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Rozprawy doktorskie na temat „Thermal CFT”

Autor: Grafiati

Data publikacji: 23 listopada 2024

Data aktualizacji: 31 lipca 2025

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1

Štikonas, Andrius. "Entanglement entropy of locally perturbed thermal systems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28910.

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In this thesis we study the time evolution of Rényi and entanglement entropies of thermal states in Conformal Field Theory (CFT). These quantities are usually hard to compute but Ryu-Takayanagi (RT) and Hubeny-Rangamani-Takayanagi (HRT) proposals allow us to find the same quantities using calculations in general relativity. We will introduce main concepts of holography, quantum information and conformal field theory that will be used to derive the results of this thesis. In the first part of the thesis, we explicitly compute entanglement entropy of the rotating BTZ black hole by directly apply

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Vilatte, Matthieu. "Adventures in (thermal) Wonderland." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. https://theses.hal.science/tel-04791687.

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Le travail que nous présentons dans cette thèse est structuré autour de la notion de théorie des champs et de géométrie, qui sont appliquées à la gravité et la thermalisation.En gravité, notre travail donne un éclairage nouveau sur la structure asymptotique du champ gravitationnel dans le contexte des espace-temps asymptotiquement plats, ceci en utilisant l'information codée sur leur bord conforme. Ce dernier est une hypersurface de genre lumière sur laquelle émerge la physique carrollienne au lieu de la physique relativiste. Une structure carrollienne sur une variété est constituée une métriq

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3

Somarathne, Shini. "Dynamic thermal modelling using CFD." Thesis, Brunel University, 2003. http://bura.brunel.ac.uk/handle/2438/5523.

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Buildings expend vast quantities of energy, which has a detrimental impact on the environment. Buildings systems are often oversized to cope with possible extreme environmental conditions. Building simulation provides an opportunity to improve building thermal design, but the available tools are typically used in combination in order to overcome their individual deficiencies. Two such tools, often used in tandem are computational fluid dynamics (CFD) and dynamic thermal modelling (DTM). DTM provides a coarse analysis, by considering external and internal thermal conditions over a building (inc

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4

Forster, Robin Norman George. "CFD modelling of vortex combustors." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/770204/.

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This dissertation examines the suitability of Computational Fluid Dynamics (CFD) modelling for the production of realistic flowfields and temperature fields within a series of vortex combustion chambers of differing geometries and operating under various conditions. Initial validation of the CFD predictions was obtained through modelling of a series of isothermal vortex chambers for which a comprehensive set of experimental data was available. It was observed that CFD did indeed produce representative flowfield predictions for chambers of various geometries and operating conditions. A vortex u

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5

Kodajková, Zuzana. "Analýza tepelných ztrát pasivního manekýna ve větrané místnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229197.

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This thesis is about problematics of creating Computational Fluid Dynamics (CFD) model suited for analysis of airflow around sitting passive person. Thesis includes analysis of velocity field distribution, thermal distribution and thermal losses in the surroundings of sitting thermal dummy (computational model) and comparison of these values with experimental measurements. Thesis is a part of large experimental research (this research is not included here) focused on creating of functional method used for person-surrounding airflow analysis in future commercial use.

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Yalcin, Fidan Seza. "Cfd Analysis Of A Notebook Computer Thermal Management Solution." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609483/index.pdf.

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In this study, the thermal management system of a notebook computer is investigated by using a commercial finite volume Computational Fluid Dynamics (CFD) software. After taking the computer apart, all dimensions are measured and all major components are modeled as accurately as possible. Heat dissipation values and necessary characteristics of the components are obtained from the manufacturer&#039<br>s specifications. The different heat dissipation paths that are utilized in the design are investigated. Two active fans and aluminum heat dissipation plates as well as the heat pipe system are m

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7

黎浩然 and Ho-yin Albert Lai. "Artificial intelligence based thermal comfort control with CFD modelling." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B3122278X.

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Lai, Ho-yin Albert. "Artificial intelligence based thermal comfort control with CFD modelling /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21929555.

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Babich, Francesco. "Thermal comfort in non-uniform environments : real-time coupled CFD and human thermal regulation modelling." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/32835.

