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Detergency in a tube

Abstract : We study the motion of a drop of oil inside a capillary tube induced by a gradient of surfactant concentration. We first show that the wetting condition selects whether the drop moves towards or away from the surfactant. We then focus on the non-wetting case, for which the drop eventually escapes from the tube, and explore the different dynamics of propulsion. On a long time scale, we observe two regimes: either the drop reaches a constant velocity, or it moves intermittently, by successive jumps and stops. As a paradoxical consequence, viscous drops can be as mobile or even faster than inviscid ones. © 2011 The Royal Society of Chemistry.
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Submitted on : Wednesday, June 4, 2014 - 10:33:34 PM
Last modification on : Friday, August 5, 2022 - 11:54:11 AM



Keyvan Piroird, Christophe Clanet, David Quéré. Detergency in a tube. Soft Matter, 2011, 7 (16), pp.7498-7503. ⟨10.1039/c1sm05282a⟩. ⟨hal-00997972⟩



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