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Convective Rolls and Hydrothermal Waves in Evaporating Sessile Drops

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)11433-11439
Number of pages7
JournalLangmuir
Volume28
Issue number31
DOIs
Publication statusPublished - 7 Aug 2012

Abstract

Recent experiments on the evaporation of sessile droplets have revealed the spontaneous formation of various patterns including the presence of hydrothermal waves. These waves had previously been observed, in the absence of evaporation, in thin liquid layers subjected to an imposed, uniform temperature gradient. This is in contrast to the evaporating droplet case wherein these gradients arise naturally due to evaporation and are spatially and temporally varying. In the present paper, we present a theory of evaporating sessile droplets deposited on a heated surface and propose a candidate mechanism for the observed pattern formation using a linear stability analysis in the quasi-steady-state approximation. A qualitative agreement with experimental trends is observed.

ID: 4577092