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Journal Articles Physics of Fluids Year : 2013

Inertial coalescence of droplets on a partially wetting substrate

Abstract

We consider the growth rate of the height of the connecting bridge in rapid surface-tension-driven coalescence of two identical droplets attached on a partially wetting substrate. For a wide range of contact angle values, the height of the bridge grows with time following a power law with a universal exponent of 2/3, up to a threshold time, beyond which a 1/2 exponent results, that is known for coalescence of freely-suspended droplets. In a narrow range of contact angle values close to 90◦, this threshold time rapidly vanishes and a 1/2 exponent results for a 90◦ contact angle. The argument is confirmed by three-dimensional numerical simulations based on a diffuse interface method with adaptive mesh refinement and a volume-of-fluid method.
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Dates and versions

hal-00919847 , version 1 (17-12-2013)

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Yi Sui, Marco Maglio, Peter D. M. Spelt, Dominique Legendre, Hang Ding. Inertial coalescence of droplets on a partially wetting substrate. Physics of Fluids, 2013, 25, pp.1-7, 101701. ⟨10.1063/1.4824108⟩. ⟨hal-00919847⟩
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