Simulation and fabrication of a branch-channel rhombic micromixer for low pressure drop and short mixing length

Chen-Kuei Chung, C. K. Chang, C. C. Lai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The planar micromixers merit easy integration with the microsystem but encounter the problems of high pressure drop and long mixing length for high mixing efficiency over 90 %. In this article, an advanced branched rhombic micromixer (BRM) have been designed and investigated by 3D numerical simulations and experiments. Polydimethylsiloxane (PDMS) molding process was used for chip fabrication of the experiment. The CFD-ACE+software was applied for modeling simulations. Simulation results showed that this optimum geometry design of four-mixing-unit BRM with the branch position at 700 μm high and 100 μm wide can effectively improve the mixing efficiency over 95 % at Reynolds number (Re) 120 with a rather low pressure drop about 9,000 Pa and a short mixing length of 5.5 mm as well. The high mixing efficiency at low pressure drop is attributed to the greatly increased contact interface area and chaotic-convection vortices as well as the low flow resistance with branched channels. The mixing verification is performed by the flow visualization system via the popular rhodamine B dye (10 mM) added DI method for PDMS BRM chips.

Original languageEnglish
Pages (from-to)1981-1986
Number of pages6
JournalMicrosystem Technologies
Volume20
Issue number10-11
DOIs
Publication statusPublished - 2014 Oct 1

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pressure drop
Pressure drop
low pressure
Fabrication
fabrication
simulation
rhodamine B
Polydimethylsiloxane
chips
flow resistance
Microsystems
flow visualization
Computer simulation
Flow visualization
charge flow devices
rhodamine
Molding
encounters
Contacts (fluid mechanics)
Reynolds number

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

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abstract = "The planar micromixers merit easy integration with the microsystem but encounter the problems of high pressure drop and long mixing length for high mixing efficiency over 90 {\%}. In this article, an advanced branched rhombic micromixer (BRM) have been designed and investigated by 3D numerical simulations and experiments. Polydimethylsiloxane (PDMS) molding process was used for chip fabrication of the experiment. The CFD-ACE+software was applied for modeling simulations. Simulation results showed that this optimum geometry design of four-mixing-unit BRM with the branch position at 700 μm high and 100 μm wide can effectively improve the mixing efficiency over 95 {\%} at Reynolds number (Re) 120 with a rather low pressure drop about 9,000 Pa and a short mixing length of 5.5 mm as well. The high mixing efficiency at low pressure drop is attributed to the greatly increased contact interface area and chaotic-convection vortices as well as the low flow resistance with branched channels. The mixing verification is performed by the flow visualization system via the popular rhodamine B dye (10 mM) added DI method for PDMS BRM chips.",
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Simulation and fabrication of a branch-channel rhombic micromixer for low pressure drop and short mixing length. / Chung, Chen-Kuei; Chang, C. K.; Lai, C. C.

In: Microsystem Technologies, Vol. 20, No. 10-11, 01.10.2014, p. 1981-1986.

Research output: Contribution to journalArticle

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AU - Chang, C. K.

AU - Lai, C. C.

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