MSM 99
MSM 99
Technical Proceedings of the 1999 International Conference on Modeling and Simulation of Microsystems

Applications: Microfluidics Chapter 16

Numerical Simulations of Flat-Walled Diffuser Elements for Valveless Micropumps

Authors: A. Olsson, G. Stemme and E. Stemme

Affilation: Royal Institute of Technology, Sweden

Pages: 585 - 588

Keywords: numerical simulations, flat-walled diffuser elements, valveless micropumps

Abstract:
The flow directing capability of micromachined flat-walled diffuser elements for valve-less micropumps have been investigated. The diffuser element is a small angle flow channel with a rounded inlet and a preferably sharp outlet. The diverging-wall direction is the positive flow direction. The commercial Computational Fluid Dynamics program ANSYS/Flotran (version 5.3) was used to simulate the flow pressure characteristic of several diffuser elements. The simulations are compared with experimental results. It is found that the simulated flow-pressure characteristic agrees well with the measured in the converging-wall direction and for Reynolds number below 300-400 in the diverging-wall direction. For higher Reynolds numbers the pressure loss in the diverging-wall direction is underestimated. The simulations are not sufficient for design optimization, but is very useful to increase the qualitative understanding of the flow in the diffuser element.

Numerical Simulations of Flat-Walled Diffuser Elements for Valveless Micropumps

ISBN: 0-9666135-4-6
Pages: 697