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Energy consumption in buildings contributes more greenhouse gas emissions than either the industrial or transportation sectors, primarily due to space cooling and heating energy use, driven by the basic human need for thermal comfort and good indoor air quality. In recent years, there has been a proliferation of air conditioning in both residential and commercial buildings especially in the developing economic areas of the world, and, due to the warming climate and the growing disposable income in several densely populated developing countries, the energy demand for space cooling is dramatical

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10

Al-Witry, Ali Qais. "Thermal performance of roll-bonded aluminium plate heat exchanger panels for use in ocean thermal energy conversion." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301658.

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Tunstall, Ryan. "CFD and turbulence modelling for nuclear plant thermal-hydraulics systems." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/cfd-and-turbulence-modelling-for-nuclear-plant-thermalhydraulics-systems(eded8a38-1f77-48d7-b09f-562f41be708f).html.

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Thermal stripping is a major safety challenge in nuclear power generation and propulsion systems. It arises as a consequence of the heat transfer from fluid to surrounding solid components varying in time and typically occurs in regions where the mixing of hot and cold fluids results in turbulent temperature fluctuations. It can occur in a range of components in reactors and thermal-hydraulics systems and may lead to structural failure by high-cycle thermal fatigue. Cases of cooling system pipes failing by this mechanism have been reported at the French Civaux and the Japanese Tsuruga-2 &

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12

Wu, Wei. "CFD calibrated thermal network modelling for oil-cooled power transformers." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/cfd-calibrated-thermal-network-modelling-for-oilcooled-power-transformers(9199cbcc-c6df-4f26-aa9b-dde055ef44ea).html.

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Power transformers are key components of electric system networks; their performance inevitably influences the reliability of electricity transmission and distribution systems. To comprehend the thermal ageing of transformers, hot-spot prediction becomes of significance. As the current method to estimate the hot-spot temperature is based on empirical hot-spot factor and is over-simplified, thermal network modelling has been developed due to its well balance between computation speed and approximation details. The application of Computational Fluid Dynamics (CFD) on transformer thermal analysis

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13

Dong, Nanhang. "CFD modelling of the thermal degradation of biomass in fluidized beds." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/370519/.

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Pyrolysis is considered as a promising technology of recovering bioenergy from biomass into gas, liquid and solid fuels. A series of works have been carried out previously on the fundamentals and the decomposition mechanism of pyrolysis empirically. Based on these experimental works, numerical approaches are employed to achieve a better understanding of the pyrolysis mechanism or aid the applications in experimental and industrial area. In order to construct a systematic model of the thermochemical processes in biomass pyrolysis in a fluidized bed, the mass and heat transfer processes are inve

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14

Samee, Lal Rejish Lal Johnson. "Thermal gas radiation modelling for CFD simulation of rocket thrust chamber." Thesis, KTH, Kraft- och värmeteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261230.

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Methane and oxygen are a promising propellant combination in future rocket propulsion engines mainly due to its advantages like reusability and cost reduction. In order to have a comprehensive understanding of this propellant combination extensive research work is being done. Especially, for reusable rocket engines the thermal calculations become vital as an effective and efficient cooling system is crucial for extending the engine life. The design of cooling channels may significantly be influenced by radiation. Within the framework of this thesis, the gas radiation heat transfer is modelled

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15

Johnson, S. Rejish Lal. "Thermal gas radiation modelling for CFD simulation of rocket thrust chamber." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264357.

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Methane and oxygen are a promising propellant combination in future rocket propulsion engines mainly due to its advantages like reusability and cost reduction. In order to have a comprehensive understanding of this propellant combination extensive research work is being done. Especially, for reusable rocket engines the thermal calculations become vital as an effective and efficient cooling system is crucial for extending the engine life. The design of cooling channels may significantly be influenced by radiation. Within the framework of this thesis, the gas radiation heat transfer is modelled

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16

Pieterse, Jacobus Erasmus. "CFD investigation of the atmospheric boundary layer under different thermal stability conditions." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80024.

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Thesis (MScEng)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: An accurate description of the atmospheric boundary layer (ABL) is a prerequisite for computational fluid dynamic (CFD) wind studies. This includes taking into account the thermal stability of the atmosphere, which can be stable, neutral or unstable, depending on the nature of the surface fluxes of momentum and heat. The diurnal variation between stable and unstable conditions in the Namib Desert interdune was measured and quantified using the wind velocity and temperature profiles that describe the thermally stratified

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17

Bressloff, N. W. "CFD prediction of coupled radiation heat transfer and soot production in turbulent flames." Thesis, Cranfield University, 1996. http://hdl.handle.net/1826/3622.

