ABSTRACT
Generally, the flow to an unfiltered exit and the flow within a matrix of particles as it is the case with contact erosion orwith suffusion, have to be distinguished. In the second case, the matrix of the coarse particles has an impact on the transport process to some extent, either to partially hinder the particle transport by influencing the particles drag force or by limiting the flow and thus, the hydraulic load. Considering the flow to an unfiltered exit, the inclination of the plane surface and the angle of the flow lines against this surface have to be regarded.
