Multigradient Dielectrophoresis: Wire Grid Matrix Optimization and Current Modelization at High Loading

Abstract

The various processes for separation with electric fields are briefly recalled with emphasis on dielectrophoresis. For dielectrophoietic filtration in nonaqueous liquids, a wire matrix optimization study shows that wires must be as thin as possible to maximize forces and at a distance to radius ratio below 5 for the best use of the electrified space. A model is proposed for the variation of the electric current measured as particle buildup is progressing. Numerical calculations are reported demonstrating the importance of transient effects. It is also mentioned that a more sophisticated approach incorporating the nonlinear behavior of conductivity vs field intensity is adequate to take into account effects occurring at high field intensities. Finally, practical design considerations are presented.