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.
Results
Showing 1 to 20 of 124 for “"thermal conductivities"”.
-
ENGINEERING THERMAL CONDUCTIVITIES FOR ENERGY APPLICATIONS
… underscores the urgency for innovations in thermal management materials and structures. Thermal conductivity engineering stands at the forefront of these innovations, aiming to optimize the transfer or insulation of heat for various energy applications. This dissertation explores the …
-
Novel fibrillar carbon nanotube heat transfer gels with enhanced thermal conductivities
… billion on energy maintenance and increasing the thermal efficiency of HTFs by 25% could annually save over $20 billion. This study was aimed at improving the thermal conductivity (TC) of synthetic and vegetable oil heat transfer fluids (HTFs) by using Single-Walled Carbon Nanotubes (SWNTs) …
-
Determination of low-temperature thermal conductivities for several grades of oil shale
Includes bibliographical references (page 36).
-
Experimental study on subcooled flow boiling on heating surfaces with different thermal conductivities
… surface wettability but sharply different thermal properties, bubble dynamics displayed fairly similar behavior. The obtained experimental results indicate that thermal conductivity of heating surface material plays an important role in boiling heat transfer. This is due to thermal …
-
An improvement on Hering's method of measuring mean thermal conductivities of furnace electrodes
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrochemical Engineering, 1918.
-
Computational investigation of the thermal conductivities and phonon properties of strontium cobalt oxides
The thermal conductivities of electrochemically tuned strontium cobalt oxides (SCO) are significantly different among the perovskite SrCoO3 (P-SCO), the brownmillerite SrCoO2.5 (BM-SCO) and the hydrogenated HSrCoO2.5 (H-SCO)1. The underlying mechanism causing this large difference is still unclear. …
-
Preparation of silica aerogels with improved mechanical properties and extremely low thermal conductivities through modified sol-gel process
Reported silica aerogels have a thermal conductivity as low as 15 mW/mK. The fragility of silica aerogels, however, makes them impractical for structural applications. The purpose of the study is to improve the ductility of aerogels while retain the low thermal conductivity of silica aerogels. We …
-
Analysis of a space experimental design for high-Tc superconductive thermal bridges
… warmer amplification electronics act as thermal bridges and, consequently, the mission lifetimes of the satellites are limited due to cryogenic evaporation. High-temperature superconductor (HTS) materials have been proposed by researchers at the National Aeronautics and Space …
-
Characterization and Modeling of the Thermal Properties of Photopolymers for Material Jetting Processes
… parts with embedded electronics, but the thermal management of these assemblies is a potential issue. Electrical components have efficiency losses, and a significant portion of that lost energy is converted into heat. Embedding electronics in PolyJet parts is of particular interest since …
-
The effect of roughness element thermal conductivity on turbulent convection.
… occur over surfaces that exhibit roughness with thermal conductivities much lower than common metals and alloys. This is especially true of in-service gas turbine blades with surface depositions. Depending on the local convection coefficients, low thermal conductivity deposits may create …
-
Modeling of Thermal Transport Properties in Metallic and Oxide Fuels
Thermal conductivity is a critical fuel performance property not only for current UO2 oxide fuel based light water reactors but also important for next-generation fast reactors that use U-Zr based metallic fuels. In this work, the thermal transport properties of both UO2 based oxide fuels and U-Zr …
-
Observation and manipulation of the wave nature of phonon thermal transport through superlattices
… the importance of understanding nanoscale thermal transport has grown. In this thesis, we investigate thermal transport through superlattices (SLs), periodic layers of thin films, to better understand thermal conduction at these small scales. The classical picture of nanoscale thermal …
-
Ultra low thermal conductivity in layered disordered crystalline materials
… an alternative route to achieve ultralow thermal conductivity in a dense solid. Thin films of disordered layered crystalline materials were deposited using Modulated Elemental Reactants (MER) method. Cross-plane thermal conductivity was measured using Time-Domain Thermo Reflectance (TDTR) …
-
Thermal Characterization of Complex Aerospace Structures
… of complex structures exposed to harsh thermal environments is a crucial issue in many of today's aerospace and space designs. To predict the thermal stresses a structure might be exposed to, the thermal properties of the independent materials used in the design of the structure need to …
-
Well-log based determination of rock thermal conductivity in the North German Basin
In sedimentary basins, rock thermal conductivity can vary both laterally and vertically, thus altering the basin’s thermal structure locally and regionally. Knowledge of the thermal conductivity of geological formations and its spatial variations is essential, not only for quantifying basin …
-
Thermal Transport on the Nanometer Scale and the Effect of Microstructure and Interface Resistance
… of the physics of phonons involved in thermal transport on nanometer scale and to address the need for systematic information about the thermal properties of ultra-thin films. The present work includes data on thermal transport in dense and porous hydrogen silsesquioxane thin films and …
-
The scattering of thermal phonons by extended defects in dielectric crystals
The scattering of thermal phonons by extended defects in dielectric crystals has been observed through measurements of thermal conductivity and ballistic heat pulse propagation. The thermal conductivities of LiF and NaCt containing 500 low-angle grain boundaries per cm were measured in the range …
-
Thermal conductivity anisotropy in molybdenum disulfide thin films
… to the belief that MoS2 may exhibit ultralow thermal conductivity. Thermal conductivities were measured using the time-domain thermoreflectance method. MoS2 samples were prepared with different crystallographic orientations relative to the substrate by magnetron sputtering and …
-
Diamond-coated carbon fibres, the new generation of composites (CFRP)?
… is an anisotropic material. Their electrical and thermal conductivities as well as their mechanical properties perpendicular to the CFs are several orders of magnitude lower than in the longitudinal direction. This poses a safety problem for their use in aircraft structures. The main problem is …
Page 1 of 7