Дисертації з теми "Modeling of heat flows"
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Yao, Guang-Fa. "Numerical modeling of condensing two-phase channel flows." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/17678.
Повний текст джерелаPond, Ian. "Toward an Understanding of the Breakdown of Heat Transfer Modeling in Reciprocating Flows." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/477.
Повний текст джерелаPreston, Alastair Thomas Colonius Timothy E. "Modeling heat and mass transfer in bubbly cavitating flows and shock waves in cavitating nozzles /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-12182003-150738.
Повний текст джерелаVincent, Tyler Graham. "Total Temperature Probe Performance for Subsonic Flows using Mixed Fidelity Modeling." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/88867.
Повний текст джерелаDoctor of Philosophy
An accurate measurement of total temperature in turbomachinery flows remains critical for component life models and cycle performance optimization. While many techniques exist to measure these flows, immersed thermocouple based probes remain highly desirable due to well established practices for probe design and implementation in typical industrial flow applications. However, as engine manufacturers continue to push towards higher maximum cycle temperatures and smaller flow passages, the continued use of these probes requires new probe designs considering both improved sensor durability and measurement accuracy. Increased maximum temperatures introduce many challenges for total temperature measurements using conventional immersed probes, including increased influences of conduction, convection, and radiation heat transfer between the sensor, fluid and the surroundings due to large thermal gradients present in real turbomachinery systems. While these effects have been thoroughly described and quantified in the past, the available design models are very limited to specific geometries and flow conditions. In this Dissertation, a more fundamental understanding of the flow behavior around typical vented shield style total temperature probes as a function of probe geometry and operating condition is gained using results from high-fidelity Computational Fluid Dynamics simulations with Conjugate Heat Transfer (CHT) capabilities. Results were further quantified in the form of new empirical correlations necessary for rapid thermal performance evaluations of current and future probe designs. Additionally, a new mixed-fidelity or Reduced Order Modeling (ROM) technique was developed which allows the coupling of high fidelity surface heat transfer data from CFD with a generalized form of the 1-D conducting solid equations for readily predicting the impact of radiation environment and transient errors on sensor performance.
Liao, Meng. "Modeling of fluid flows and heat transfer with interface effects, from molecular interaction to porous media." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1054/document.
Повний текст джерелаThe objectives of the thesis are to study the fluid transport and heat transfer in micro and nano-scale pores. Both experiments and simulations revealed evidence of an enhancement of flow-rate, originated from slip velocity at the solid boundary. On the other hand, the finite thermal resistance at the fluid-solid interface is responsible for the temperature difference between the two phases. These two interface phenomena can have a considerable impact on the permeability and thermal diffusivity of porous media constituted of micro and nano-pores. This contribution focuses on studying the following three issues. First, we examine the slip effects of liquids confined in graphene channel using Green Kubo formalism and Molecular Dynamics method. It is shown that when the solid surface is subject to mechanical uniaxial strain, the friction exhibits anisotropy due to the modification of the potential energy and the dynamics of the fluid molecules. The molecular shapes also play an important factor on the friction discrepancies between two principal directions. The quantification of both effects is addressed. Second, we investigate the rarefied gas regime. In this case, the velocity slip and temperature jump are governed by the collisions between the gas and the solid boundary. Those effects can be determined via the study of scattering kernel and its construction from MD simulation data. To this end, different methods based on statistical learning techniques have been proposed including the nonparametric (NP) kernel and Gaussian mixture (GM) kernel. Finally, the finite element method is used to compute the permeability and the thermal diffusivity of porous media under the influence of the interface effects
You, Lishan. "Computational Modeling of Laminar Swirl Flows and Heat Transfer in Circular Tubes with Twisted-Tape Inserts." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029525889.
Повний текст джерелаHuzayyin, Omar A. "Computational Modeling of Convective Heat Transfer in Compact and Enhanced Heat Exchangers." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313754781.
Повний текст джерелаKhan, Waqar. "Modeling of Fluid Flow and Heat Transfer for Optimization of Pin-Fin Heat Sinks." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/947.
Повний текст джерелаMoglan, Raluca. "Modeling and numerical simulation of flow and heat phenomena in a telecommunication heat cabinet." Rouen, 2013. http://www.theses.fr/2013ROUES060.
