A numerical study of the nozzle/diffuser micropump

K. S. Yang*, I. Y. Chen, K. H. Chien, Chi-Chuan Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations


This study numerically investigates the performance of micronozzle/ diffuser pump subject to the influence of frequency, opening angle, geometric dimension, and amplitude. For the effect of geometric dimension, the effect of chamber length is far more important than that of chamber depth because it can provide much more effective pumping volume. It is found that the net flowrate of a micropump increased with pumping frequency and opening angle. However, a level-off phenomenon of the net flowrate versus amplitude is seen at amplitudes nearby 150-200 μm and at an opening angle above 10°. This phenomenon is associated with two factors that compensate with each other. One is the free jet flow from the outlet that overturns and blocks the flow from the inlet. The other is the reduction of the strength of jet flow at a larger amplitude owing to effective increase of cross-sectional area.

Original languageEnglish
Pages (from-to)525-533
Number of pages9
JournalProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
Issue number3
StatePublished - 1 Mar 2008


  • Computational fluid dynamics
  • Micropump
  • Valve-less

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