A rhombic micromixer with asymmetrical flow for enhancing mixing

C. K. Chung, T. R. Shih

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


A planar three-rhombus micromixer with two constriction elements for good mixing more than 84% at Re ≥ 20 has been demonstrated by simulations and experiments. Higher constriction elements with low blockage ratios may enhance significant fluid mixing by combining principles of focusing/diverging, recirculation and Dean vortices. The local high flow velocity induced by the high constriction element provides both high inertial forces and centrifugal forces for enhancing mixing efficiency under asymmetrical flow. Recirculations and Dean vortices are strongly influenced by blockage ratios and Reynolds numbers. The smaller blockage ratio and higher Reynolds number resulted in higher mixing efficiency. In simulation, the 84% mixing efficiency was achieved at the blockage ratios of 1/8 and Re = 20 together with a low pressure drop about 3630 Pa. The trend of the verified experimental result is in good agreement with the simulation result. A good mixing efficiency can be achieved using this simple micromixer with less mixing units at lower Reynolds number and pressure drop compared to the conventional chaotic micromixers.

Original languageEnglish
Pages (from-to)2495-2504
Number of pages10
JournalJournal of Micromechanics and Microengineering
Issue number12
Publication statusPublished - 2007 Dec 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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