EFFECTS OF AXIAL AND ORTHOGONAL APPLIED ELECTRIC-FIELDS ON SOLUTE TRANSPORT IN POISEUILLE FLOWS - AN AREA AVERAGING APPROACH

The effects of axial and normal applied electrical fields on the trans port of solutes in Poiseuille flows is investigated using the area ave rage approach to the microscopic conservation equations. The averaged solute species continuity equation features an effective dispersion co efficient and an effective velocity that arise due to the applied elec tric fields, and that are functions of the electric field parameters. The three specific cases considered in this paper include (1) a single field applied parallel to the fluid flow, (2) a single field applied perpendicular to the flow, and (3) one field applied parallel to the f low and an additional field applied perpendicular to the flow. This an alysis can be used to describe the transport of dilute noninteracting solutes in such separations as capillary electrophoresis with secondar y fields and field flow fractionation with coaxial and perpendicular e lectric fields, and in electrostatic aerosol classifiers.