Abstract
Based on the theory of Dean instability, the mixing process of two miscible fluids in a T-micromixer was investigated under symmetric and asymmetric inlet boundary conditions. The secondary vortex structures at selected cross-sections along the micromixer were obtained by CFD simulation and presented with different vortex identification methods. The mixing characteristics under the influences of vortices were qualitatively and quantitatively analyzed. The results demonstrate that four types of secondary vortex structures could be formed and developed in the micromixer, depending on the Dean number. For the symmetric inlet boundary condition, stable secondary vortex structures will increase the species contact areas, thus the engulfment Dean vortices provide much stronger mass transfer in the transversal direction compared with the asymmetric one. This study can provide an insight into the underlying vortex phenomena behind the mixing in a T-micromixer.
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