Figure 3
From: Unravelling colloid filter cake motions in membrane cleaning procedures
(a) Cake removal by cross-flow flushing without permeation reveals a pattern appearing on the microgel filter cake, which depends on the average cross-flow velocity ū. The cross-flow of the bulk is directed into the image-plane parallel to the pattern. The membrane position is indicated with a grey dashed line and the images are taken in the moment of pattern appearance after the time lag. (b) The pattern appears with a time lag after starting the cross-flow that depends on the cross-flow velocity (black). The cake removal time after first pattern appearance depends on the cross-flow velocity (grey). (c) The peak-to-peak distance in the first moment of pattern appearance depends on the cross-flow only for small velocities.