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The mechanisms governing the formation and destruction of soot in turbulent combustion are intimately coupled to thermal radiation due to the strong dependence of sooting processes and radiative loss on temperature. Detailed computational fluid dynamics (CFD) predictions of the radiative and soot output from turbulent non-premixed flames are normally performed by parabolic algorithms. However, the modelling of combustion systems, such as furnaces and unwanted enclosure fires, often require a fully elliptic description of the flow field and its related physical phenomena. Thus, this thesis inve

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18

Ho, Kwok Yan (Daniel). "Flame Spread Modelling Using FDS4 CFD model." Thesis, University of Canterbury. Civil Engineering, 2007. http://hdl.handle.net/10092/1213.

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This thesis examines the prediction of opposed flow flame spread in the Fire Dynamics Simulator version 4 (FDS4) Computational Fluid Dynamics (CFD) model by adapting the Lateral Ignition Flame Transport (LIFT) test procedure. It should be noted that FDS4 was all that was available at the time of the analysis despite FDS5 is now available for beta testing. This research follows on from previous work where LIFT experiments were conducted for various New Zealand timber and timber based products; those materials include Beech, Macrocarpa, Radiata Pine, Rimu, Hardboard, Medium Density Fibrebo

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19

Bineli, Aulus Roberto Romão 1981. "Simulação numerica CFD no processo de tempera." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267163.

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Orientadores: Rubens Maciel Filho, Andre Luiz Jardini Munhoz<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-14T19:20:20Z (GMT). No. of bitstreams: 1 Bineli_AulusRobertoRomao_M.pdf: 24103427 bytes, checksum: e0dc4ef614d43eab9b12a55f01124378 (MD5) Previous issue date: 2009<br>Resumo: Em tratamentos térmicos de têmpera há uma grande dificuldade em entender os diferentes perfis de resfriamento que ocorrem na superfície e no interior dos materiais, e que definem o controle da estrutura formada e das propriedad

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20

Jeltsov, Marti. "Application of CFD to Safety and Thermal-Hydraulic Analysis of Lead-Cooled Systems." Thesis, KTH, Fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37806.

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Computational Fluid Dynamics (CFD) is increasingly being used in nuclear reactor safety analysis as a tool that enables safety related physical phenomena occurring in the reactor coolant system to be described in more detail and accuracy. Validation is a necessary step in improving predictive capability of a computationa code or coupled computational codes. Validation refers to the assessment of model accuracy incorporating any uncertainties (aleatory and epistemic) that may be of importance. The uncertainties must be identi ed, quanti ed and if possible, reduced. In the rst part of this thesi

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21

Jiao, Yuhe. "CFD Study On The Thermal Performance of Transformer Disc Windings Without Oil Guides." Thesis, KTH, Kraft- och värmeteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102546.

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The hotspot temperature of disc windings has a close relation with the transformer age. In oil immersed transformers, oil guides are applied generally to enhance the cooling effects for disc windings. In some cases disc windings without oil guides are used. However, the lack of oil guides is expected to result in a more complicated thermal behavior of the windings, making it more difficult to predict the location and strength of the hotspot temperature (i.e. the hottest temperature in the winding). To get an improved understanding of the thermal behavior, a CFD study has been performed. This

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Jiao, Yuhe. "CFD Study On The Thermal Performance of Transformer Disc Windings Without Oil Guides." Thesis, KTH, Energiteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102538.

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Jordan, Joshua Daniel. "A CFD Investigation on the Thermal Conductivity of Liquids with Nanoparticle Suspension (Nanofluids)." OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2737.

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Attempts to identify a fundamental mechanism that increases the thermal conductivity of liquids with nanoparticle suspension (nanofluids) have not been entirely successful. Models based on the thermal conductivity of the component materials, volume fraction, and temperature have proven to predict the thermal conductivity well for larger nanoparticles. However, when the nanoparticle size becomes smaller, a large increase in thermal conductivity becomes more prominent at low volume fractions. Indicating an unknown mechanism is contributing to the thermal conductivity enhancement. This research p

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Sagerman, Denton Gregory. "Hypersonic Experimental Aero-thermal Capability Study Through Multilevel Fidelity Computational Fluid Dynamics." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1499433256220438.

