Fully Developed Flow in a Permeable Annulus

Abstract

In a recent paper, Das [1] considered the slow steady flow of a viscous fluid in an annulus with uniform, small, but arbitrary, injection and suction velocities along the walls. The purpose of this Note is to show how to obtain the general fully developed solution for a permeable annulus. It is shown how this solution reduces, when the injection or suction is small, to that given by Das and a few comments are made on Das’ paper.