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PhononGap SIGNED

Heat transfer and friction between two closely spaced objects due to phonon transfer across a vacuum gap

Total Cost €

EC-Contrib. €

Partnership

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Outcomes and
results

PhononGap project word cloud

Explore the words cloud of the PhononGap project. It provides you a very rough idea of what is the project "PhononGap" about.

unlike estimate van force waals phonons friction photons fundamental conduction vibrations first vacuum closely situations separated spaced exchange shifted momentum small transporting origin bodies unable energy theory transmit leaving sources traverse mediated micro frictional spacing surfaces likewise heat photon industry electromechanical transfer der considering doppler exist collective mechanism interaction dominant forces radiation objects understand ing question atomic dominate confirmed form mode transport experimental source single transmitting gap quantified quantify solids explains effect

Project "PhononGap" data sheet

The following table provides information about the project.

Coordinator	IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE Organization address address: SOUTH KENSINGTON CAMPUS EXHIBITION ROAD city: LONDON postcode: SW7 2AZ website: http://www.imperial.ac.uk/ contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.
Coordinator Country	United Kingdom [UK]
Total cost	183˙454 €
EC max contribution	183˙454 € (100%)
Programme	1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
Code Call	H2020-MSCA-IF-2015
Funding Scheme	MSCA-IF-EF-ST
Starting year	2016
Duration (year-month-day)	from 2016-04-01 to 2018-03-31

Partnership

Take a look of project's partnership.

#	participants	country	role	EC contrib. [€]
1	IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE Organization address address: SOUTH KENSINGTON CAMPUS EXHIBITION ROAD city: LONDON postcode: SW7 2AZ website: http://www.imperial.ac.uk/ contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.	UK (LONDON)	coordinator	183˙454.00

Map

Project objective

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 solids (via phonons) is dominant compared to the radiation mode of heat transport (via 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 it has been recognized that a mechanism could exist where phonons can transport heat across a vacuum gap - through Van der Waals interaction between two closely separated bodies. Important recent experimental measurements have indeed confirmed that photon-mediated heat transport cannot be the only source of heat transport between two objects with small spacing, thus leaving open a fundamental question over what other sources of heat transport can exist. The first aim of this project is to theoretically estimate the heat transport mediated by phonons transmitting across a vacuum gap via the Van der Waals force.

Closely spaced bodies can not only exchange energy resulting in heat transfer but also momentum which results in frictional forces. There is no one single theory that explains the origin of friction; indeed there can be many sources. Considering the importance of friction, especially to the micro-electromechanical industry, it is important that each of the sources is identified and quantified, and the situations when each mechanism can dominate is understood. One known form of friction is Van der Waals friction where photon exchange between surfaces result in friction due to the Doppler effect. Likewise it is possible for Doppler-shifted phonons to contribute to friction when they transmit across a vacuum gap via the Van der Waals forces. The second aim of this project is to quantify this source of friction and understand when it can dominate.

Publications

List of publications.
year	authors and title	journal	last update
2017	K. Sasihithlu, J.B. Pendry, R.V. Craster Van der Waals Force Assisted Heat Transfer published pages: , ISSN: 0932-0784, DOI: 10.1515/zna-2016-0361	Zeitschrift fÃ¼r Naturforschung A 72/2	2019-06-13
2017	Karthik Sasihithlu, Girish Agarwal Coupled harmonic oscillator description for modeling the surface mode contribution to the dynamic heat transfer between vacuum separated planar surfaces published pages: , ISSN: , DOI:	arXiv preprint	2019-06-13
2016	J. B. Pendry, K. Sasihithlu, R. V. Craster Phonon-assisted heat transfer between vacuum-separated surfaces published pages: 10, ISSN: 2469-9950, DOI: 10.1103/PhysRevB.94.075414	Physical Review B 94/7	2019-06-13

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The information about "PHONONGAP" are provided by the European Opendata Portal: CORDIS opendata.