We simulate unsteady nanoscale thermal transport at a solid-fluid interface by placing cooler liquid-vapor Ar mixtures adjacent to warmer Fe walls. The equilibration of the system towards a uniform overall temperature is investigated using nonequilibrium molecular dynamics simulations from which the heat flux is also determined explicitly. The Ar–Fe intermolecular interactions induce the migration of fluid atoms into quasicrystalline interfacial layers adjacent to the walls, creating vacancies at the migration sites. This induces temperature discontinuities between the solidlike interfaces and their neighboring fluid molecules. The interfacial temperature difference and thus the heat flux decrease as the system equilibrates over time. The averaged interfacial thermal resistance decreases as the imposed wall temperature is increased, as . The simulated temperature evolution deviates from an analytical continuum solution due to the overall system heterogeneity.
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15 September 2008
Research Article|
September 22 2008
Unsteady nanoscale thermal transport across a solid-fluid interface
Ganesh Balasubramanian;
Ganesh Balasubramanian
Department of Engineering Science and Mechanics,
Virginia Polytechnic Institute and State University
, Blacksburg, Virginia 24061-0219, USA
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Soumik Banerjee;
Soumik Banerjee
Department of Engineering Science and Mechanics,
Virginia Polytechnic Institute and State University
, Blacksburg, Virginia 24061-0219, USA
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Ishwar K. Puri
Ishwar K. Puri
a)
Department of Engineering Science and Mechanics,
Virginia Polytechnic Institute and State University
, Blacksburg, Virginia 24061-0219, USA
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a)
Author to whom correspondence should be addressed. Present address: Virginia Tech Department of Engineering Science and Mechanics, 223 Norris Hall, Blacksburg, VA 24061. Tel.: +1-540-231-3243. FAX: +1-540-231-4574. Electronic mail: ikpuri@vt.edu.
J. Appl. Phys. 104, 064306 (2008)
Article history
Received:
April 12 2008
Accepted:
July 17 2008
Citation
Ganesh Balasubramanian, Soumik Banerjee, Ishwar K. Puri; Unsteady nanoscale thermal transport across a solid-fluid interface. J. Appl. Phys. 15 September 2008; 104 (6): 064306. https://doi.org/10.1063/1.2978245
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