Thermal heat transport characterization for macroscale, microscale, and nanoscale heat conduction

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Thermal heat transport characterization for macroscale, microscale, and nanoscale heat conduction

Authors

Anderson, Christianne Vanessa Duim Riberiro

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2008-12

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Abstract

Several theoretical and experimental methods for predicting the thermal conductivity of thin dielectric ¯lms and carbon nanotubes are presented based on two schools of thought: (1) the physics of the Boltzmann Transport Equation (BTE), and (2) Molec- ular Dynamics (MD) simulations. First, in relation to models based on the BTE, this thesis highlights temporal and spatial scale issues by looking at a uni¯ed theory that bridges physical aspects presented in the Fourier and Cattaneo models. This newly developed uni¯ed model is the so called C- and F-Processes heat conduction model. The model introduces the dimensionless heat conduction model number which is the ratio of thermal conductivity of the fast heat carrier F-Processes to the total thermal conductivity comprised of both fast F-processes and slow heat carrier C-processes. Prior work has claimed that macroscopic heat transfer models cannot explain mi- croscale heat transfer. First, this dissertation provides arguments by showing how the C-F model is able to extend the use of \macroscopic" constitutive relations for the prediction of thermal conductivity at the \microscopic" level for thin ¯lms, mul- tilayer structures, and includes both dielectrics and metals. Second, the in°uence of external mechanical strain on the thermal conductivity of single-wall carbon nan- otubes is studied using direct molecular dynamics simulations with Terso®-Brenner potential for C-C interactions. Three types of external mechanical strain, namely, axial compression, tension, and torsion are studied. In all three cases, the thermal conductivity does not degrade much, i.e., it remains within 10% of the pristine nan- otube values for lower applied strain below the values required for structural collapse. At higher applied strain, structural collapse occurs, and major reductions in the ob- served thermal conductivity for axially compressed and torsionally twisted tubes are observed.

Keywords

Boltzmann Transport Equation

Heat Conduction

Microscale

Molecular Dynamics

Superlattices

Thin Films

Mechanical Engineering

Description

University of Minnesota Ph.D. dissertation. December 2008. Major: Mechanical engineering. Advisor: Kumar K. Tamma. 1 computer file (PDF); iii, 281 pages. Includes illustrations.

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Anderson, Christianne Vanessa Duim Riberiro. (2008). Thermal heat transport characterization for macroscale, microscale, and nanoscale heat conduction. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/46904.

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