Passive mixing in a three-dimensional serpentine microchannel

Robin H. Liu, Mark A. Stremler, Kendra V. Sharp, Michael G. Olsen, Juan G. Santiago, Ronald Adrian, Hassan Aref, David J. Beebe

Research output: Contribution to journalArticle

991 Citations (Scopus)

Abstract

A three-dimensional serpentine microchannel design with a 'C-shaped' repeating unit is presented in this paper as a means of implementing chaotic advection to passively enhance fluid mixing. The device is fabricated in a silicon wafer using a double-sided KOH wet-etching technique to realize a three-dimensional channel geometry. Experiments using phenolphthalein and sodium hydroxide solutions demonstrate the ability of flow in this channel to mix faster and more uniformly than either pure molecular diffusion or flow in a 'square-wave' channel for Reynolds numbers from 6 to 70. The mixing capability of the channel increases with increasing Reynolds number. At least 98% of the maximum intensity of reacted phenolphthalein is observed in the channel after five mixing segments for Reynolds numbers greater than 25. At a Reynolds number of 70, the serpentine channel produces 16 times more reacted phenolphthalein than a straight channel and 1.6 times more than the square-wave channel. Mixing rates in the serpentine channel at the higher Reynolds numbers are consistent with the occurrence of chaotic advection. Visualization of the interface formed in the channel between streams of water and ethyl alcohol indicates that the mixing is due to both diffusion and fluid stirring.

Original languageEnglish (US)
Pages (from-to)190-197
Number of pages8
JournalJournal of Microelectromechanical Systems
Volume9
Issue number2
DOIs
StatePublished - Jun 2000
Externally publishedYes

Fingerprint

Microchannels
Reynolds number
Advection
Fluids
Wet etching
Silicon wafers
Ethanol
Visualization
Sodium
Geometry
Water
Experiments

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering

Cite this

Liu, R. H., Stremler, M. A., Sharp, K. V., Olsen, M. G., Santiago, J. G., Adrian, R., ... Beebe, D. J. (2000). Passive mixing in a three-dimensional serpentine microchannel. Journal of Microelectromechanical Systems, 9(2), 190-197. https://doi.org/10.1109/84.846699

Passive mixing in a three-dimensional serpentine microchannel. / Liu, Robin H.; Stremler, Mark A.; Sharp, Kendra V.; Olsen, Michael G.; Santiago, Juan G.; Adrian, Ronald; Aref, Hassan; Beebe, David J.

In: Journal of Microelectromechanical Systems, Vol. 9, No. 2, 06.2000, p. 190-197.

Research output: Contribution to journalArticle

Liu, RH, Stremler, MA, Sharp, KV, Olsen, MG, Santiago, JG, Adrian, R, Aref, H & Beebe, DJ 2000, 'Passive mixing in a three-dimensional serpentine microchannel', Journal of Microelectromechanical Systems, vol. 9, no. 2, pp. 190-197. https://doi.org/10.1109/84.846699
Liu, Robin H. ; Stremler, Mark A. ; Sharp, Kendra V. ; Olsen, Michael G. ; Santiago, Juan G. ; Adrian, Ronald ; Aref, Hassan ; Beebe, David J. / Passive mixing in a three-dimensional serpentine microchannel. In: Journal of Microelectromechanical Systems. 2000 ; Vol. 9, No. 2. pp. 190-197.
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