In this paper, we study theoretically the phonon thermal conductivity of nanocomposites with nanowires embedded in a host semiconductor material using the phonon Boltzmann equation. Special attention is paid for using periodic boundary conditions. The simulation shows that the temperature profiles in nanocomposites are very different from those in regular composites, due to ballistic phonon transport at nanoscale. Such temperature profiles cannot be captured by exiting models in literature. We predict the thermal conductivity dependence on the size of the nanowires, the volume fraction, and the bulk properties of the constituent materials. Comparison is also made with the thermal conductivity of superlattices. Results of this study can be used to direct the development of high efficiency thermoelectric materials.
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ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
July 11–15, 2004
Charlotte, North Carolina, USA
Conference Sponsors:
- Heat Transfer Division and Fluids Engineering Division
ISBN:
0-7918-4693-8
PROCEEDINGS PAPER
Thermal Conductivity Prediction of Periodic Nanocomposites Using Phonon Boltzmann Equation
Ronggui Yang,
Ronggui Yang
Massachusetts Institute of Technology, Cambridge, MA
Search for other works by this author on:
Gang Chen
Gang Chen
Massachusetts Institute of Technology, Cambridge, MA
Search for other works by this author on:
Ronggui Yang
Massachusetts Institute of Technology, Cambridge, MA
Gang Chen
Massachusetts Institute of Technology, Cambridge, MA
Paper No:
HT-FED2004-56460, pp. 449-456; 8 pages
Published Online:
February 24, 2009
Citation
Yang, R, & Chen, G. "Thermal Conductivity Prediction of Periodic Nanocomposites Using Phonon Boltzmann Equation." Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. Volume 4. Charlotte, North Carolina, USA. July 11–15, 2004. pp. 449-456. ASME. https://doi.org/10.1115/HT-FED2004-56460
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