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 13 of 13 for “"Temperature-dependent thermal conductivity"”.
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Applications of thermophysical characterization using the 3-omega technique
The 3-omega technique is a commonly used electrothermal technique to characterize thermal conductivity. While most commonly used to characterize isotropic thin films on substrates, the high accuracy and versatility of the technique can be extended to a broader application space, which are explored …
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Modeling Non-Rotational Ocean Circulation and Heat Distribution in Icy Moons
… in a non-rotating ocean column to investigate thermal structure and energy balance in such systems. A one-dimensional numerical simulation was developed using temperature-dependent thermal conductivity and fixed Dirichlet boundary conditions, initialized with a linear temperature gradient from …
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Development of a nanostructure thermal property measurement platform compatible with a transmission electron microscope
Measurements of the electrical and thermal transport properties of one-dimensional nanostructures (e.g., nanotubes and nanowires) typically are obtained without detailed knowledge of the specimen's atomicscale structure or defects. In an effort to address this deficiency, a microfabricated, …
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Nonlinear heat transfer and thermo mechanical stress analysis using finite elements.
… and the boundary conditions of specified temperatures, flux, convection. and radiation are included. The stress - strain - temperature relationships for a corresponding body are not coupled to the heat transfer relationships for steady state conditions. The heat transfer problem is thus …
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Low temperature, glass-like properties of crystalline beta-alumina
The low temperature properties measured for single crystal Na, Ag, K, and Li B-alumina are characteristic of those found in amorphous materials. The specific heat is dominated below 1 K by a term approximately linear in temperature instead of the cubic dependence normal for crystals. All except K …
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Electrical and thermal transport in 2- and 3-dimensional periodic holey silicon
… in nanostructured silicon e ectively reduces thermal transport, resulting in an enhanced thermoelectric Figure of merit ZT. However, claims of high ZT are quantitatively misleading since electrical and thermal properties are often characterized on separate samples due to measurement …
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A theoretical investigation of thermal waves
… of one-dimensional heat conduction based on thermal relaxation is presented. Thermal relaxation is introduced through the constitutive equation (modified Fourier's law) which relates this heat flux and temperature. The resulting temperature and flux field equations become hyperbolic rather …
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Computational Methods for Studying Phonon Dynamics
… their respective equilibrium positions at finite temperature. This thermal motion can be understood as a superposition of the structure’s normal modes, often termed phonons, which are collective motions of atoms vibrating at certain frequencies. These vibrational modes play important roles in a …
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Novel optimisation methods for numerical inverse problems
… may be boundary heat flux, various source terms, thermal and material properties, boundary shape and size. Solving inverse problems requires additional information through in-situ data measurements of the field variables of the physical problems. These problems are also ill-posed because the …
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Thermomechanical properties of novel lanthanum zirconate based thermal barrier coatings - an integrated experimental and modeling study
<p>Thermal barrier coatings (TBCs) are refractory materials deposited on gas turbine components, which provide thermal protection for metallic components at operating conditions. The current state-of-art TBC material is yttria-stabilized zirconia (YSZ), whose service temperature is limited to 1200 …
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Thermoelectric Properties and Transport of Semicrystalline Conjugated Polymer and Single-Wall Carbon Nanotube Composites
… high power factor of CNT networks and the low thermal conductivity of polymer matrix. Many attempts have been made on achieving the electron-crystal-phonon-glass concept and the simultaneous increase of electrical conductivity and the Seebeck coefficient. However, the thermoelectric transport …
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A lattice boltzmann/s n framework for coupled heat transfer and neutron transport problems
… transport and heat conduction equations with temperature-dependent thermal conductivity and temperature-dependent neutron cross sections. The neutron transport equation is solved using the discrete ordinates method (SN ); and the heat conduction equation is solved using the lattice Boltzmann …
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Functional materials for thermal regulation
Developing thermal management materials with greater functionality for the control of heat dissipation and regulation is a fundamental step to improve the performance in many engineering systems. This dissertation presents experimental studies of heat conduction in distinctive thermal functional …