(241g) NON-Newtonian FLUID Effect on Effective Velocities in Electrical FIELD FLOW Fractionation

NON-NEWTONIAN FLUID EFFECT ON EFFECTIVE VELOCITIES IN ELECTRICAL FIELD FLOW FRACTIONATION

Stephen Dueck; Mario Oyanader

Chemical Engineering Department, California Baptist University, 8432 Magnolia Ave. Riverside, CA 92504, E-mail: moyanader@calbaptist.edu

In the area of electrical field flow fractionation (EFFF) several parameters have been investigated to optimize solute separation [Pascal, Oyanader and Arce, 2010]. Although, devices with a cylindrical geometry offer the perfect setting to analyze the effect of Couette flows in applications such as separation of pharmaceuticals and metabolites, the Non-Newtonian nature of the carrier fluid has not been fully investigated yet. The main focus of this contribution is to extend the knowledge and understanding of the carrier fluid effect on the optimal time of separation. Furthermore, the study concentrates on the comparison of the analytical solution using area averaging methodology for the Newtonian and Non-Newtonian cases. Several cases of pseudo-plastic and dilatant fluids are examined and its influence on the effective velocity profile. Especial attention is given to fact that traditional simplification of the cylindrical to a rectangular system does not facilitate the capturing of the Non-Newtonian behavior of fluid.