Повний текст джерелаIn this thesis we present a new 3D approach for solving the incompressible Navier-Stokes equations under the Boussinesq approximation. The advantage of the developed numerical code is the use of high order methods for time integration (3rd order Runge-Kutta method) and spatial discretization (6th order finite difference schemes). A study of the order of the numerical method was made, followed by an extensive validation for several cases of natural convection. A finite element simulation code for the same problem was developed using FreeFem++, and was validated with respect to the same cases of natural convection. The case of a telecommunication cabinet was treated by modelling interior obstacles generating heat using an immersed boundary method. This method was validated with respect to the finite element simulation, and many other cases from the literature. We present the results for different 2D and 3D configurations, with obstacles differently placed inside the cavity. Results are also presented for the comparison with experimental measurements in a cabinet with two components dissipating heat. The finite element code is finally extended and tested to simulate phase change materials that could serve as passive cooling devices
Momeni, Parham. "Modelling the Effect of Pulsation on Flow and Heat Transfer in Turbulent Separated and Reattaching Flows." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492875.
Повний текст джерелаZHANG, JIEHAI. "NUMERICAL SIMULATIONS OF STEADY LOW-REYNOLDS-NUMBER FLOWS AND ENHANCED HEAT TRANSFER IN WAVY PLATE-FIN PASSAGES." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109015881.
Повний текст джерелаAl-sarraf, Hayder Hasan Jaafar. "Modeling Two Phase Flow Heat Exchangers for Next Generation Aircraft." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1503935509157319.
Повний текст джерелаIzgec, Bulent. "Transient fluid and heat flow modeling in coupled wellbore/reservoir systems." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2801.
Повний текст джерелаRhodes, Matthew D. "Theoretical modeling of onset of ledinegg flow instability in a heated channel." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18898.
Повний текст джерелаHo, Minh Tuan. "Kinetic modeling of the transient flows of the single gases and gaseous mixtures." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4741/document.
Повний текст джерелаA gas inside the microsystems or the porous media is in its non-equilibrium state, due to the fact that the molecular mean free path is comparable to the characteristic dimension of the media. The same state of a gas, called rarefied, is found at high altitude or in the vacuum equipment working at low pressure. All these types of flow can be described by the kinetic models derived from the Boltzmann equation. This thesis presents the development of the numerical tools for the modeling and simulations of the rarefied gas flows. The two models of the full Boltzmann equation, the Shakhov model (S-model) for the single gas and the McCormack model for the gas mixture, are considered. The discrete velocity method is used to the numerical discretization in the molecular velocity space and the TVD-like scheme is implemented in the physical space. The main aspect of this work is centered around the transient properties of the gas flows and, especially, on the transient heat and mass transfer behaviors. However, for some configurations only steady-state solutions are considered and the implicit scheme is developed to reduce the computational cost. Using the proposed numerical approach several types of the transient rarefied single gas flows as well as the binary mixture of the monoatomic gases are studied
Khalifa, Hamdy Elhoussainy Mohammed. "Modeling coupled heat and moisture flow within a bare desert soil." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185882.
Повний текст джерелаSpezia, Kyle. "Numerical Modeling of Fluid Flow and Heat Transfers in Porous Media." Thesis, University of Louisiana at Lafayette, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10003759.
Повний текст джерелаField studies of Cordilleran metamorphic core complexes indicate that meteoric fluids permeated the upper crust down to the detachment shear zone and interacted with highly deformed and recrystallized (mylonitic) rocks. The presence of fluids in the brittle/ductile transition zone is recorded in the oxygen and hydrogen stable isotope compositions of the mylonites, and may play an important role in the thermomechanical evolution of the detachment shear zone. Geochemical data show that fluid flow in the brittle upper crust is primarily controlled by the large-scale fault-zone architecture.
We conduct finite element numerical modeling of groundwater flow in an idealized cross-section of a metamorphic core complex. The simulations investigate the effects of crust and fault permeability fields on groundwater flow. Results show that fluid migration to mid- to lower-crustal levels is fault-controlled and depends primarily on the permeability contrast between the fault zone and the crustal rocks. High fault/crust permeability ratios lead to channelized flow in the fault and shear zones, while lower ratios allow leakage of the fluids from the fault into the crust.