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CAGNOLI, MATTIA. "Analysis of thermal losses for CSP applications." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2755757.

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Rafart, Jordi. "Improving of the heat transfer from a moulding block in an industrial oven." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-467.

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<p>This thesis presents a study of the cooling process of a solid block performed by a turbulent air flow channel. The study focuses on the turbulent flow and its influence in the heat transfer of the block.</p><p>The first part of the thesis is an analysis of the different turbulent model and their adaptation on the necessities of this study. Once the turbulent model has been confirmed it makes a study of the behavior of the cooling process by CFD (Computational Fluid Dynamics), and an analysis of the numerical accuracy of this computational study.</p><p>When the procedure of the study of the

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Yousaf, Rehan. "Modelling heat transfer and respiration of occupants in indoor climate." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/25472.

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Although the terms "Human Thermal Comfort" and "Indoor Air Quality (IAQ)" can be highly subjective, they still dictate the indoor climate design (HVAC design) of a building. In order to evaluate human thermal comfort and IAQ, one of three main tools are used, a) direct questioning the subjects about their thermal and air quality sensation (voting, sampling etc.), b) measuring the human thermal comfort by recording the physical parameters such as relative humidity, air and radiation temperature, air velocities and concentration gradients of pollutants or c) by using numerical simulations either

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Hosseini, Moghaddam Seyed Mazyar. "Designing battery thermal management systems (BTMS) for cylindrical Lithium-ion battery modules using CFD." Thesis, KTH, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244459.

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Renewable Energies have the capability to cut down the severe impacts of energy and environmental crisis. Integrating renewable energy generation into the global energy system calls for state of the art energy storage technologies. The lithium-ion battery is introduced in this paper as a solution with a promising role in the storage sector on the grounds of high mass and volumetric energy density. Afterward, the advantages of proper thermal management, including thermal runaway prevention, optimum performance, durability, and temperature uniformity are described. In particular, this review det

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Testa, Samuele. "Airflow fields analysis in bounded domains with CFD methods." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423590.

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In the current work the focus is on natural ventilation occurring in buildings. The first step is to discuss the potential of numerical models applied to determine building performance and air flow as part of a mixed mode building control scheme with respect to a test case. A dynamic simulation software (TRNSYS) is used to estimate the annual energy demand. An optimization program (GenOpt) changes iteratively the parameters regulating the airflow within the building model in order to minimize the whole year energy use. Elements which are considered in the analysis are outdoor climatic conditio

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30

Swar, Rohan. "Particle Erosion of Gas Turbine Thermal Barrier Coating." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1259075518.

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Fakhim, Babak. "Multifaceted Analysis of Data Centre Cooling Using CFD, Experiment and Second Law of Thermodynamics." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/11430.

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The rapid growth in data centres has resulted in their consumption of up to 100 times more energy per square metre than office accommodation. IT equipment and systems, housed in data centres, consume a considerable amount of electricity. Energy consumption of data centres can be severely and unnecessarily high due to inadequate localised cooling and densely packed server rack layouts. To highlight the importance of cooling issues in data centres, operational data centres are studied using computational fluid dynamics (CFD). Field measurements of temperature are performed. Numerical analysis of

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Vaibar, Roman, Thomas Höhne, and Ulrich Rohde. "CFD-Modellierung von Vermischungsvorgängen in Druckwasserreaktoren in Anwesenheit von Dichtegradienten." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-27933.

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In der Reaktorsicherheitsforschung sind auftriebsgetriebene Strömungen von Relevanz für Störfall-szenarien mit Verdünnung der Borkonzentration und für thermische Schockbelastungen des Reak-tordruckbehälters. In der numerischen Simulation der Strömungen werden neben der Berücksichtigung der Auftriebskräfte Quell- und Korrekturterme in die Bilanzgleichungen für die turbulente Energie und die turbulente Dissipation eingeführt. Es wurden erweiterte Modelle entwickelt, in die zusätzliche Gleichungen für die Turbulenzgrößen turbulenter Massenstrom und Dichtevarianz eingehen. Die Modelle wurden in de

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33

Vaibar, Roman, Thomas Höhne, and Ulrich Rohde. "CFD-Modellierung von Vermischungsvorgängen in Druckwasserreaktoren in Anwesenheit von Dichtegradienten." Forschungszentrum Dresden-Rossendorf, 2008. https://hzdr.qucosa.de/id/qucosa%3A21620.

