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Self-Propulsion of a Volatile Drop on the Surface of an Immiscible Liquid Bath

Abstract : We demonstrate the self-propulsion of a volatile drop on the surface of a bath of an immiscible liquid. Evaporative heat pumping is converted into directed motion through thermocapillary stresses, which arise from the coupling between surface-tension-driven flows and temperature advection. A propulsive force arises from convection-sustained temperature gradients along the drop interface, resulting in a warmer pool of liquid being advected by the hydrodynamic flow in the underlying bath toward the back of the drop. 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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https://hal.archives-ouvertes.fr/hal-03357608
Contributor : Arnaud Saint-Jalmes Connect in order to contact the contributor
Submitted on : Friday, October 15, 2021 - 5:09:48 PM
Last modification on : Friday, October 15, 2021 - 5:13:59 PM

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Benjamin Reichert, Jean-Benoît Le Cam, Arnaud Saint-Jalmes, Giuseppe Pucci. Self-Propulsion of a Volatile Drop on the Surface of an Immiscible Liquid Bath. Physical Review Letters, American Physical Society, 2021, 127 (14), pp.144501. ⟨10.1103/PhysRevLett.127.144501⟩. ⟨hal-03357608⟩

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