Heat dissipation in the quasiballistic regime studied using the Boltzmann equation in the spatial frequency domain
Abstract
Quasiballistic heat conduction, in which some phonons propagate ballistically over a thermal gradient, has recently become of intense interest. Most works report that the thermal resistance associated with nanoscale heat sources is far larger than predicted by Fourier's law; however, recent experiments show that in certain cases the difference is negligible despite the heaters being far smaller than phonon mean-free paths. In this work, we examine how thermal resistance depends on the heater geometry using analytical solutions of the Boltzmann equation. We show that the spatial frequencies of the heater pattern play the key role in setting the thermal resistance rather than any single geometric parameter, and that for many geometries the thermal resistance in the quasiballistic regime is no different than the Fourier prediction. We further demonstrate that the spectral distribution of the heat source also plays a major role in the resulting transport, unlike in the diffusion regime. Our work provides an intuitive link between the heater geometry, spectral heating distribution, and the effective thermal resistance in the quasiballistic regime, a finding that could impact strategies for thermal management in electronics and other applications.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1427638
- Alternate Identifier(s):
- OSTI ID: 1416419
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 1; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 97 MATHEMATICS AND COMPUTING; Phonons; thermal conductivity; transport phenomena; Boltzmann theory
Citation Formats
Hua, Chengyun, and Minnich, Austin J. Heat dissipation in the quasiballistic regime studied using the Boltzmann equation in the spatial frequency domain. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.014307.
Hua, Chengyun, & Minnich, Austin J. Heat dissipation in the quasiballistic regime studied using the Boltzmann equation in the spatial frequency domain. United States. https://doi.org/10.1103/PhysRevB.97.014307
Hua, Chengyun, and Minnich, Austin J. Wed .
"Heat dissipation in the quasiballistic regime studied using the Boltzmann equation in the spatial frequency domain". United States. https://doi.org/10.1103/PhysRevB.97.014307. https://www.osti.gov/servlets/purl/1427638.
@article{osti_1427638,
title = {Heat dissipation in the quasiballistic regime studied using the Boltzmann equation in the spatial frequency domain},
author = {Hua, Chengyun and Minnich, Austin J.},
abstractNote = {Quasiballistic heat conduction, in which some phonons propagate ballistically over a thermal gradient, has recently become of intense interest. Most works report that the thermal resistance associated with nanoscale heat sources is far larger than predicted by Fourier's law; however, recent experiments show that in certain cases the difference is negligible despite the heaters being far smaller than phonon mean-free paths. In this work, we examine how thermal resistance depends on the heater geometry using analytical solutions of the Boltzmann equation. We show that the spatial frequencies of the heater pattern play the key role in setting the thermal resistance rather than any single geometric parameter, and that for many geometries the thermal resistance in the quasiballistic regime is no different than the Fourier prediction. We further demonstrate that the spectral distribution of the heat source also plays a major role in the resulting transport, unlike in the diffusion regime. Our work provides an intuitive link between the heater geometry, spectral heating distribution, and the effective thermal resistance in the quasiballistic regime, a finding that could impact strategies for thermal management in electronics and other applications.},
doi = {10.1103/PhysRevB.97.014307},
journal = {Physical Review B},
number = 1,
volume = 97,
place = {United States},
year = {Wed Jan 10 00:00:00 EST 2018},
month = {Wed Jan 10 00:00:00 EST 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
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Figures / Tables found in this record: