte und stellt ein geeignetes CFD-Simulationsmodell vor. Als Untersuchungsobjekt dient eine neuartige Speicherkonstruktion, wobei der Radialdiffusor direkt an einer schwimmenden Decke montiert ist. Vorteile dieser Anordnung werden aufgezeigt, die auftretenden Strömungseffekte beschrieben sowie der Ein
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50

Nguyen, Duy. "An Investigation Of The Effect Of Meanders On Thermally Stratified Riverine Flow." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29567.

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This thesis describes the influences of meander geometrics on thermally stratified open-channel flow. Results of this study contribute toward a greater understanding of the physical characteristics of flow in riverine environments. The presence of thermal stratification due to short-wave solar heating from above inhibits mixing, resulting in oxygen stratification and accumulation of contaminants and nutrients - conditions that have been found to cause long-term damage to the ecosystems. Reduced flow rates can also lead to acute damage events such as cyanobacterial outbreaks and mass fish kill
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