ABSTRACT An improved method of removal of fine particles suspended in nonaqueous media by the application of a high-voltage electric field was previous developed. However, to better understand the cross-flow electrofliter for future design improvements, a mathematical analysis of the filter was performed and more experiments were conducted with filter tubes of several porositites. Experiments were conducted with α-Al203, particles suspended in tetralin. Outlet concentrations of the concentrated slurry were measured with a gamma ray densitometer. A description of the flow field in the cross-flow electrofilter was obtained by solving the Navier-Stokes equations for annular flow with suction through an outer porous wall. A perturbation solution for the flow field was then used in a mathematical model which describes the concentration distribution in the electro filter. Numerical solutions were obtained by using the Crank-Nicholson finite difference method. Clear boundary layers near the filter wall were calc...