A high-order (h/p type) spectral element method is developed, and verified for numerical simulation of combined electroosmotic and pressure driven flows in complex microgeometries. Analytical relations for wall shear stress, velocity and pressure distributions in straight channels are obtained. The electrokinetic pumping action is demonstrated. Electroosmotic flows in groove-channels, microchannel junctions and Y-split junctions are analyzed. Precise flow adjustment and separation control techniques using the electroosmotic forces are demonstrated. In the Stokes flow regime, the flow control is shown to have linear dependence on the magnitude of the external electric field. Hence, the electroosmotic forces can be used as linear actuators for various microfluidic applications.

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