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 81 for “"thermophysical properties"”.
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Thermophysical properties of glass and glass-ceramic composites
… heat treatment and orientation on these properties. The thermal conductivity and diffusivity of SiC whisker reinforced Ba-osumilite glass-ceramic exceeded that of SiC fiber reinforced osumilite due to higher thermal conductivity and diffusivity of the whiskers. An anisotropy was observed …
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Effect of fabrication parameters on thermophysical properties of sintered wicks
… size and sintering conditions) on these properties was studied. Shrinkage was found to increase with increasing sintering time and temperature. Porosity followed the opposite trend. For a given sintering temperature, thermal conductivity of the samples was found to increase as the …
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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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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 techniques were used to measure the properties of composite construction materials commonly used in naval applications: E-glass vinyl ester laminates and end-grain balsa wood core. The simultaneous DSC/TGA was used to measure the apparent specific heat required to heat the decomposing …
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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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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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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
… new process require a deep understanding of fuel properties. The current study has attempted to address three fuel property related issues: fuel surrogates, diffusivity and thermal stability.</p> <p>Fuel surrogates are often used in engine research to mimic real fuel properties. In this work, ten …
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Determination of the Raman Spectra of Molten ZnCl2 and Thermophysical Properties of Polymerized C60 Solids Using Atomistic Computational Techniques
… techniques for characterizing the vibrational properties of two distinct material-systems, namely molten ZnCl_2 and polymerized C_60 solids, and thus gain new knowledge on their structure and thermophysical properties respectively. In the first study, ab initio methods were used to interpret …
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Carbon Dioxide-Lubricant Two-Phase Flow Patterns in Small Horizontal Wetted Wall Channels: The Effects of Refrigerant/lubricant Thermophysical Properties
… inside 0.5 mm tubes. A new flow map based on the thermophysical properties of the flowing fluid has been developed to account for the viscous and interfacial tensions effects on two-phase flows in channels below the criteria for interfacial tension affected flows.
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The role of an assist gas during laser-metal interaction
… the effect of change in absorptivity and other thermophysical properties associated with oxide formation during laser-metal interaction.
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ΕΦΑΡΜΟΓΗ ΤΩΝ ΑΡΧΩΝ ΜΕΤΑΦΟΡΑΣ ΜΑΖΑΣ ΚΑΙ ΘΕΡΜΟΤΗΤΑΣ ΣΤΗΝ ΞΗΡΑΝΣΗ ΤΡΟΦΙΜΩΝ
… A FUNDAMENTAL PART OF THE DRYING OPERATION. THE THERMOPHYSICAL PROPERTIES OF RAISINS AND THE HEAT AND MASS TRANSFER COEFFICIENTS, REQUIRED FOR THE SOLUTION, WERE MEASURED EXPERIMENTALLY FOR SULTANA GRAPES, USING DRYING EXPERIMENTS. FINALLY, BASED ON THIS MODEL, AN INDUSTRIAL DRYER FOR SULTANA …
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Fire modeling for cook-off in ordnance magazines
… a heat transfer model based on the geometry and thermophysical properties of a new concept for a vertical launching system, the Concentric Canister Launcher (CCL). Different fire scenarios are analyzed by the model to predict the time it takes to reach a critical value or 'cook-off' temperature …
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Thermal analysis of the internal climate condition of a house using a computational model
… governing equations that describe the thermal properties inside of a simple house. The geometries and thermophysical properties of the model were altered to simulate changes in the building envelope design to determine how these changes affect the internal thermal climate for both summer and …
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Molecular Modeling Of Energetic Materials And Chemical Warfare Agents
… is proposed as a theoretical tool to determine thermophysical properties that aid in understanding how certain energetic materials behave in the environment and developing techniques for detecting chemical warfare agents. Molecular modeling is a promising alternative to experiments due to the …
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Study on specifics of thermalhydraulics and neutronics of pressure-channel supercritical water-cooled reactors (SCWRs)
… heat transfer coefficient, which is affected by thermophysical properties of supercritical water, axial heat flux, and three heat-transfer regimes: normal, improved and deteriorated; 2) thermophysical properties, which are affected by the bulk-fluid-temperature profile along the heated length and …
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Improving seawater desalination and seawater desalination brine management
… in several ways. For the first time, the thermophysical properties of seawater have been characterized as a function of pressure across the full desalination operating regimes of temperature, salinity and pressure. Functions that allow accurate thermodynamic least work of desalination and …
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