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Title: Disparate quasiballistic heat conduction regimes from periodic heat sources on a substrate

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4893299· OSTI ID:1385309
 [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering

Here we report disparate quasiballistic heat conduction trends for periodic nanoscale line heaters deposited on a substrate, depending upon whether measurements are based on the peak temperature of the heaters or the temperature difference between the peak and the valley of two neighboring heaters. The degree of quasiballistic transport is characterized by the effective thermal conductivities of the substrate which are obtained by matching the diffusion solutions to the phonon Boltzmann transport equation results. We find that while the ballistic heat conduction effect based on the peak temperature diminishes as the two heaters become closer, it becomes stronger based on the peak-valley temperature difference. Our results also show that the collective behavior of closely spaced heaters can counteract the nonlocal effects caused by an isolated nanoscale hot spot. These results are relevant to thermal conductivity spectroscopy techniques under development and also have important implications for understanding nonlocal heat conduction in integrated circuits and carbon nanotube array thermal interface materials

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001299; FG02-09ER46577
OSTI ID:
1385309
Journal Information:
Journal of Applied Physics, Vol. 116, Issue 6; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (10)

Spectral mapping of thermal conductivity through nanoscale ballistic transport journal June 2015
Measuring Phonon Mean Free Path Distributions by Probing Quasiballistic Phonon Transport in Grating Nanostructures journal November 2015
Coupling enhanced growth by nitrogen and hydrogen plasma of carbon nanotubes journal January 2019
Monte Carlo study of non-diffusive relaxation of a transient thermal grating in thin membranes journal February 2016
Achieving high power factor and output power density in p-type half-Heuslers Nb 1-x Ti x FeSb journal November 2016
Advances in Studying Phonon Mean Free Path Dependent Contributions to Thermal Conductivity journal May 2015
Monte Carlo prediction of ballistic effect on phonon transport in silicon in the presence of small localized heat source journal July 2019
Extending the range of validity of Fourier's law into the kinetic transport regime via asymptotic solution of the phonon Boltzmann transport equation text January 2015
Monte Carlo Study of Non-diffusive Relaxation of A Transient Thermal Grating in Thin Membranes text January 2015
Losses in plasmonics: from mitigating energy dissipation to embracing loss-enabled functionalities text January 2018

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