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 28 for “"Specific heat capacity"”.
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End-of-life analysis of nanotechnology products
… properties including melting point and specific heat capacity of nanomaterials may be higher than that of their corresponding bulk materials. The melting point elevation and specific heat capacity enhancement of nanomaterials may result in increased energy consumption and waste gases …
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In-situ Study of Single Pharmaceutical Granule Drying using Synchrotron X-ray Imaging
… and porosity on the thermal conductivity and specific heat capacity of the pharmaceutical materials. A transient line heat source method was used, with relationships established between thermal conductivity and the volumetric specific heat capacity with porosity and moisture content for the …
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Characterization of thermal dissipation within integrated gate bipolar transistor (IGBT) layered packaging structure
… output power and generate significant amounts of heat, which needs to be removed from the chip to ensure continued operation. Since IGBT chips are commonly mounted on a layered assembly structure which is in turn mounted onto a heat sink assembly, the thermal dissipation properties of the layered …
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Modification of Ternary Nitrate Mixture's Thermal Properties
… use in a concentrated solar power system as a heat transfer fluid (HTF) or thermal energy storage (TES) material. The properties that were investigated were latent heat, average specific heat capacity and rate of heat flow. The study reviews the changes during heating and cooling cycles and …
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Thermal Performance Modeling of a Novel Dual-PCM Evacuated U-Tube Solar Collector
Solar water heating (SWH) systems are a well-established and eco-friendly way to generate hot water for household or commercial applications as it utilizes energy from solar radiation which is readily available all year round. However, there are drawbacks to this technology especially during times …
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Heating of solid matter via laser generated electrons
This thesis reports on numerical studies of the heating of solid targets via laser generated fast electron beams, which allows for better understanding and optimisation of the generation of hot dense matter in a laboratory setting. The work is split into 3 main investigations which are summarised …
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The potential of porcelain waste as sand replacement to produce high strength concrete
… flexural strength and thermal conductivity, specific heat capacity, thermal diffusivity. The physical properties examined are porosity, water absorption and density. The chemical composition of PW material was completed by using X-ray fluorescence (XRF) technique. The distribution of …
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The impact of thermophysical properties on nanofluid-based solar collector performance
Nanofluids are a novel class of heat transfer fluids in which nanoparticles are dispersed in traditional 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 …
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Effect of temperature-dependent ice properties on ice shell convection for icy ocean worlds
… we find that including temperature dependent specific heat capacity decreases the energy stored in the conductive lid. Thus, the timescale for ice shell response to thermal perturbations is reduced by approximately one third. An ice shell that is more sensitive to thermal perturbations may …
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Thermal Property Determination Using Optimization of One-side Known Radiant Exposure
… to solve for the thermal conductivity and specific heat capacity, the thermal properties of composite materials can be determined. These thermal properties can then be used in a rapid heat damage assessment and failure prediction tool that can be updated based on additional data provided …
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Mechanical and Thermal Properties of Linear Carbon Chains Encapsulated by Multi- and Double -Walled Carbon Nanotubes
… thermal properties of molecular systems. More specifically, pressure (P) and temperature (T)-dependent Raman spectroscopy allowed us to access elusive mechanical (Young’s modulus (E), Grüneisen parameter (γ), and mechanical strain (ε)) and thermal properties (coefficient of thermal expansion …
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Design and Simulation of Passive Thermal Management System for Lithium-Ion Battery Packs on an Unmanned Ground Vehicle
… ground vehicle was simulated with ANSYS Fluent. Heat generation rates and specific heat capacity of a single cell were experimentally measured and used as input to the thermal model. A heat generation load was applied to each battery and natural convection film boundary conditions were applied to …
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An environmental analysis of injection molding
… or all-electric) has a substantial impact on the specific energy consumption (SEC), energy used per kg of processed polymer. The SEC values for hydraulic, hybrid and all-electric machines analyzed are 19.0, 13.2 and 12.6 MJ/kg respectively (including auxiliaries, compounding and the inefficiency …
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Simultaneous nanothermal analysis using heated microcantilevers
… thermal analysis applications performed with a heated microcantilever. Heated microcantilevers have low thermal mass, resulting in high heating rates with quick response times, and are relative isolated to major heat losses, making them well suited for nanothermal analysis. This work discusses …
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Thermophysical Properties and Microstructural Changes of Composite Materials at Elevated Temperature
… 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 permeability. Specific heat and gravimetric data for …
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Study of Thermoelectric and Lattice Dynamics Properties of 2D Layered MX (M = Sn, Pb; X = S, Se, Te) and ZrS2 Compounds using First-principles Approach
… parameters: group velocity, phonon lifetime, and specific heat capacity. In addition, I also studied the structural stability, electronic, and magnetic properties of transition-metal (Mn, Fe, and Co) atoms adsorbed SnX (X = S, Se, and Te) MLs. In these investigations, the antiferromagnetic …
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Impact of Thermal Effects and Other Material Properties on the Performance and Electro-Thermal Reliability of Resistive Random Access Memory Arrays
… a significant concern surrounding ReRAMs—specifically, their electro-thermal reliability. This research provides evidence highlighting the critical influence of material properties, deposition effects, and thermal transport on the device's performance and reliability. Various material …
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Molten Salt Nanomaterials for Thermal Energy Storage and Concentrated Solar Power Applications
… on mixing with nanoparticles. For example the specific heat capacity of these molten salt eutectics was found to be enhanced by as much as ~ 26 percent on mixing with nanoparticles at a mass fraction of ~ 1 percent. The resultant properties of these nanomaterials were found to be highly …
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Microencapsulated phase change materials for thermal energy storage: development, evaluation, and application
… increasing interest lately for potential use in heat transfer and thermal energy storage (TES) applications due to their high energy storage density. The major obstacle limiting more widespread application of PCMs is containment of the liquid phase to prevent leakage and migration. To eliminate …
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The application of high temperature superconducting materials to power switches
… systems can be achieved using a co-wound heater that is powered by a capacitor discharge. Switches that have fast thermal diffusion times through the insulation can be modelled as a lumped system whereas those with slow thermal diffusion times were modelled with the full heat diffusion …
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