| Influence of substrate conductivity on circulation reversal in evaporating drops. | |
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MedLine Citation:
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PMID: 18233371 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Nonuniform evaporation from sessile droplets induces radial convection within the drop, which produces the well-known "coffee-ring" effect. The evaporation also induces a gradient in temperature and consequently a gradient in surface tension, generating a Marangoni flow. Here we investigate theoretically and experimentally the thermal Marangoni flow and establish criteria to gauge its influence. An asymptotic analysis indicates that the direction of the flow depends on the relative thermal conductivities of the substrate and liquid, k_{R} identical withk_{S}/k_{L}, reversing direction at a critical contact angle over the range 1.45<k_{R}<2. We corroborate the theory experimentally and demonstrate that the Marangoni flow can significantly influence the resulting patterns of particle deposition. |
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Authors:
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W D Ristenpart; P G Kim; C Domingues; J Wan; H A Stone |
Publication Detail:
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Type: Journal Article Date: 2007-12-03 |
Journal Detail:
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Title: Physical review letters Volume: 99 ISSN: 0031-9007 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2007 Dec |
Date Detail:
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Created Date: 2008-01-31 Completed Date: 2008-05-01 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 234502 Citation Subset: - |
Affiliation:
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School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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