Computational fluid dynamic simulations are used to characterize the flow and the liquid mixing quality in a micromixer as a function of the Reynolds number. Two micromixers are studied in steady flow conditions; they are based on two geometries, respectively T-shaped and cross-type (⊤ and + shapes). Simulations allow, in the case of ⊤ micromixers, to chart the topology of the flow and to describe the evolution of species concentration downstream the intersection. The streamline layout and the mixing quality curves reveal the three characteristic types of flow, depending on Reynolds number: stratified, vortex and engulfment flows. Vortices appear after impingement, in the exit channel. They become asymmetrical and gain in length with an increase in Re making the flow unsteady, which induces an enhancement of the mass transfer by advection between the two liquids. In the case of cross-type micromixers, the structure of the flow is strongly three-dimensional. It is characterized by symmetrical vortices in both output channels. In the zone close to the impingement, a back flow is observed which induces strong shear stresses. The results show that the + shaped system can improve the mixing process in comparison with the micromixers having ⊤ geometry. The numerical study also allows to select the locations of the most relevant zones of study, from an experimental point of view. It will allow to choose the location of PIV planes and local non intrusive sensors, such as electrochemical microprobes, in order to experimentally investigate the flow.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Numerical Study of the Flow and Mass Transfer in Micromixers
Nassim Ait Mouheb,
Nassim Ait Mouheb
Ecole des Mines de Nantes, Nantes, France
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Camille Solliec,
Camille Solliec
Ecole des Mines de Nantes, Nantes, France
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Agnes Montillet,
Agnes Montillet
GEPEA UMR CNRS, Saint-Nazaire, France
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Jacques Comiti,
Jacques Comiti
GEPEA UMR CNRS, Saint-Nazaire, France
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Patrick Legentilhomme,
Patrick Legentilhomme
GEPEA UMR CNRS, Saint-Nazaire, France
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Jaromir Havlica
Jaromir Havlica
Institute of Chemical Process Fundamentals, Prague, Czech Republic
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Nassim Ait Mouheb
Ecole des Mines de Nantes, Nantes, France
Camille Solliec
Ecole des Mines de Nantes, Nantes, France
Agnes Montillet
GEPEA UMR CNRS, Saint-Nazaire, France
Jacques Comiti
GEPEA UMR CNRS, Saint-Nazaire, France
Patrick Legentilhomme
GEPEA UMR CNRS, Saint-Nazaire, France
Jaromir Havlica
Institute of Chemical Process Fundamentals, Prague, Czech Republic
Paper No:
ICNMM2008-62273, pp. 241-248; 8 pages
Published Online:
June 11, 2009
Citation
Ait Mouheb, N, Solliec, C, Montillet, A, Comiti, J, Legentilhomme, P, & Havlica, J. "Numerical Study of the Flow and Mass Transfer in Micromixers." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 241-248. ASME. https://doi.org/10.1115/ICNMM2008-62273
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