Mass Transfer to the Rear of a Sphere in Stokes Flow

Boundary-layer methods typically break down at the rear of a bluff object. There are a few cases where this phenomenon can be elucidated. In these cases, the failure of the boundary-layer methods is confined to a small region behind the object, and this region becomes smaller as the Péclet number or the Reynolds number increases. Mass transfer at high Schmidt numbers to a sphere in Stokes flow is an example of such a case [1].