Abstract
Some features of the viscous flow pattern in an annular sector with clearance are derived from Couette-Poiseuille flow.
The resultant equations can predict such important characteristics as the location of the center, the circulation flow rate of the vortex flow and so on as functions of the net flow rate through the clearance.
The predicted features of the viscous flow pattern are confirmed by the experimental results presented by Trommelen and Beek.
