PARTICLE DEPOSITION ONTO A PERMEABLE SURFACE IN LAMINAR-FLOW

A theoretical investigation of particle deposition onto a permeable su rface in a parallel-plate channel is presented in this paper. The conv ective diffusion equation is rigorously formulated with the inclusion of lateral transport due to permeation drag and inertial lift, and tra nsport due to gravitational, double layer, and van der Waals forces. A numerical procedure for solving the governing equation is also presen ted. The effects of particle size, permeation velocity, solution ionic strength, cross-flow velocity, and particle density on the initial ra te of particle deposition are investigated. Results point out that the local and average particle deposition rates onto a permeable surface are determined by an interplay between several transport and interacti on mechanisms, among which permeation drag, electric double layer repu lsion, and inertial lift are most important. (C) 1995 Academic Press, Inc.