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Communication Dans Un Congrès Année : 2021

Active volatile drops on liquid baths

Benjamin Reichert
Jean-Benoit Le Cam
Giuseppe Pucci

Résumé

In most experimental studies, active drops propel in a liquid bulk due to self-generated interfacial stresses of solutal origin. Here, we demonstrate the self-propulsion of a volatile drop on the surface of a liquid bath due to stresses of thermal origin. Evaporative heat pumping is converted into directed motion driven by thermocapillary stresses, which emerge on the drop surface as a result of a symmetry breaking of the drop temperature field. The dependence of the drop speed on the activity source, i.e. the evaporation flux, is derived with scaling arguments and captures the experimental data.

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hal-03341577 , version 1 (11-09-2021)

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Benjamin Reichert, Arnaud Saint-Jalmes, Jean-Benoit Le Cam, Giuseppe Pucci. Active volatile drops on liquid baths. 17es Journées de la Matière Condensée, Aug 2021, Rennes, France. ⟨hal-03341577⟩
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