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Water colliding with oil

Published online by Cambridge University Press:  29 June 2012

David Quéré*
Physique et Mécanique des Milieux Hétérogènes, ESPCI, 75005 Paris, France and Departments of Mechanics and Physics, École polytechnique, 91120 Palaiseau, France
Email address for correspondence:
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The collision of two liquid drops is both an applied question (in rain formation or combustion, for example) and a beautiful basic situation, where impact involves liquid phases, making this problem worth studying in its own right. In a stimulating paper, Planchette, Lorenceau & Brenn (J. Fluid Mech., this issue, vol. 702, 2012, pp. 5–25) consider collisions between oil and water, which often lead to water drops protected by a shell of oil. By looking at the deformations during impact, they characterize the dynamical conditions leading to single encapsulation, and derive a criterion for avoiding fragmentation.

Focus on Fluids
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