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 20 of 116 for “"Thermal Radiation"”.
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Thermal Radiation Characteristics of Fluidized Solids.
… based upon the packet model with initial isothermal conditions. The small residence times of the surface eruptions, found experimentally, constrained the flux levels to be almost invariant with time. The analysis was theoretically and experimentally extended to include the conductive heat …
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Water droplet growth enhancement through thermal radiation
This thesis explores how thermal radiation affects water droplet growth in the 20 to 100 μm size range. The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution …
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Thermophotovoltaics : shaping the flow of thermal radiation
… crystals as optical filters and selective thermal emitters for thermophotovoltaic and micro-thermophotovoltaic (micro-TPV)) applications. In addition, we explore fundamental limitations of photonic crystal thermal emitters and provide new insights into the limiting power transfer mechanisms …
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The effects of thermal radiation on dry convection
… Rayleigh-Benard convection, except that thermal radiative transfer is included. This type of system can be investigated in the laboratory. The second type of model is a more faithful representation of the earth's atmosphere. In this model, the temperature at the upper boundary is left …
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Investigation of nanoscale thermal radiation : theory and experiments
… thermophotovoltaic energy conversion, narrowband thermal emitters, and camouflage in military applications. Thermal radiation at the nanometer scale is significantly different from classical or macroscopic radiative energy transport - wave effects, such as interference and diffraction, and …
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Heat Transfer Issues in Thin-Film Thermal Radiation Detectors
The Thermal Radiation Group at Virginia Polytechnic Institute and State University has been working closely with scientists and engineers at NASA's Langley Research Center to develop accurate analytical and numerical models suitable for designing next-generation thin-film thermal radiation …
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The Effect of High Transverse Electric Fields on Thermal Radiation
… A flared concentric cylinder blackbody radiation source has been constructed in which a large electric field can be applied to the emitting surfaces to determine if radiative heat transfer can be modified by applied electric fields. A Monte Carlo analysis of this cavity was performed to …
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Damage initiation in organic materials exposed to high-intensity thermal radiation
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1953.
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A Model For The Absorption Of Thermal Radiation By Gold-Black
… presented here addresses an important topic in thermal radiation detection when gold-black is used as an absorber. Sought is a model to simulate the absorption of thermal radiation by gold-black. Fractal geometry is created to simulate the topology of gold-black. Then electrical circuits based …
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A Numerical Investigation of Thermal Radiation Scattering From Configured and Random Surfaces
Thermal radiation scattering from one-dimensional and two-dimensional surfaces are presented. The surface profiles are configured or random rough with geometrical scales on the order of the wavelength. Scattered energy distributions from one-dimensional surfaces are restricted within the incidence …
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Experimental Design for Estimating Electro-Thermophysical Properties of a Thermopile Thermal Radiation Detector
… turn, rely on accurate measurements of the Earth Radiation Budget (ERB) in order to quantify changes in the atmosphere. The Thermal Radiation Group (TRG), a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, has been at the edge of …
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Experimental investigations on the influence of curvature and materials on near-field thermal radiation
The bimaterial cantilever based near-field thermal radiation measurement setup was an experimental breakthrough in the field of near-field thermal radiation. The setup distinguishes itself from other experimental configurations at that time by allowing a direct measurement of the near-field thermal …
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Dynamic Electrothermal Model of a Sputtered Thermopile Thermal Radiation Detector for Earth Radiation Budget Applications
… the Earth through a Cassegrain telescope. The Thermal Radiation Group, a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, is currently studying a new sensor concept to replace the current bolometer: a thermopile thermal radiation …
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Optical Analysis of a Linear-Array Thermal Radiation Detector for Geostationary Earth Radiation Budget Applications
The Thermal Radiation Group, a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, is currently working to develop a new technology for thermal radiation detectors. The Group is also studying the viability of replacing current Earth …
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Thermal radiation and slip effects on mhd stagnation point flow of nanofluid over a shrinking sheet
This study is conducted to analyze the effects of thermal radiation and slip effects on magnetohydrodynamic stagnation point flow over a shrinking sheet. The velocity, temperature, and nanoparticles concentration profiles are analyzed with respect to the involved parameters such as Lewis number, …
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Unsteady hydromagnetic chemically reacting mixed convection MHD flow over a permeable stretching sheet embedded in a porous medium with thermal radiation and heat source/sink
… sheet embedded in a porous medium with thermal radiation and heat source/sink is investigated numerically. The original partial di erential equations are converted into ordinary di erential equations by using similarity transformation. The governing non-linear partial di erential …
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Thermal and Optical Properties of Oxide Coatings for High-Temperature Applications
… several high-temperature applications to provide thermal insulation on account of their low thermal conductivity. However, many of them that are currently used, such as zirconia, mono- and disilicates, and zirconates, are translucent to thermal radiation up to 3 – 6 microns, the spectral range …
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A study of flow and heat transfer of nanofluids: between two parallel plates, over a wedge and past a stretching sheet
… flow is studied firstly in the presence of thermal radiation, and secondly, in the presence of both thermal radiation and heat generation/absorption. The solutions are obtained by using homotopy perturbation method (HPM) and fourth-order Runge-Kutta with shooting technique (RK4). The flow of …
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