Bard, Ari. "Modeling and Predicting Heat Transfer Coefficients for Flow Boiling in Microchannels." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1619091352188123.
Повний текст джерелаCarapanayotis, Achilles E. "Modeling of fluid flow and heat transfer processes in an engine." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5228.
Повний текст джерелаMasters, Nathan Daniel. "Efficient Numerical Techniques for Multiscale Modeling of Thermally Driven Gas Flows with Application to Thermal Sensing Atomic Force Microscopy." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11574.
Повний текст джерелаStorey, J. Kirk. "Modeling the transient response of a thermosyphon /." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd304.pdf.
Повний текст джерелаMayo, Nardone Pablo Sabino. "Modeling the Heat Flow Dynamics of a Houses Using Stochastic Differential Equations." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302557.
Повний текст джерелаDenna forskning syftar till att utforska nya sätt att bedöma energiprestanda inom bostäder. Huvudsyftetmed detta arbete är att föreslå en värmedynamikmodell baserad på övervakningsdata för att bidra till enenergieffektiv övergång inom byggsektorn. En omfattande studie av tillgängliga matematiska och statistiska verktyg beskrivs för att bestämma enhelhetslösning, som finns i gråboxmodeller. Denna modellstrategi ger möjlighet att förstå multivariatasystem, som kan tillämpas på en hushålls värmedynamik. Genom den iterativa processen att testa varje möjlig modell bestämmer detta arbete den med bästförklarande kraft, och definierar de studerade husenhetens termiska egenskaper. Denna metod gör detmöjligt att upptäcka underpresterande bostäder bland anläggningar med hög energieffektivitetsstandard. Denna undersökning återspeglar möjligheten att använda gråboxmodeller för att förutsäga dynamiken ivärmerelaterade system. Dessutom lägger den grunden för nya sätt att använda övervakningsdata förbostäder.
Montagna, Cimarelli Viktor Donna. "Stream Identification in Pinch Analysis : Fixed and Flexible flows." Thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-34281.
Повний текст джерелаGarcia-Hermosa, M. Isabel. "Morphodynamics of sand mounds in shallow flows." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:c6ef38f8-d098-4ce5-b0f0-38e2ebe6caf5.
Повний текст джерелаAtharifar, Hosein. "Material flow and heat transfer modeling, monitoring, and optimization of friction stir welding." Ann Arbor, Mich. : ProQuest, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3305958.
Повний текст джерелаTitle from PDF title page (viewed Mar. 16, 2009). Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1895. Adviser: Radovan Kovacevic. Includes bibliographical references.
Fransen, Rémy. "LES based aerothermal modeling of turbine blade cooling systems." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10012/1/fransen.pdf.
Повний текст джерелаBanete, Olimpia. "TOWARDS MODELING HEAT TRANSFER USING A LATTICE BOLTZMANN METHOD FOR POROUS MEDIA." Thesis, Laurentian University of Sudbury, 2014. https://zone.biblio.laurentian.ca/dspace/handle/10219/2200.
Повний текст джерелаXu, Wenyue. "Towards numerical modeling of two-phase flow in seafloor hydrothermal systems." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/26014.
Повний текст джерелаPreetham, Preetham. "Modeling the Response of Premixed Flames to Flow Disturbances." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19817.
Повний текст джерелаVarela, Ballesta Sylvana Verónica. "Computational and experimental modeling of fluid flow and heat transfer processes in complex geometries." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/80717.
Повний текст джерелаThe main objective of this work is the numerical (caffa3d.MB) and experimental (PIV) study of the velocity and temperature fields in complex domains like those encountered in computers or other electronic refrigerated systems with printed circuit board (PCB). Cooling is one of the main challenges these devices have to deal with. Heat removal from the electronic circuit devices has become an important issue to take into account during their design. PCB's are electronic circuits that generate heat by Joule effect and need to be cooled down. They are becoming smaller and therefore some warming problems appear that lowers their efficiency and lifespan. The study of the velocity and temperature fields is closely connected with the analysis of the spatial and temporal evolution of the flow structures found in PCB enclosed cavities and with the understanding of the influence of the geometry, the inlet fluid velocity and plate temperature in the cooling process of the PCB.
