A coherent empire-theoretical approach to the flow behavior of micro diffuser channels is tried. Microdiffusers may be advantageously employed as dynamic passive valves in micropumps. The central number of merit is the rectification efficiency epsilon which expresses the flow directing performance of a passive valve. It mainly depends on the aperture angle, relative channel length, throat rounding, flow velocity, and frequency. The highest epsilon-value possible is around 0.25...0.4. The approach is mainly based on general investigations of energy conversion and experimental data from classical hydraulics. The derivations are compared with test results of different authors. (C) 1998 Elsevier Science S.A. All rights reserved. [References: 29]
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