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Molecular Dynamics Prediction of the Thermal Resistance of Solid-Solid Interfaces in Superlattices

[+] Author Affiliations
A. J. H. McGaughey

Carnegie Mellon University

J. Li

Ohio State University

Paper No. IMECE2006-13590, pp. 317-325; 9 pages
doi:10.1115/IMECE2006-13590
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 1
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4784-5 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

Molecular dynamics simulations are used to predict the thermal resistance of solid-solid interfaces in crystalline superlattices using a new Green-Kubo formula. The materials on both sides of the interfaces studied are modeled with the Lennard-Jones potential and are only differentiated by their masses. To obtain the interface thermal resistance, a correlation length in the bulk materials is first predicted, which approaches a system-size independent value for larger systems. The interface thermal resistance is found to initially increase as the layer length is increased, and then to decrease as the phonon transport shifts from a regime dominated by ballistic transport to one dominated by diffusive transport.

Copyright © 2006 by ASME

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