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Thermal Conductivity Prediction of Periodic Nanocomposites Using Phonon Boltzmann Equation

[+] Author Affiliations
Ronggui Yang, Gang Chen

Massachusetts Institute of Technology, Cambridge, MA

Paper No. HT-FED2004-56460, pp. 449-456; 8 pages
doi:10.1115/HT-FED2004-56460
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 4
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4693-8 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

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.

Copyright © 2004 by ASME

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