The dynamics of evaporating sessile droplets |
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Authors: | G Guena C Poulard A -M Cazabat |
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Institution: | (1) Laboratoire de Physique Statistique de l’Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris Cedex 05, France |
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Abstract: | Experiments on sessile drops evaporating in a normal atmosphere without an applied thermal gradient are reported and compared
with an available theoretical model. The liquids used are alkanes; water; and, more recently, polydimethylsiloxane oligomers.
The substrates are silicon wafers, completely wetted by the liquid. Experiments with hanging drops allow us first to discard
any influence of convection in the gas phase on the drop dynamics. The model assumes the process to be controlled by the stationary
diffusion of the evaporating molecules in the gas phase. For alkanes and water, and in a limited range of drop sizes where
gravity can be ignored, the model accounts very well for the dynamics of the drop radius, and rather well for the contact
angle. This is no longer the case with the polydimethylsiloxane oligomers, where the very small contact angles require a more
elaborated analysis of the drop edge.
The text was submitted by the authors in English. |
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