Explicit solutions for Hele–Shaw corner flows

We consider two-dimensional bubbles in a corner flow in a Hele–Shaw cell of a viscous incompressible fluid that occupies the complement to a bubble. We discuss the governing equations, some basic properties of the free interface of the bubbles, their geometry, and construct explicit solutions that present asymmetric long bubbles analogous to the famous Saffman– Taylor fingers in a wedge of arbitrary angle (alpha) in (0,2(pi).