Abstract
The kinetics of a spreading drop is usually controlled by conversion of capillary potential energy into viscous dissipation within the liquid when the solid is rigid. However, if the solid is sufficiently sot, a «wetting ridge» near the solid/liquid/vapor triple line can also be a dissipative sink as the wetting front moves. In this paper we provide evidence to show that when the substrate is soft, this local deformation near the triple line may lead to an energy dissipation that may outweigh effects due to viscosity over a large range of speeds and therefore spreading kinetics becomes viscosity independent
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