Figure 3-23-A

Liquid filament outside a curved wall.

The contact angle on all surfaces is 40 degrees, so Concus-Finn filaments can form. This model just has a filament along the inner curve of a curved channel (the vertical wall is not shown). Note that, unlike for a straight wall, the filament outside a curved wall does not expand arbitrarily high or wide. Rather it converges to a catenoid surface that makes the proper contact angles with the floor and wall.