Journal
LANGMUIR
Volume 35, Issue 25, Pages 8191-8198Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b04157
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Funding
- NSF [CMMI-1405109, CBET-1428398, CBET-0960229]
- Lady Davis Foundation
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We have investigated the retention forces of liquid drops on rotating, vertical surfaces. We considered two scenarios: in one, a horizontal, centrifugal force pushes the drop toward the surface (pushed drop case), and in the other, a horizontal, centrifugal force pulls the drop away from the surface (pulled drop case). Both drops slide down as the centrifugal force increases, although one expects that the pushed drop should remain stuck to the surface. Even more surprising, when the centrifugal force is low, the pushed drop moves faster than the pulled drop, but when the centrifugal force is high, the pushed drop moves much slower than the pulled drop. We explain these results in terms of interfacial modulus between the drop and the surface.
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