Creeping Flow Past a Sphere

Oseen Drag for a Cylinder

 The creeping flow equation does not accept a solution for flow over a cylinder. The Oseen approximation, however, converges and leads to the following expression for the drag coefficient for a cylinder:

Here

Empirical Formula

For larger Reynolds number, the following empirical equations for spherical and cylindrical particles may be used:

Drag on a Droplet

The expression for the drag action on a droplet in Stokes flow region is given by

where