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dc.contributor.authorXu, Xinpeng
dc.contributor.authorQian, Tiezheng
dc.date.accessioned2015-05-14T12:41:32Z
dc.date.available2015-05-14T12:41:32Z
dc.date.issued2012-06-26
dc.identifier.citationThermal singularity and droplet motion in one-component fluids on solid substrates with thermal gradients 2012, 85 (6) Physical Review E
dc.identifier.issn1539-3755
dc.identifier.issn1550-2376
dc.identifier.doi10.1103/PhysRevE.85.061603
dc.identifier.urihttp://hdl.handle.net/10754/552870
dc.description.abstractUsing a continuum model capable of describing the one-component liquid-gas hydrodynamics down to the contact line scale, we carry out numerical simulation and physical analysis for the droplet motion driven by thermal singularity. For liquid droplets in one-component fluids on heated or cooled substrates, the liquid-gas interface is nearly isothermal. Consequently, a thermal singularity occurs at the contact line and the Marangoni effect due to temperature gradient is suppressed. Through evaporation or condensation in the vicinity of the contact line, the thermal singularity makes the contact angle increase with the increasing substrate temperature. This effect on the contact angle can be used to move the droplets on substrates with thermal gradients. Our numerical results for this kind of droplet motion are explained by a simple fluid dynamical model at the droplet length scale. Since the mechanism for droplet motion is based on the change of contact angle, a separation of length scales is exhibited through a comparison between the droplet motion induced by a wettability gradient and that by a thermal gradient. It is shown that the flow field at the droplet length scale is independent of the statics or dynamics at the contact line scale.
dc.publisherAmerican Physical Society (APS)
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevE.85.061603
dc.rightsArchived with thanks to Physical Review E
dc.titleThermal singularity and droplet motion in one-component fluids on solid substrates with thermal gradients
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalPhysical Review E
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionNano Science and Technology (NSNT) Program, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
dc.contributor.institutionDepartment of Mathematics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
kaust.personQian, Tiezheng
kaust.grant.fundedcenterKAUST-HKUST Micro/Nanofluidic Joint Laboratory
refterms.dateFOA2018-06-13T16:56:21Z


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