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In der Reaktorsicherheitsforschung sind auftriebsgetriebene Strömungen von Relevanz für Störfall-szenarien mit Verdünnung der Borkonzentration und für thermische Schockbelastungen des Reak-tordruckbehälters. In der numerischen Simulation der Strömungen werden neben der Berücksichtigung der Auftriebskräfte Quell- und Korrekturterme in die Bilanzgleichungen für die turbulente Energie und die turbulente Dissipation eingeführt. Es wurden erweiterte Modelle entwickelt, in die zusätzliche Gleichungen für die Turbulenzgrößen turbulenter Massenstrom und Dichtevarianz eingehen. Die Modelle wurden in de

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34

Nilsson, Håkan O. "Comfort Climate Evaluation with Thermal Manikin Methods and Computer Simulation Models." Doctoral thesis, KTH, Civil and Architectural Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3726.

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<p>Increasing concern about energy consumption and thesimultaneous need for an acceptable thermal environment makesit necessary to estimate in advance what effect differentthermal factors will have on the occupants. Temperaturemeasurements alone do not account for all climate effects onthe human body and especially not for local effects ofconvection and radiation. People as well as thermal manikinscan detect heat loss changes on local body parts. This factmakes it appropriate to develop measurement methods andcomputer models with the corresponding working principles andlevels of resolution. On

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35

Siddique, Waseem. "Design of Internal Cooling Passages: Investigation of Thermal Performance of Serpentine Passages." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-47161.

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Gas turbines are used to convert thermal energy into mechanical energy. The thermal efficiency of the gas turbine is directly related to the turbine inlet temperature. The combustion and turbine technology has improved to such an extent that the operating temperature in the turbine inlet is higher than the melting temperature of the turbine material. Different techniques are used to cope with this problem. One of the most commonly used methods is internal cooling of the turbine blades. Conventionally air from the compressor is used for this purpose but due to higher heat capacity, steam can be

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36

Zhang, Xiang. "Dimensional analysis based CFD modelling for power transformers." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/dimensional-analysis-based-cfd-modelling-for-power-transformers(49cac27d-38b9-4f23-a6ec-b5106422420c).html.

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Reliable thermal modelling approaches are crucial to transformer thermal design and operation. The highest temperature in the winding, usually referred to as the hot-spot temperature, is of the greatest interest because the insulation paper at the hot-spot undergoes the severest thermal ageing, and determines the life expectancy of the transformer insulation. Therefore, the primary objective of transformer thermal design is to control the hot-spot temperature rise over the ambient temperature within certain limit. For liquid-immersed power transformers, the hot-spot temperature rise over the a

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37

Saripalli, Raja. "Simulation of combustion and thermal-flow inside an industrial boiler." ScholarWorks@UNO, 2004. http://louisdl.louislibraries.org/u?/NOD,144.

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Thesis (M.S.)--University of New Orleans, 2004.<br>Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Mechanical Engineering."--Thesis t.p. Vita. Includes bibliographical references.

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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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Colpa, Bekir Onur. "Correlation Based Thermal Design Of Air Transport Rack Chassis." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613517/index.pdf.

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In this thesis, a Thermal Model Tool (TMT) is developed for standard Avionic Transport Rack (ATR) chassis and thermal design of a standard ATR chassis is done using developed TMT. This ATR chassis is a Digital Moving Map (DMAP) of a helicopter and the tool is used to determine the cooling channel details of DMAP. TMT decreases design process steps and eliminates the complexity of the design. Experimental studies are conducted on one of the existing chassis produced in Aselsan Inc. for different operating conditions. There are two different operating conditions for the chassis as 25 &ordm<br>C

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Peksen, Murat. "Numerical modelling of nonwoven thermal bonding process & machinery." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/14703.

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Nonwoven-fabrics have been in use since 1930s. Their advantages over other web fonnation methods like knitting and weaving have attracted many industries such as aerospace, automotive, sports, geotextiles, composites, battery separators etc. to explore and increase their usage. During nonwoven manufacturing, most of the laid loose webs have an insufficient strength as fonned, and require an additional bonding procedure in order to provide the produced nonwoven with its intended properties. To achieve the desired properties of the nonwoven web, the bonding process is therefore, the most importa

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Armstrong, Lindsay-Marie. "CFD modelling of the gas-solid flow dynamics and thermal conversion processes in fluidised beds." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/192155/.

