Cited by 283Thermal properties of materialsThermoelastic and Magnetoelastic PhenomenaThermal Radiation and Cooling Technologies

Mean free path spectra as a tool to understand thermal conductivity in bulk and nanostructures

Yang, Fan, Dames, Chris·2013·Physical Review B

Abstract

A rigorous derivation is given for the thermal conductivity accumulation function and mean free path (MFP) spectrum of an isotropic bulk material. The key physical insight is to express the kinetic theory integral in terms of MFP rather than frequency. Extending this framework to incorporate boundary scattering in nanostructures leads to an integral equation that transforms a material's bulk MFP spectrum into the size-dependent thermal conductivity of the nanostructure. The kernel of this transform represents the boundary scattering rule for the particular type of nanostructure. The principal benefit of this transform is that it requires only a single function, the material's bulk MFP spectrum, or equivalently its accumulation function. Explicit knowledge of the material's dispersion relation and frequency-dependent bulk MFPs is not needed, nor is a summation over polarizations, because the bulk MFP spectrum already contains this information in exactly the form required to evaluate boundary scattering. The utility of this framework is demonstrated through a case study of six models for the phonon thermal conductivity of silicon: three analytical, one gray, and two numerical.

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Crossref · 10.1103/physrevb.87.035437

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Authors
Yang, F., & Dames, C.
Affiliations
University of California, Berkeley (US)
Venue
Physical Review B
Published
2013-01-31
Volume
87
Issue
3
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W2328394108
Cited by
283
References
54
Citations by year
2026: 13 · 2025: 20 · 2024: 13 · 2023: 18 · 2022: 18 · 2021: 23 · 2020: 17 · 2019: 21 · 2018: 23 · 2017: 32 · 2016: 34 · 2015: 27 · 2014: 14 · 2013: 10
FWCI
12.78
Type
journal article
Language
en
Open access
closed
Locations
Physical Review B (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Engineering › Mechanics of Materials › Thermoelastic and Magnetoelastic Phenomena
  • Physical Sciences › Engineering › Civil and Structural Engineering › Thermal Radiation and Cooling Technologies
Keywords
lattice thermal conductivity, boundary scattering, nanostructures, size-dependent thermal conductivity, silicon, phonon dispersion

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