Mixing processes in a zigzag microchannel: Finite element simulations and optical study
Mixing processes in a zigzag microchannel: Finite element simulations and optical study
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DOI：
10.1021/ac025642e
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发表时间：
2002-08-15
影响因子：
7.4
通讯作者：
Girault, HH
中科院分区：
文献类型：
--
作者：
Mengeaud, V;Josserand, J;Girault, HH
采用有限元模型研究了100 μ m宽的“Y”型入口交界的之字形微通道中物质的混合过程。通过连续求解稳态形式的Navier-Stokes方程和扩散-对流方程，得到了浓度的分布。由于研究的雷诺数范围大（1 < Re < 800），因此采用高扩散系数进行二维扩散对流模拟。结果说明了流量和流量的影响。通道几何对流体力学和混合效率的影响。在近似于80的临界雷诺数以下，混合完全由分子扩散来保证。对于较高雷诺数，模拟显示层流再循环的混合贡献。扩散系数越低，这种效应越强。不同流速下的混合实验研究显示了相同的水动力趋势。
A finite element model has been used in order to study the mixing process of species in a 100-mum-wide zigzag microchannel integrating a "Y" inlet junction. The distribution of the concentration was obtained by solving successively the Navier-Stokes equation and the diffusion-convection equation in the steady state form. Because of the large range of Reynolds numbers studied (1 < Re < 800), the 2D diffusion-convection simulations are carried out with high diffusion coefficients. The results illustrated the effects of both flow rate and. channel geometry on hydrodynamics and mixing efficiency. Below a critical Reynolds number of similar to80, the mixing is entirely ensured by, molecular, diffusion. For higher Reynolds numbers, simulations revealed the mixing contribution of laminar flow recirculations. This effect increases for lower values of diffusion coefficients. Experimental studies on the mixing of species at different flow rates are reported showing the same hydrodynamic tendency.