The coalescence speed of a pendent and a sessile drop

  • Thoroddsen S
  • Takehara K
  • Etoh T
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When two liquid drops come into contact, they coalesce rapidly, owing to the large curvature and unbalanced surface-tension forces in the neck region. We use an ultrahigh- speed video camera to study the coalescence of a pendent and a sessile drop, over a range of drop sizes and liquid viscosities. For low viscosity, the outward motion of the liquid contact region is successfully described by a dynamic capillary-inertial model based on the local vertical spacing between the two drop surfaces. This model applies even when the drops are of different sizes. Increasing viscosity slows down the coalescence when the Reynolds number Rev =ρRaveσ/μ2

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  • S. T. Thoroddsen

  • K. Takehara

  • T. G. Etoh

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