Particle Deposition Mechanisms: Diffusion to a Cylinder

Direct Interception Limit

The capture efficiency then is given by

(21)

where

(22)

is the interception parameter.

Equations (20) and (21) are for the limiting conditions that the diffusion or the direct interception are dominant. They show that for fixed U and fiber diameter, the efficiency decreases with particle diameter d at first and then increases with further increase in d.