429319 Taylor Dispersion in Electrofocusing at Steady-State

Wednesday, November 11, 2015: 9:45 AM
Ballroom E (Salt Palace Convention Center)
Cornelius F. Ivory, Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA

The Aris-Taylor formulation for the dispersion coefficient should not be applied to electrophoretic separations where solutes are focused to a steady-state.  Analytic expressions and numerical calculations for dispersion coefficients will be presented for several types of separations where a steady-state or pseudosteady-state exist. In the simplest case where a solute is focused against a linear gradient in a restoring force, dispersion is controlled by two dimensionless groups, a Peclet number, Pe, which characterizes the magnitude of the parabolic component of the flow, and a gradient number, Gf, which depends on the magnitude of the slope of the restoring force. Following a brief summary of the analytic expressions for dispersion in mathematically linear separations, this talk will discuss the nature of dispersion in nonlinear electrophoretic systems.

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