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 62 for “"Thermal conduction"”.
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Thermal conduction in microelectronic circuits
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Design, Fabrication And Testing Of A Shape Memory Alloy Based Cryogenic Thermal Conduction Switch
… this work is to develop an SMA based cryogenic thermal conduction switch for operation between dewars of liquid methane and liquid oxygen in a common bulk head arrangement for NASA. The design of the thermal conduction switch is based on a biased, two-way SMA actuator and utilizes a commercially …
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SUPPRESSION OF ELECTRON THERMAL CONDUCTION IN THE HIGH β INTRACLUSTER MEDIUM OF GALAXY CLUSTERS
… of the plasma transport processes, especially thermal conduction. The basic physics of thermal conduction in plasmas with ICM-like conditions has yet to be elucidated, however. We use particle-in-cell simulations and analytic models to explore the dynamics of an ICM-like plasma (with small …
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Exploring middle school students' sensemaking of a gesture-augmented computer simulation depicting thermal conduction
… to develop a causal-mechanistic explanation of thermal conduction through a silver spoon. The computer simulation is a dynamic molecular model of a spoon that depicts the causal-mechanism of the spoon’s molecules moving to explain how heat transfer occurs. Moreover, it is augmented with …
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Transport modeling of simple fluids and nano-colloids : thermal conduction mechanisms and coarse projection
… dynamics (MD) simulations. The intrinsic thermal conductivity is decomposed into self and cross correlations of the three modes that make up the microscopic heat flux vector, namely, the kinetic, the potential and the virial. By this decomposition analysis, the interplay between the …
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Investigating temperature distributions and thermal conduction effects in laser-heated plasmas relevant to Magnetized Liner Inertial Fusion
… Te(r,z) profiles show that, by inhibiting thermal conduction in the radial direction, the applied magnetic field increased Te, the axial extent of the laser heating, and the magnitude of the radial temperature gradients. Furthermore, temperature gradient scale lengths extracted from the …
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Multi-dimensional simulations of bow shocks of massive, high-velocity runaway stars
… in 2- and 3-dimensions, while including thermal conduction and detailed radiative cooling/heating. Extensive 3D freely expanding stellar wind models testing the numerics in PLUTO, e.g., grid geometries, solvers, limiters and convergence with resolution are presented. Further 2D adiabatic, …
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Engineering design criteria for high temperature thermoelectric generation based on molten compounds
… Seebeck coefficient, electrical conductivity, thermal conductivity and, for the first time, the Figure of Merit and TE conversion efficiency of a molten semiconductor at the device level. The heat transfer modes of molten SnS in the TE test cell is investigated. The results suggest a domination …
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Synthesis and characterization of high thermal conductive polymers and fabrication of polymer based thermal strap
… traditional polymers are both electrically and thermally insulating, due to its organic nature and amorphous structures. In the late 20th century, electrically conductive polymers has been discovered. Thermally conductive polymers, however, were not demonstrated until the recent decades. …
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A detailed view of filaments and sheets of the warm-hot intergalactic medium
… cooling, heating due to an UV background, thermal conduction, and the effect of small-scale perturbations given by the cosmological power spectrum. We use a set of simulations, parametrized by the wave length of the initial perturbation L. For L ~ 2 Mpc/h the collapse leads to …
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An analysis of reconnection dynamics in an eruptive flare model
… ribbons.</p><p>In the third part, we integrate thermal conduction into the Somov-Titov framework using a slow-shock model that includes conduction, and allows us to describe the thermal halo that surrounds the current sheet because of heat flow across the current sheet boundary. We find that …
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Aspetti innovativi per la valutazione e la misura della porosità nei materiali dell'edilizia antica e moderna. La geometria frattale della porosità
… the expressions for the permeability and the thermal conduction which does not require empirical “constants”, these expressions have also provided values that are generally in agreement with the experimental available data. More problematic has been the fractal discussion of the geometry of …
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Thermal transport in graphene-based nanostructures and other two-dimensional materials
Heat conduction in nanomaterials is an important area of study, with both fundamental and technological implications. However, little is known about heat flow in two-dimensional (2D) materials or devices with dimensions comparable to the phonon mean free path (MFP). Here, we investigated thermal …
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Bridging conduction and radiation : investigating thermal transport in nanoscale gaps
… nanometers, the distinction between classical thermal conduction and thermal radiation become blurred. Contact thermal conduction is understood through the means of interfacial transport of phonons, whereas thermal radiation is understood by the exchange of heat through the electromagnetic …
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X and Ultraviolet Radiation From Accreting Non-Magnetic Degenerate Dwarfs: A Two-Fluid Treatment of the Emission Region and the Effects of Steady Nuclear Burning
… the ions to differ and which^include electron thermal conduction. The calculation is done in spherical^geometry, with cooling by bremsstrahlung and cooling by the inverse^Compton effect added in the post shock emission region. Our two-fluid^calculations are needed only in the small region …
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Simultaneous packing and routing optimization of thermal-fluid systems
… in current methods for routing optimization. A thermal conduction finite element model based on geometric projection is presented. Pressure drop of the fluid in the routing is modeled with a lumped parameter pipe flow model. A parameterization is developed that allows the use of gradient based …
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Infrasound Propagation in Terrestrial Planetary Atmospheres
… which includes gravity, molecular viscosity, and thermal conduction, has been developed using numerical solutions in Fortran, and is validated for the atmospheric conditions of Earth, Mars, and Venus. Empirical profiles for these planets are provided by the NASA Global Reference Atmospheric Model …
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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 …
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Molecular dynamics analysis of spectral characteristics of phonon heat conduction in silicon
… technological significance of silicon, its heat conduction mechanisms have been studied extensively. However, there have been some lingering questions surrounding the phonon mean free path and importance of different polarizations. This research investigates phonon transport in bulk crystalline …
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Numerical models for scoring failures of flexible metal to metal face seals
… deflections, lubrication in the sealing band and thermal effects simultaneously. The numerical models were validated from comparisons with experiments and applied to scoring failure tests. The new scoring failure criterion successfully predicted the likelihood of scoring failures for each seal …
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