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 15 of 15 for “"thermal wave"”.
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A new thermal-wave technique for studying magnetic phenomena occurring at low temperatures.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1965. Ph.D.
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Nondestructive Evaluation Of Thermal Barrier Coatings With Thermal Wave Imaging And Photostimulated Luminescence Spectroscopy
… beyond material limits is by applying thermal barrier coatings (TBCs) to hot section components. TBCs provide a thermal gradient between the hot gases and metallic substrate, and allow an increase in turbine inlet temperatures of 100-150ºC. However, spallation of TBCs can cause …
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Label-free Photothermal Quantitative Phase Imaging with Spectral Modulation Interferometry
The photothermal effect is a way in which chemical contrast can be measured as an optical pathlength or phase change. When a chemical species in a sample absorbs optical energy at a particular wavelength, this absorption raises the temperature at these points in the sample via the photothermal …
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Chemical and Thermochemical Wave Behavior in Multiphase Fluid Flow Through Permeable Media: Wave-Wave Interactions
… reactive flow. These regions are separated by waves, which mark the change in composition from one region to the next. We develop a theory which elucidates the interactions of these chemical waves with those formed from other flowing phenomena. We consider the following interactions: 1.) the …
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Experimental Investigation of Hyperbolic Heat Transfer in Heterogeneous Materials
In previous studies, evidence of thermal wave behavior was found in heterogeneous materials. Thus, the overall goal of this study was to experimentally verify those results, and develop a parameter estimation scheme to estimate the thermal properties of various heterogeneous materials. Two types of …
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Numerical Simulation of Microwave Sintering of Zinc Oxide
… unusual temperature response in the form of a "thermal wave" which begins at the center and propagates towards the surface of a zinc oxide sample, when heated in a microwave cavity without the presence of oxygen. This effect is believed to be caused by the irregular temperature dependence of the …
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Structure property and deformation analysis of polypropylene montmorillonite nanocomposites.
… the compliance in the base PP. The use of thermal wave imaging allowed the identification of ductile failure among materials, but more important, aided the mapping of the elastic and plastic contributions. These are essential concepts in fracture analysis.
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Phonon hydrodynamic transport at elevated temperature
… window, we firstly reported the dispersion of thermal wave, whose velocity increases with decreasing grating period. Our experimental findings are well explained with the interplay among “three fluids”: ballistic, diffusive, and hydrodynamic phonons. We believe our study may stimulate further …
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Phonon hydrodynamic transport at elevated temperature
… window, we firstly reported the dispersion of thermal wave, whose velocity increases with decreasing grating period. Our experimental findings are well explained with the interplay among “three fluids”: ballistic, diffusive, and hydrodynamic phonons. We believe our study may stimulate further …
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Applicability of hybrid methods in engine control system design
… for control was developed to represent the thermal wave behaviour observed in worst-case regenerations, where the soot in the filter burns to create local high temperature regions. A DPF was instrumented and fitted to the diesel engine and tested in the development of this model, …
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Pseudospectral techniques for non -smooth evolutionary problems
… and flux, prior to the propagation of a thermal wave into the medium. There is a considerable amount of literature that has investigated hyperbolic heat transfer under similar conditions, the common problems throughout theses investigations is the presence of numerical oscillation at the …
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Analytical solutions of the steady or unsteady heat conduction equation in industrial devices: A comparison with FEM results
… such as Dirichlet, Neumann or Robin, if the thermal conductivity is constant and isotropic. In the cases where conductivity is anisotropic and strongly dependent by temperature or the material is not homogenous, the exact solution of the energy conservation in the body is not possible due to …
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Energy storage and generation from thermopower waves
… axial heat conduction guides a self-propagating thermal wave along the nano-conduit. The thermal conduit accelerates the wave by rapidly transporting energy to un-reacted fuel. The reaction wave induces what we term a thermopower wave, resulting in an electrical current in the same direction. At …
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Pyrolysis and Flamelet Model for Polymethyl Methacrylate in Solid Fuel Sc(ramjet) Combustors
… interactions between coherent pressure waves and the burning walls of the cavity. These limitations in current models suggest the need for a Navier-Stokes solver based on a high-order, discontinuous Galerkin method, incorporating melt layer equations and enhanced combustion manifolds. …
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Numerical Simulation of Adiabatic Shear Bands and Crack Propagation in Thermoviscoplastic Materials
… be governed by a hyperbolic heat equation; thus thermal and mechanical waves propagate with finite speeds. The formation and propagation of an adiabatic shear band (ASB) inplane strain tensile deformations is studied for eleven materials. The ASB is assumed to form when the maximum shear stress …