Abstract
We report experiments observing the gravitational axisymmetric spreading of a viscous liquid with a fixed volume on inclined geometries that cause converging flows, for example, on a funnel and a bowl. The spreading of the liquid on these geometries is different from that on typical geometries such as an inclined plate: the thickness of the spreading front first decreases in time and then increases. These geometries also induce different new thresholds of fingering instabilities.
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