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Confinement effects in premelting dynamics
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2017 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 96, no 5, article id 052801Article in journal (Refereed) Published
Abstract [en]

We examine the effects of confinement on the dynamics of premelted films driven by thermomolecular pressure gradients. Our approach is to modify a well-studied setting in which the thermomolecular pressure gradient is driven by a temperature gradient parallel to an interfacially premelted elastic wall. The modification treats the increase in viscosity associated with the thinning of films, studied in a wide variety of materials, using a power law and we examine the consequent evolution of the confining elastic wall. We treat (1) a range of interactions that are known to underlie interfacial premelting and (2) a constant temperature gradient wherein the thermomolecular pressure gradient is a constant. The difference between the cases with and without the proximity effect arises in the volume flux of premelted liquid. The proximity effect increases the viscosity as the film thickness decreases thereby requiring the thermomolecular pressure driven flux to be accommodated at higher temperatures where the premelted film thickness is the largest. Implications for experiment and observations of frost heave are discussed.

Place, publisher, year, edition, pages
American Physical Society , 2017. Vol. 96, no 5, article id 052801
Keyword [en]
Film thickness, Films, Gas dynamics, Pressure, Pressure gradient, Temperature, Thermal gradients, Viscosity, Confinement effects, Constant temperature, Elastic walls, Frost heave, Pre-melting, Premelted films, Proximity effects, Thermomolecular pressure, Thermodynamics
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-227146DOI: 10.1103/PhysRevE.96.052801Scopus ID: 2-s2.0-85034013051OAI: oai:DiVA.org:kth-227146DiVA, id: diva2:1202981
Funder
Swedish Research Council
Note

QC 20180502

Available from: 2018-05-02 Created: 2018-05-02 Last updated: 2018-05-02Bibliographically approved

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Wettlaufer, John

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