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Media type:
E-Article
Title:
Marangoni convection in droplets on superhydrophobic surfaces
Contributor:
TAM, DANIEL;
von ARNIM, VOLKMAR;
McKINLEY, G. H.;
HOSOI, A. E.
imprint:
Cambridge University Press (CUP), 2009
Published in:
Journal of Fluid Mechanics, 624 (2009), Seite 101-123
Language:
English
DOI:
10.1017/s0022112008005053
ISSN:
0022-1120;
1469-7645
Origination:
Footnote:
Description:
<jats:p>We consider a small droplet of water sitting on top of a heated superhydrophobic surface. A toroidal convection pattern develops in which fluid is observed to rise along the surface of the spherical droplet and to accelerate downwards in the interior towards the liquid/solid contact point. The internal dynamics arise due to the presence of a vertical temperature gradient; this leads to a gradient in surface tension which in turn drives fluid away from the contact point along the interface. We develop a solution to this thermocapillary-driven Marangoni flow analytically in terms of streamfunctions. Quantitative comparisons between analytical and experimental results, as well as effective heat transfer coefficients, are presented.</jats:p>