Non-Fourier phonon heat conduction at the microscale and nanoscale

The description of phonon heat conduction has typically been based on Fourier diffusion theory. However, over the past three decades, a host of interesting phonon transport phenomena beyond the Fourier diffusion picture have drawn much attention. Although most of the studies focused on classical siz...

Full description

Saved in:
Bibliographic Details
Published in:Nature reviews physics Vol. 3; no. 8; pp. 555 - 569
Main Author: Chen, Gang
Format: Journal Article
Language:English
Published: London Nature Publishing Group 01.08.2021
Subjects:
Anderson localization
Conduction heating
Conductive heat transfer
Conductivity
Diffusion theory
Electrical conduction
Heat conductivity
High temperature
Localization
Nanowires
Phonons
Size effects
Temperature
Thermal conductivity
Thin films
Transport phenomena
ISSN:2522-5820
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The description of phonon heat conduction has typically been based on Fourier diffusion theory. However, over the past three decades, a host of interesting phonon transport phenomena beyond the Fourier diffusion picture have drawn much attention. Although most of the studies focused on classical size effects that lead to reduced thermal conductivity, other phenomena have been observed, often at the microscale and nanoscale, that are either completely novel or appear only at elevated temperatures. Examples are the prediction and observation of phonon second sound at high temperatures, quantized heat conduction and Anderson localization. These developments reveal rich phonon heat conduction phenomena analogous to those of electrical conduction. This Review discusses different non-Fourier heat conduction regimes (including the Casimir–Knudsen classical size effect regime), phonon hydrodynamics, the coherent phonon transport regimes (including localization and quantization of heat conduction) and the possibility of divergent heat conduction in low dimensions.Phonon heat conduction at the microscale and the nanoscale exhibits rich phenomena beyond the predictions of Fourier’s law, rivalling the phenomena of electrons. This Review discusses phonon heat conduction regimes, including the Casimir–Knudsen size effect, hydrodynamic transport, coherent transport (from quantization and localization) and divergence.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:2522-5820
DOI:10.1038/s42254-021-00334-1