Dongaonkar, Amruta J. "Numerical Modeling and Analysis of Fluid Flow and Heat Transfer in Circular Tubes Fitted with Different Helical Twisted Core-Fins." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377866455.
Повний текст джерелаBen, Nasr Ouissem. "Numerical simulations of supersonic turbulent wall-bounded flows." Phd thesis, INSA de Rouen, 2012. http://tel.archives-ouvertes.fr/tel-01059805.
Повний текст джерелаVondál, Jiří. "Computational Modeling of Turbulent Swirling Diffusion Flames." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234149.
Повний текст джерелаKeshmiri, Amir. "Thermal-hydraulic analysis of gas-cooled reactor core flows." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/thermalhydraulic-analysis-of-gascooled-reactor-core-flows(29335acf-a397-4b8c-8217-fd2ee0d26967).html.
Повний текст джерелаRocha, José Renê de Sousa. "Modeling and numerical simulation of fluid flow and heat transfer of a steel continuous casting tundish." reponame:Repositório Institucional da UFC, 2017. http://www.repositorio.ufc.br/handle/riufc/24518.
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Currently, the continuous casting process is the most used technique to produce steel. Being an inherently component of the caster machine, the tundish has been designed to be not only an intermediate vessel between the ladle and the mold, but also a device to remove inclusions and a metallurgical reactor. Therefore, the tundish has an important role in the continuous casting process. The physical model for heat transfer and fluid flow into the tundish is very complex, thus analytical solutions are not available. Physical studies might present many difficulties for analyzing the process. Hence, Computational Fluid Dynamics (CFD) emerges as an attractive alternative. CFD is based on numerical approaches that are used to solve several classes of engineering problems. The main goal of the present study is to analyze the fluid flow and temperature fields into an actual tundish configuration that is used in continuous casting processes of a local steelmaker company. Based on the performed simulations, some modifications in the geometry of the tundish are proposed in order to improve the steel quality; these modifications make use of weirs and dams. For solving the governing equations arising from the physical model, the Ansys CFX software, which is based on the Element-based Finite-Volume Method (EbFVM) were used. Simulations were performed using water and steel as working fluids for a turbulent flow in a 3D tundish. The results were presented in terms of velocity and temperature fields and Residence Time Distribution (RTD) curves, which evaluated them qualitatively and quantitatively.
O processo de lingotamento contínuo é o processo mais utilizado na produção de aço atualmente. Sendo um importante componente da máquina de lingotamento, o distribuidor tem sido projetado para atuar não apenas como um reservatório entre a panela e o molde, mas também como um dispositivo para remoção de inclusões e servir como um reator metalúrgico. Logo, o distribuidor assume um papel de relevância no processo de lingotamento contínuo. O modelo físico que rege a transferência de calor e escoamento dentro do distribuidor apresenta grande complexidade, tornando a sua solução analítica indisponível. Estudos físicos podem apresentar várias dificuldades para a análise do processo. Portanto, a Dinâmica dos Fluidos Computacional (CFD) surge com uma alternativa viável. CFD é baseada em aproximações numéricas as quais são utilizadas para a solução de várias classes de problemas de engenharia. O principal objetivo do presente trabalho é analisar os campos de escoamento e temperatura no interior de um distribuidor o qual é utilizado nos processos de lingotamento contínuo de uma companhia siderúrgica local. Com base nas simulações realizadas, modificações na geometria do distribuidor são propostas com o intuito de aumentar a qualidade do aço. Essas modificações são feitas através do uso de diques e barragens. Para a solução das equações de conservação originadas do modelo físico, o programa Ansys CFX, o qual utiliza o Método dos Volumes Finitos baseado em Elementos (EbFVM), foi utilizado. As simulações foram feitas utilizando-se aço e água como fluidos de trabalho para um escoamento turbulento em um distribuidor tridimensional. Os resultados foram apresentados em termos de campos de velocidade e temperatura e curvas de Distribuição de Tempo de Residência (RTD) as quais serviram para analisá-los qualitativa e quantitativamente.
