POSTSUBSCRIPT with an error of 1 mm and 1 sec respectively. We use customary video with a body frequency of 30 frames per second. In determine 2, we show a sequence of how the sleek dimple evolves in time to change into cusp-like. POSTSUBSCRIPT the interface undergoes a topological transition in a fashion analogous to the pinch-off of a viscous thread. As the liquid drains, the liquid-air interface dimples above the drain gap. Notice the transition from a smooth dimple in determine 2a to a pointy interface in figure 2b. In determine 2c the free floor enters the opening. Begins to entrain a thread of air. The bottom of the cusp is much beneath the bottom of the container. POSTSUBSCRIPT measured from the underside floor of the container. That is checked by trying at the video body just earlier than some air bubbles start nucleating on the dimple’s apex. As the level of the liquid falls in the course of the liquid drainage, the dimple turns into sharper.
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