MOMENTUM-TRANSFER AT THE BOUNDARY BETWEEN A POROUS-MEDIUM AND A HOMOGENEOUS FLUID .2. COMPARISON WITH EXPERIMENT

In Part I of this paper a stress jump condition was developed based on the non-local form of the volume averaged Stokes' equations. The excess stress terms that appeared in the jump condition were represented in a manner that led to a tangential stress boundary condition containing a single adjustable coefficient of order one. In this paper we compare the theory with the experimental studies of Beavers and Joseph [J. Fluid Mech. 30, 197-207 (1967)], and we explore the use of a variable porosity model as a substitute for the jump condition. The latter approach does not lead to a successful representation of all the experimental data, but it does provide some insight into the complexities of the boundary region between a porous medium and a homogeneous fluid.