Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Heat -- Convection"”.
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Analysis & characterization of a flow thermo-electrochemical cell for power generation & heat convection
… cell that generates power from waste-heat, while in parallel convecting this heat away from the source. I also reviewed previous research on the topic of thermo-electric energy generation, governing physics behind thermo-electrochemical energy generation, actual device fabrication, …
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A Model of Transient Heat Transfer in a Packed Bed of Alumina Particles
… study seeks to develop a robust system-scale heat transfer model for a sensible heat storage system. A novel mechanism to simulate axial dispersion and heat loss from the boundary of the sensible heat system to the environment is introduced. The most challenging topics to develop a robust heat …
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A theoretical one-dimensional analysis of the transient temperature and stress distributions in a long cylinder subjected to conductive cooling and heating
… with long cylindrical specimens in fluids, heat transfer within the fluid is described by the heat conduction equations while heat convection is neglected. Analytical solutions for the temperatures and stresses as functions of the time and of the radial coordinate in the cylindrical specimen …
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Heat transfer in silicon - experiments and simulation
The purpose of this thesis is to study the heat transfer in silicon. Silicon is the key semiconductor material, and thermal processing is the traditional method that is used in semiconductor processing. In this research, we can predict the temperature of the silicon wafer during heating. This …
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Flow-through membrane microreactor for intensified heterogeneous catalysis
… Due to the small characteristic lengths, heat convection is always small compared to the internal heat transfer, leading to isothermal reactor behavior with identical gas phase and membrane temperature and a temperature jump at the pore entrance. The isothermal operation even of highly …
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A NUMERICAL STUDY OF NONLINEAR VISCOELASTIC FLOW AND NONISOTHERMAL POWER-LAW FLOW
… a contraction/expansion and a modified Graetz heat transfer problem for power-law fluids between parallel plates are numerically studied. The constitutive model used for the viscoelastic fluid flow extends the Maxwell equation of linear viscoelasticity to the non-linear region by letting both …
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Modelling of transient heat transfer in annealing furnaces
This is a study of heat transfer in a lift-off furnace which is employed in the batch annealing of a stack of coils of steel strip. The objective of the project is to investigate the various factors which govern the furnace design and the heat transfer resistances, so as to reduce the time of the …
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Development of a New Parallel In-Situ Combustion Simulator
… multicomponent three-phase flow, heat convection and conduction, chemical reactions, and mass transfer between phases. In the mathematical model, different governing equations and constraints are involved, forming a complicated PDE (partial differential equation) system. For …
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Vergleich von Strahlungs- und Turbulenzmodellen zur Modellierung von Lichtbögen in SF -6-Selbstblasleistungsschaltern
… and used. The electric arc is modelled by Ohmic heat, convection, heat conduction and radiation included in the energy balance equation and represents a control circuit which controls its temperature profile by specifying only the current. The development of this model is based on a comparison of …
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Thermoelectric Energy Harvesting for Sensor Powering
… contact thermal and electrical resistance, and heat leakage, on the performance of a thermoelectric generator. The heat sink can be another issue for the design of high-performance TEG. An innovative heat sink design integrated with self-oscillating impinging jet generated by the fluidic …
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Zonal flow driven by convection and convection driven by internal heating
In the first part, Rayleigh-Benard convection is studied in a two-dimensional, horizontally periodic domain with free-slip top and bottom boundaries. This configuration encourages mean horizontal flows of zero horizontal wavenumber, which we study as an idealization of zonal flows in tokamaks, …
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Local instantaneous convective heat transfer characteristics from mechanical and supply pulsed radial reattaching nozzles
The heat transfer characteristics of combined mechanically and supply pulsated radial reattaching, CPRJR, nozzles were documented as a function of nozzle exit angle (0° and 20°), non-dimensional gap height (0.05 and 0.13), non-dimensional flow guide height (0.8 and 1.16), mechanical pulsation rate …
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Electrical and Thermal Characterizations of IGBT Module with Pressure-Free Large-Area Sintered Joints
… without chiller, since the thermal resistance of heat convection from bottom copper to the air was included , which was much larger than the sum of the previous layers (from IGBT junction, through the chip-attach layer, to the bottom of DBC substrate). In contrast, thermal impedances became almost …
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Multiphase Microfluidics for Convective Heat Transfer and Manufacturing
… forces for manufacturing and enhance convective heat transfer. These systems have application in drug delivery, biological and chemical micro-reactors, and electronics cooling. First, fluid-fluid interfaces can be used for the generation of particles. At the interface between two fluids in …