CROSS-FLOW FILTRATION OF MACHINING FLUIDS BY MICROFILTRATION MEMBRANES (INFLUENCE OF CHIP SIZE ON PERMEATION FLUX)

Recent developments in the precision grinding technology of advanced c eramics have been remarkable. However, ceramic chips floating in grind ing fluids cause scratches on the surface being ground, deteriorating the surface finish. Ceramic chips are extremely hard, fine, nonmagneti c substances and their shape is relatively particulate with low specif ic gravity. Therefore, the removal of these chips by the conventional filtration system becomes very difficult. In this study, the experimen tal. and theoretical analyses of the cross-flow microfiltration of gri nding fluids were examined and the effect of the turbulence promoter o n the permeation flux was clarified. The effects of the blockage ratio of the turbulence promoter and feed concentration on the permeation f lux and solute rejection, respectively, were examined. A filtration mo del based on the lateral migration theory was proposed. The calculated results agree qualitatively with the experimental results and the ade quacy of this model was confirmed.