Flow characterization in T-shaped and cross-shaped micromixers |
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Authors: | Nassim Ait Mouheb Agnes Montillet Camille Solliec Jaromir Havlica Patrick Legentilhomme Jacques Comiti Jaroslav Tihon |
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Affiliation: | (1) GEPEA UMR-CNRS 6144, Ecole des Mines de Nantes, BP 20722, 4 Rue Alfred Kastler, 44307 Nantes, France;(2) GEPEA UMR-CNRS 6144, C.R.T.T, 37 Bd de l’Universit?, BP 406, 44602 Saint-Nazaire-Cedex, France;(3) Institute of Chemical Process Fundamentals, A.S.C.R, Rozvojov? 135, 16502 Prague 6, Czech Republic; |
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Abstract: | The understanding of physical phenomena such as flow behaviour and mass transfer performance is needed in order to develop
appropriate micromixers for industrial or biomedical applications. In this article, the flow behaviour of the T-shaped and
the cross-shaped micromixers with square cross-section are studied through numerical and experimental investigations. The
comparisons are based on identical treated fluxes. From the particle image velocimetry (PIV) measurements, the flow topologies
in the T-shaped and cross-shaped micromixers are very different. After liquid impact, it is observed that the vortex structures
cover a longer part of the outlet channel in the case of the cross geometry. This result indicates that the cross-shaped micromixer
could improve the mixing process in comparison with the micromixers having T geometry. A second experimental technique has
been used, the electrochemical one, involving microelectrodes placed at several wall positions of the cross-shaped micromixer.
The electrochemical method can locally characterize the formation of swirling flows. The high values of wall shear rate, in
the impact zone, confirm the near wall disturbance created by the impingement of the flow and also the appearance of vortices
that could enhance fluid mixing. |
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