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Naser, Mohammad Yousef Mousa. "Computer Modeling of Solar Thermal System with Underground Storage Tank for Space Heating." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1620875130064807.

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Moghimi, Ardekani Mohammad. "Optical thermal and economic optimisation of a linear Fresnel collector." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/61313.

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Solar energy is one of a very few low-carbon energy technologies with the enormous potential to grow to a large scale. Currently, solar power is generated via the photovoltaic (PV) and concentrating solar power (CSP) technologies. The ability of CSPs to scale up renewable energy at the utility level, as well as to store energy for electrical power generation even under circumstances when the sun is not available (after sunset or on a cloudy day), makes this technology an attractive option for sustainable clean energy. The levelised electricity cost (LEC) of CSP with thermal storage was about 0

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Zhou, Linxiao. "Numerical Studies on Thermal-hydraulic Behaviour of CO2 Energy Piles." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28015.

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Geothermal energy piles (GEPs), buried into the soil, are typically integrated with the circulating pipe inside the piles, where the most common heat transfer fluid (HTF) is water. However, water cannot operate under a sub-zero-degree cold environment without using the antifreeze additive. Carbon dioxide (CO2), which is newly introduced as HTF to save energy by its density difference of flow and circulation, has a more extensive operation range and can operate below zero degrees Celsius as the fluid phase. In this study, GEPs are modelled using a finite element method (FEM) to present the fun

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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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du, Preez Jean-Pierre. "Steam temperature and flow maldistribution in superheater headers." Master's thesis, Faculty of Engineering and the Built Environment, 2020. http://hdl.handle.net/11427/32230.

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Heat exchangers and steam headers are at the heart of any boiler and are susceptible to a range of failures including tube leaks, ligament cracking, creep and fatigue. These common forms of header failure mechanisms can be exacerbated by local thermal stresses due to temperature and flow maldistribution at full and partial boiler load operations. The purpose of this project is to develop process models of the outlet stubbox header of a final superheater (FSH) heat exchanger in a 620MW coal-fired drum type boiler. The process models were used to assess the impact of steam flow and temperature d

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Sen, Firat. "Thermal Management Of Solid Oxide Fuel Cells By Flow Arrangement." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614496/index.pdf.

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Solid oxide fuel cell (SOFC) is a device that converts the chemical energy of the fuel into the electricity by the chemical reactions at high temperatures (600-1000oC). Heat is also produced besides the electricity as a result of the electrochemical reactions. Heat produced in the electrochemical reactions causes the thermal stresses, which is one of the most important problems of the SOFC systems. Another important problem of SOFCs is the low fuel utilization ratio. In this study, the effect of the flow arrangement on the temperature distribution, which causes the thermal stresses, and the me

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Foster, Austin Richard. "Thermal Gradient Characterization and Control in Micro-Fabricated Gas Chromatography Systems." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7481.

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In order to make gas chromatography (GC) more widely accessible, considerable effort has been made in developing miniaturized GC systems. Thermal gradient gas chromatograpy (TGGC), one of the heating methods used in GC, has recieved attention over the years due to it's ability to enhance analyte focusing. The present work seeks to develop high performance miniaturized GC systems by combining miniaturized GC technology with thermal gradient control methods, creating miniaturized thermal gradient gas chromatography (µTGGC) systems. To aid in this development a thermal control system was develope

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Hesaraki, Arefeh. "CFD modeling of heat charging process in a direct-contact container for mobilized thermal energy storage." Thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12763.

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Woldu, Yared, and Anton Fritz. "Using CFD to analyze thermal and optical influence on a zero pressure balloon at floating condition." Thesis, Luleå tekniska universitet, Rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69620.

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The ability to control the trajectory and understanding the atmospheric effects on the flight performance of a scientific high altitude balloon has long been an aspiring ambition. This thesis work analyses the thermal and optical environments at float using the simulation software, ANSYS FLUENT. The objectives for this thesis were to evaluate how the solar angle, sunshine factor and the ground emissivity altered the altitude for the balloon during floating condition in Steady-state simulations. A transient simulation was conducted to evaluate the diurnal cycle effects on the altitude of the ba

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