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 126 for “"thermophysical"”.
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Thermophysical properties of glass and glass-ceramic composites
The thermal diffusivity and conductivity of several ceramic composites were determined experimentally to observe the effect of temperature, heat treatment and orientation on these properties. The thermal conductivity and diffusivity of SiC whisker reinforced Ba-osumilite glass-ceramic exceeded that …
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Applications of thermophysical characterization using the 3-omega technique
… concentrations in binary mixtures based on their thermophysical properties. This is demonstrated using two sensor geometries with sensitivities comparable to other electrothermal techniques, but with a lower power consumption. Using temperature dependent thermal conductivity of polymers, an …
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Effect of fabrication parameters on thermophysical properties of sintered wicks
Porous wicks for use in a loop heat pipe were sintered from copper and Monel powder. These wicks were characterized in terms of their shrinkage, porosity, thermal conductivity, liquid permeability and maximum capillary pressure. The effect of fabrication parameters (particle size and sintering …
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Evaluating Fluoride Molten Salt Thermophysical Properties with Transient Grating Spectroscopy
Accurate molten salt thermophysical properties are required to optimize the efficiency and safety of molten salt-based energy technologies. Unfortunately, existing thermal conductivity data for molten fluorides are plagued by large uncertainties. In addition, the data displays a curious positive …
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Thermophysical and Structural Measurements of Liquid Metallic Alloys Using Electrostatic Levitation
… techniques of data acquisition and analysis for thermophysical property measurements under electrostatic levitation are presented, with demonstrative examples from select compositions from the Cu-Zr system. The development of techniques and software for the analysis of X-ray diffraction data …
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The impact of thermophysical properties on nanofluid-based solar collector performance
… heat transfer fluids. They offer enhanced thermophysical, rheological and radiative properties. These enhancements have resulted in recent research being centred on the application of nanofluids to various systems. An example of such systems is the solar volumetric flow receiver in which …
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Thermophysical Properties and Microstructural Changes of Composite Materials at Elevated Temperature
Experimental methods were developed and used to quantify the behavior of composite materials during heating to support development of heat and mass transfer pyrolysis models. Methods were developed to measure specific heat capacity, kinetic parameters, microstructure changes, porosity, and …
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Linking Thermophysical Transitions and Rheological Properties to Polymer Foaming Outcomes with Carbon Dioxide
… for the fundamental understanding of polymer thermophysical and rheological properties in the presence of dense fluids. In particular, carbon dioxide is often studied as a physical blowing agent because of its readily accessible critical point (31.1 ℃ and 73.8 MPa) and relatively high …
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Experimental Design Optimization and Thermophysical Parameter Estimation of Composite Materials Using Genetic Algorithms
Thermophysical characterization of anisotropic composite materials is extremely important in the control of today fabrication processes and in the prediction of structure failure due to thermal stresses. Accuracy in the estimation of the thermal properties can be improved if the experiments are …
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Experimental Design for Estimating Electro-Thermophysical Properties of a Thermopile Thermal Radiation Detector
… technology using materials whose electro-thermophysical properties are not completely characterized. The objective of this investigation is to design experiments aimed at determining the electro-thermophysical properties of the detector materials. These properties are the thermal …
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Li₂0₂ in Li-0₂ batteries : catalytic enhancement of electrochemical oxidation and thermophysical transformations
Electrification of transportation in the United States is of importance in reducing dependence on foreign oil and curtailing global warming. However, optimal market penetration of electric vehicles is confronted with the prohibitive cost and limited energy capacity of current state of the art …
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Evaluation Of Thermophysical Properties, Friction Factor And Heat Transfer Of Alumina Nanofluid Flow In Tubes
<p>Various thermophysical properties, fluid flow parameter and heat transfer characteristics were measured for nanofluid with 6% volume concentration of solid Al2O3 nanoparticles in water. Thermal conductivity measurements showed that there is a definite enhancement in thermal conductivity of the …
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Formulation & Thermophysical Analysis of a Beeswax Microemulsion & The Experimental Calculation of its Heat Transfer Coefficient
… of a beeswax microemulsion, the analysis of its thermophysical properties, and the experimental method to calculate its heat transfer coefficient under laminar flow conditions. First, the beeswax microemulsion was formulated to possess both a low viscosity to enhance pumpability, as well as a …
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Enabling extreme fast charging systems in electric vehicles through thermal management and thermophysical property characterization
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Modeling and Characterization of Structural, Thermophysical, and Dynamical Evolutions of Small Bodies in the Solar System
… asteroids, focusing on their structural, thermophysical, and dynamical evolutions to provide a more comprehensive view of their life cycle. Asteroids exhibit a remarkable diversity of shapes, reflecting their complex evolutionary pathways. This dissertation begins by exploring their …
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Exploring water-in-oil emulsions for immersion cooling: thermophysical properties, electrical insulation, and chip-level performance
This thesis experimentally evaluates Span 80–stabilized water-in-oil (W/O) emulsions, prepared from Crystal Plus Oil 70T with 2.5–20 vol% water, as immersion coolants for natural-convection cooling of high-power electronics. Conventional dielectric oils provide good insulation but low thermal …
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Selection of Prediction Methods for Thermophysical Properties for Process Modeling and Product Design of Biodiesel Manufacturing
… it is essential to know the four fundamental thermophysical properties of the feed oil: liquid density (Ï L), vapor pressure (Pvap), liquid heat capacity (CpL), and heat of vaporization (Î Hvap). Additionally, to characterize the fuel qualities, it is critical to develop quantitative …
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Issues on Clean Diesel Combustion Technology Using Supercritical Fluids: Thermophysical Properties and Thermal Stability of Diesel Fuel
<p>The clean diesel combustion technology using supercritical fluids is aimed to both improve fuel economy and reduce harmful emissions. This novel process involves preparation, injection and combustion of supercritical fuel/diluents mixtures. Design and development of this new process require a …
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Thermophysical and Thermochemical Property Measurement and Prediction of Liquid Metal Titanium Alloys with Applications in Additive Manufacturing
Accurate high-temperature thermophysical property data for liquid metals and alloys are important for simulation of laser-based 3D printing processes. To understand and better control such additive manufacturing processes, knowledge of density, viscosity, and surface tension of liquid metals and …
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