Modeling of valveless micropumps

Yeng-Yung Tsui*, Shin En Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


There are two difficulties encountered in modeling valveless micropumps using lumped-element methods. The pressure loss coefficient for fluidic diodes used in valveless pumps to rectify flow depends on the flow direction. A problem arises in choosing the proper loss correlation because the flow direction is not known a priori. Another problem is the quadratic form of the equation for the flow through the fluidic diodes, which brings about multiple solutions. The above problems become even more serious in multi-chamber cases. They are overcome in this study by suitably formulating the flow resistance. In addition, the flow inertia is accounted for in the unsteady model. The steady and unsteady models are evaluated by comparing with CFD simulations, which also serve to illustrate the flow field in more detail. It is shown that, compared with the steady model, the variation of the flow rate and pressure predicted by the unsteady model behaves in a close manner to those obtained by multidimensional calculations.

Original languageEnglish
Pages (from-to)727-745
Number of pages19
JournalNumerical Heat Transfer; Part A: Applications
Issue number9
StatePublished - 1 Jan 2009

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