Motion of drops on a surface induced by thermal gradient and vibration

Srinivas Mettu, Manoj K. Chaudhury

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

It is well known that a liquid drop with a low contact angle (∼45°) and low wetting hysteresis moves toward the colder region of a temperature gradient substrate as a result of the thermal Marangoni force. A moderately sized water drop, however, usually does not move on such a surface because of the overwhelming effect of hysteresis. The water drop can, however, be forced to move when it is vibrated on a temperature gradient surface with its velocity exhibiting maxima at the respective Rayleigh frequencies. A simple model is presented that captures the dependence of drop velocity on hysteresis, vibration amplitude, and the forcing and resonance frequencies of vibration.

Original languageBritish English
Pages (from-to)10833-10837
Number of pages5
JournalLangmuir
Volume24
Issue number19
DOIs
StatePublished - 7 Oct 2008

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