Su, Yung-Chieh. "Selection of Prediction Methods for Thermophysical Properties for Process Modeling and Product Design of Biodiesel Manufacturing." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32675.
Повний текст джерелаMaster of Science
Зіменко, Сергій Вікторович. "Моделювання теплових втрат через огороджувальні конструкції складної форми". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/24683.
Повний текст джерелаThe volume master's thesis equals 113 pages, quantity of figures – 51, tables – 48, applications – 2. The purpose of the master's dissertation is the assessment of the heat-protective properties of the enclosing structures of residential buildings of non-standard constructions. During the implementation of the master's thesis, existing software and instrumental tools, valuation techniques on an example of a housing stock, approaches to reducing the level of heat transfer of fencing structures, the economic effect of implementing energy efficient projects taking into account the results of modeling and their impact on the overall energy balance of the building were considered. Based on the software analysis section, the preconditions have been created and the need for implementation of the project startup has been determined, for which a potential market entry strategy has been identified. The results of this dissertation have been actively implemented in the practical process of energy survey and can be used in the fields of engineering and design.
lamnaouer, mouna. "NUMERICAL MODELING OF THE SHOCK TUBE FLOW FIELDS BEFORE ANDDURING IGNITION DELAY TIME EXPERIMENTS AT PRACTICAL CONDITIONS." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4095.
Повний текст джерелаPh.D.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering PhD
Nigon, Benoit [Verfasser], Christophe [Gutachter] Pascal, and Andreas [Gutachter] Englert. "Fracture flow and heat transport modeling using natural joint surfaces / Benoit Nigon ; Gutachter: Christophe Pascal, Andreas Englert ; Fakultät für Geowissenschaften." Bochum : Ruhr-Universität Bochum, 2019. http://d-nb.info/1175205028/34.
Повний текст джерелаFarough, Aida. "A Parameterized Approach to Partitioning Between Focused and Diffuse Heat Output and Modeling Hydrothermal Recharge at The East Pacific Rise 9°50´N." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/78062.
Повний текст джерелаMaster of Science
Chen, Tao Verfasser], Christoph [Akademischer Betreuer] [Clauser, Olaf [Akademischer Betreuer] Kolditz, and Gabriele [Akademischer Betreuer] Marquart. "Upscaling permeability for fractured porous rocks and modeling anisotropic flow and heat transport / Tao Chen ; Christoph Clauser, Olaf Kolditz, Gabriele Marquart." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1180733703/34.
Повний текст джерелаChen, Tao [Verfasser], Christoph [Akademischer Betreuer] Clauser, Olaf [Akademischer Betreuer] Kolditz, and Gabriele [Akademischer Betreuer] Marquart. "Upscaling permeability for fractured porous rocks and modeling anisotropic flow and heat transport / Tao Chen ; Christoph Clauser, Olaf Kolditz, Gabriele Marquart." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1180733703/34.
Повний текст джерелаVenkata, Padma Priya. "Computational modeling of heat and mass transfer in planar SOFC effects of volatile species/oxidant mass flow rate and electrochemical reaction rate /." Cincinnati, Ohio : University of Cincinnati, 2008. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1205169104.
Повний текст джерелаCommittee/Advisors: Raj M Manglik PhD (Advisor), Milind A Jog PhD (Committee Member), Anastasios P Angelopoulos PhD (Committee Member) Title from electronic thesis title page (viewed April 23, 2008). Includes abstract. Keywords: SOFC, Solid oxide fuel cells, ASR, interconnect, CFD, heat and mass transfer, electrochemistry. Includes bibliographical references.
VENKATA, PADMA PRIYA. "Computational Modeling of Heat and Mass Transfer in Planar SOFC: Effects of Volatile Species/Oxidant Mass Flow Rate and Electrochemical Reaction Rate." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1205169104.
Повний текст джерелаHu, Chih-Chieh. "Mechanistic modeling of evaporating thin liquid film instability on a bwr fuel rod with parallel and cross vapor flow." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28148.
Повний текст джерелаCommittee Chair: Abdel-Khalik, Said; Committee Member: Ammar, Mostafa H.; Committee Member: Ghiaasiaan, S. Mostafa; Committee Member: Hertel, Nolan E.; Committee Member: Liu, Yingjie.
