dorsal/arxiv
View SchemaCoarse-grained description of thermo-capillary flow
| Authors | David Jasnow, Jorge Vinals |
|---|---|
| Categories | |
| ArXiv ID | patt-sol/9601004 |
| URL | https://arxiv.org/abs/patt-sol/9601004 |
| DOI | 10.1063/1.868851 |
| Journal | Phys. Fluids 8, 660 (1996) |
Abstract
A mesoscopic or coarse-grained approach is presented to study thermo-capillary induced flows. An order parameter representation of a two-phase binary fluid is used in which the interfacial region separating the phases naturally occupies a transition zone of small width. The order parameter satisfies the Cahn-Hilliard equation with advective transport. A modified Navier-Stokes equation that incorporates an explicit coupling to the order parameter field governs fluid flow. It reduces, in the limit of an infinitely thin interface, to the Navier-Stokes equation within the bulk phases and to two interfacial forces: a normal capillary force proportional to the surface tension and the mean curvature of the surface, and a tangential force proportional to the tangential derivative of the surface tension. The method is illustrated in two cases: thermo-capillary migration of drops and phase separation via spinodal decomposition, both in an externally imposed temperature gradient.
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"abstract": "A mesoscopic or coarse-grained approach is presented to study\nthermo-capillary induced flows. An order parameter representation of a\ntwo-phase binary fluid is used in which the interfacial region separating the\nphases naturally occupies a transition zone of small width. The order parameter\nsatisfies the Cahn-Hilliard equation with advective transport. A modified\nNavier-Stokes equation that incorporates an explicit coupling to the order\nparameter field governs fluid flow. It reduces, in the limit of an infinitely\nthin interface, to the Navier-Stokes equation within the bulk phases and to two\ninterfacial forces: a normal capillary force proportional to the surface\ntension and the mean curvature of the surface, and a tangential force\nproportional to the tangential derivative of the surface tension. The method is\nillustrated in two cases: thermo-capillary migration of drops and phase\nseparation via spinodal decomposition, both in an externally imposed\ntemperature gradient.",
"arxiv_id": "patt-sol/9601004",
"authors": [
"David Jasnow",
"Jorge Vinals"
],
"categories": [
"patt-sol",
"nlin.PS"
],
"doi": "10.1063/1.868851",
"journal_ref": "Phys. Fluids 8, 660 (1996)",
"title": "Coarse-grained description of thermo-capillary flow",
"url": "https://arxiv.org/abs/patt-sol/9601004"
},
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