Van der Waals Force Assisted Heat Transfer

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Title: Van der Waals Force Assisted Heat Transfer
Authors: Sasihithlu, K
Pendry, JB
Craster, RV
Item Type: Journal Article
Abstract: Phonons (collective atomic vibrations in solids) are more effective in transporting heat than photons. This is the reason why the conduction mode of heat transport in nonmetals (mediated by phonons) is dominant compared to the radiation mode of heat transport (mediated by photons). However, since phonons are unable to traverse a vacuum gap (unlike photons), it is commonly believed that two bodies separated by a gap cannot exchange heat via phonons. Recently, a mechanism was proposed [J. B. Pendry, K. Sasihithlu, and R. V. Craster, Phys. Rev. B 94, 075414 (2016)] by which phonons can transport heat across a vacuum gap – through the Van der Waals interaction between two bodies with gap less than the wavelength of light. Such heat transfer mechanisms are highly relevant for heating (and cooling) of nanostructures; the heating of the flying heads in magnetic storage disks is a case in point. Here, the theoretical derivation for modelling phonon transmission is revisited and extended to the case of two bodies made of different materials separated by a vacuum gap. Magnitudes of phonon transmission, and hence the heat transfer, for commonly used materials in the micro- and nano-electromechanical industry are calculated and compared with the calculation of conduction heat transfer through air for small gaps as well as the heat transfer calculation due to photon exchange.
Issue Date: 11-Jan-2017
Date of Acceptance: 29-Nov-2016
ISSN: 0932-0784
Publisher: Verlag der Zeitschrift Fuer Naturforschung
Start Page: 181
End Page: 188
Journal / Book Title: Zeitschrift für Naturforschung - Section A Journal of Physical Sciences
Volume: 72
Issue: 2
Copyright Statement: Sasihithlu, K., Pendry, J. & Craster, R. (2017). Van der Waals Force Assisted Heat Transfer. Zeitschrift für Naturforschung A, 72(2), pp. 181-188. Retrieved 18 Sep. 2017, from doi:10.1515/zna-2016-0361
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/L024926/1
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Multidisciplinary
Near-Field Heat Transfer
Van der Waals Force
0201 Astronomical And Space Sciences
0306 Physical Chemistry (Incl. Structural)
General Physics
Publication Status: Published
Appears in Collections:Condensed Matter Theory
Applied Mathematics and Mathematical Physics

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