Atomistic evidence of hydrodynamic heat transfer in nanowires
Desmarchelier, Paul (Université de Lyon)
Beardo Ricol, Albert (Universitat Autònoma de Barcelona. Departament de Física)
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física)
Tanguy, Anne (Université de Lyon)
Termentzidis, Konstantinos (Université de Lyon)

Date:	2022
Abstract:	With wave-packet propagation simulations and heat flux estimation via molecular dynamics, we show that the heat flux radial distribution in silicon nanowires can be described by a mesoscopic model, the hydrodynamic heat equation. We observe Poiseuille like heat flux profile, that cannot be described by a simple kinetic model such as the Fuchs-Sondheimer model, in both pristine and core/shell nanowires. The addition of a shell does not change the shape of the radial heat flux distribution, but just modifies the maximum of the heat flux in the center of the nanowire. These results show that there is a heat flux depletion length for pristine or core shell nanowires, 1-2 nm away from the boundary of the crystalline part. The parameters of the mesoscopic model are discussed in terms of microscopic properties, including the phonon mean free path as function of frequency and the partial vibrational density of states in the different regions of the nanowire.
Grants:	Agencia Estatal de Investigación RTI2018-097876-B-C22
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Published in:	International journal of heat and mass transfer, Vol. 194 (September 2022) , art. 123003, ISSN 1879-2189

DOI: 10.1016/j.ijheatmasstransfer.2022.123003

Postprint 41 p, 6.2 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Grup de Propietats de Transport a la Nanoescala
Articles > Research articles
Articles > Published articles