Drag coefficients of variously shaped solid particles, drops, and bubbles

This article, which is largely a review, deals with the drag force and drag coefficient for rigid spherical and deformable particles in ordinary and non-Newtonian fluids. The most important theoretical formulas for small Reynolds numbers of Re a parts per thousand(a) 1 and semiempirical formulas for the drag coefficient in a wide Re range up to 10(6) are presented. The deformation of drops and bubbles and its effect on the drag coefficient are considered.