Rotating disk dynamic filtration devices are notorious for yielding very high permeate fluxes with particulate suspensions due to the very high shear they generate at the membrane. This paper investigates the gain in performance obtained by equipping the rotating disk with straight vanes of various heights using baker yeast suspensions as a test fluid. The presence of vanes raises the velocity factor k (ratio of angular velocity of inviscid fluid core between disk and membrane to disk angular velocity omega) from 0.45 for a flat or smooth disk to 0.65 for a disk with eight 2 mm high vanes, and to 0.84 for eight 6 mm vanes. This produces a large increase in wall shear stress which is proportional to (komega)(1.8). The permeate flux was found to be approximately proportional to komega for both 2 and 6 mm vanes and to about (komega)(0.864) for a smooth disk. But the increase in permeate flux obtained when adding vanes or increasing vane height is larger than that due to increase in k. This further increase is possibly due to increase mixing by vortices generated by the vanes which further decrease the cell layer thickness on the membrane. The electrical power necessary for driving these disks was measured and compared with the calculated mechanical power of friction forces. The mechanical efficiency was found to be the same for 2 and 6 mm vanes but less than for a smooth disk. However, due to the large permeate flux increase in presence of vanes, the specific energy per cubic meter of permeate was found to be the smallest with 6 mm vanes and highest with the smooth disk. The permeate flux increase resulting from higher mixing was shown to be responsible for the lower specific energy of the 6 mm vanes.