Mixing in a T-shaped micromixer at moderate Reynolds numbers
A.V. Minakov1, V.YA. Rudyak2, A.A. Gavrilov1, A.A. Dekterev1
1 Kutateladze Institute of Thermophysics SB RAS; Siberian Federal University
2 Kutateladze Institute of Thermophysics SB RAS; Novosibirsk State University of Architecture and Civil Engineering
valery.rudyak@mail.ru
Keywords: microchannels, micromixers, mixing efficiency, hydrodynamic modelling, slip on walls, Dean vortices
Pages: 385-395
Abstract
In the present work, the regimes of the flow and mixing of fluids in a T-shaped micromixer in the range of the Reynolds numbers from 1 to 1000 are investigated systematically with the aid of numerical modeling. The flow and mixing regimes are shown to alter substantially with increasing Reynolds numbers. Five different flow regimes have been identified in the total. The dependencies of the friction coefficient and mixing efficiency on the Reynolds number are obtained. A sharp increase in the mixing efficiency at a flow transition from the symmetric to asymmetric steady regime is shown. On the other hand, the mixing efficiency slightly drops in the laminar-turbulent transition region. A substantial influence of the slip presence on walls on flow structure in the channel and mixing efficiency has been revealed.
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