Mixture segregation by an inertial cavitation bubble

Abstract : Pressure diffusion is a mass diffusion process forced by pressure gradients. It has the ability to segregate two species of a mixture, driving the densest species toward high pressure zones, but requires very large pressure gradients to become noticeable. An inertial cavitation bubble develops large pressure gradients in its vicinity, especially as the bubble rebounds at the end of its collapse, and it is therefore expected that a liquid mixture surrounding such a bubble would become segregated. Theory developed in an earlier paper shows that this is indeed the case for sufficiently large molecules or nano-particles. The main theoretical results are recalled and a possible implication of this segregation phenomenon on the well-known cavitation-enhanced crystals nucleation is proposed.
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R. Grossier, Olivier Louisnard, Y. Vargas. Mixture segregation by an inertial cavitation bubble. Ultrasonics Sonochemistry, Elsevier, 2007, 14 (4), pp.431-437. ⟨10.1016/j.ultsonch.2006.10.010⟩. ⟨hal-01717683⟩

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