Inertial coalescence of droplets on a partially wetting substrate | Zendy

Yi Sui | Zendy; Marco Maglio | Zendy; Peter Spelt | Zendy; Dominique Legendre | Zendy; Hang Ding | Zendy

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Inertial coalescence of droplets on a partially wetting substrate

Author(s) -

Yi Sui,

Marco Maglio,

Peter Spelt,

Dominique Legendre,

Hang Ding

Publication year - 2013

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.4824108

Subject(s) - coalescence (physics) , wetting , physics , exponent , contact angle , surface tension , mechanics , power law , wetting transition , volume of fluid method , classical mechanics , thermodynamics , breakup , linguistics , philosophy , statistics , mathematics , astrobiology

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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