Author(s)

Malcolm R. Davidson

Abstract

Axisymmetric spreading of an idealised inviscid liquid drop impinging on a horizontal solid surface is analysed (including surface tension) using a Boundary Integral Method for selected Weber numbers ( We — 10, 20, 50, 100 based on initial drop radius and impact velocity). Progressive accumula- tion of liquid in a rim around the periphery of the spreading inviscid drop is predicted except when We = 100 for which no such rim is predicted. It is concluded that the experimentally observed rim is due solely to viscous retardation at this higher Weber number. The calculated reduction in drop height with time is found to be almost independent of Weber number, and agrees extremely well with experimental data despite the absence of viscous effe

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