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The present paper describes the pressure performance of a viscous micropump using a cylindrical rotor in a rectanglar duct using both experimental method and numerical simulation. In the experiment, the low Reynolds flow in the micropump is realized by using glycerin as work fluid and a usual-scale (not micro-scale) model pump. In the numerical simulation, the commercial software, STAR-CD, is used. Qualitatively and quantitatively, there are good agreements between the experimental and numerical results with respect to the flow fields and pressure performance. The flow fields show three vortices which rotate in the direction opposite of the cylindrical rotor. The pressure performance of the micropump shows straight lines with negative slopes. A new nondimensional number is proposed to estimate the pressure performance of viscous micropumps.

Model Experiments and Numerical Simulations on the Performance and Flow Fields of a Viscous Micropump Using Cylindrical Rotor