Hill, David. "Numerical modeling of flow and heat transfer in friction stir welding a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=2000384991&SrchMode=1&sid=4&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1277841643&clientId=28564.
Повний текст джерелаChatziefstratiou, Efthalia. "SIMULATION OF TREE STEM INJURY, AIR FLOW AND HEAT DISPERSION IN FORESTS FOR PREDICTION OF FIRE EFFECTS." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1420644169.
Повний текст джерелаDruet, Pierre-Etienne. "Analysis of a coupled system of partial differential equations modeling the interaction between melt flow, global heat transfer and applied magnetic fields in crystal growth." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2009. http://dx.doi.org/10.18452/15893.
Повний текст джерелаThe present PhD thesis is devoted to the analysis of a coupled system of nonlinear partial differential equations (PDE), that arises in the modeling of crystal growth from the melt in magnetic fields. The phenomena described by the model are mainly the heat-transfer processes (by conduction, convection and radiation) taking place in a high-temperatures furnace heated electromagnetically, and the motion of a semiconducting melted material subject to buoyancy and applied electromagnetic forces. The model consists of the Navier-Stokes equations for a newtonian incompressible liquid, coupled to the heat equation and the low-frequency approximation of Maxwell''s equations. We propose a mathematical setting for this PDE system, we derive its weak formulation, and we formulate an (initial) boundary value problem that in the mean reflects the complexity of the real-life application. The well-posedness of this (initial) boundary value problem is the mainmatter of the investigation. We prove the existence of weak solutions allowing for general geometrical situations (discontinuous coefficients, nonsmooth material interfaces) and data, the most important requirement being only that the injected electrical power remains finite. For the time-dependent problem, a defect measure appears in the solution, which apart from the fluid remains concentrated in the boundary of the electrical conductors. In the absence of a global estimate on the radiation emitted in the cavity, a part of the defect measure is due to the nonlocal radiation effects. The uniqueness of the weak solution is obtained only under reinforced assumptions: smallness of the input power in the stationary case, and regularity of the solution in the time-dependent case. Regularity properties, such as the boundedness of temperature are also derived, but only in simplified settings: smooth interfaces and temperature-independent coefficients in the case of a stationary analysis, and, additionally for the transient problem, decoupled time-harmonic Maxwell.
Nop, Raksmy. "Experimental investigation and modeling of the transient flow boiling crisis of water at moderate pressure and high subcooling." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST046.
Повний текст джерелаIn case of a reactivity insertion accident in an experimental nuclear reactor, heat generation in the core can grow exponentially in time, with a power escalation period ranging from a few to a few hundreds of milliseconds. Due to neutronic and thermohydraulic effects, boiling crisis may arise, possibly leading to an explosive reaction. If the boiling Crisis has been widely investigated in steady-state conditions, this has not been the case for transient heat inputs. The aim of the present work is to understand and to predict the transient flow boiling crisis in the conditions of moderate pressure and high subcooling. To this end, an experimental campaign has been realized making use of space and time highly resolved videos and IR thermography covering a wide range of experimental parameters. The analysis of the massive amount of data produced by these experiments gives a better insight on the dependency of the transient Critical Heat Flux to the different parameters of interest (power escalation period, flow velocity, subcooling, pressure, channel width, heating length). Moreover, their fine analysis enables to highlight the underlying mechanisms. For conditions of forced flow and high subcooling, the bubbles generated at the wall present a pulsating behavior. This specific process leads to an efficient heat transfer from the wall to the neighboring fluid. Boiling crisis is stated to occur when a thin layer of liquid contacting the wall reaches the saturation temperature. Starting from these observations, a model is developed which brings to light two non-dimensional parameters useful to describe the transient nature of the process and the dominant cooling processes. With the knowledge of the steady-state CHF, the model permits to conservatively estimate the value of the Critical Heat Flux for any power escalation period and subcooling. This model is now ready for implementation into simulation codes to investigate nuclear accidental transients
Kestel, Matthias. "Numerical modeling of moving carbonaceous particle conversion in hot environments." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-204732.
Повний текст джерела