Figure 5-48-C

Liquid split into merging filaments by a hole, and collapsing hole.

The contact angle on all surfaces is 40 degrees, so Concus-Finn filaments can form. The hole splits the liquid into two such filament, and the walls are low enough and the hole big enough that the liquid does not get dragged across the hole. But the walls are barely high enough that if you evolve far enough beyond the shown animation, the two filaments will merge beyond the hole. This animation extends the evolution far enough to see the merger and the hole collapse. If the walls were a little lower or the hole a little larger, then the catenoid would not collapse. These walls are 10% higher than in Movie_5_48_B. Note: The progress of the liquid has been bounded to keep the size of the graphics files down.