In this paper, a T-shape microchannel containing a mixing unit inserted in the straight main channel is designed to increase the mixing quality by geometrical changings in the mixing unit. Governing equations on flow field and concentration field have been discretized and solved using finite element method. Obtained numerical results were validated by comparing the numerical data reported in literature which show acceptable agreement. A MQ parameter based on the concentration variation of the mixture is employed to evaluate the mixing quality in the micromixer. The PI factor is also represented to check the increment in mixing quality with reference to hydraulic parameters. The effect of the number of mixing unit periods and curvature of the obstacles located in mixing unit on the MQ and PI factors have been investigated. The numerical results indicate that the type II gives better PI, so it has been chosen as the main case for the rest of study. On the other hand, the number of mixing unit periods was increased up to 25 for the type II. The results show that the best mixing quality (85.8%) has been obtained when 25-period mixing unit has been used. Also, noticeable mixing quality (81.2%) has been achieved for blood as working fluid using the proposed micromixer which could make it suitable for all chemical systems.

在本文中，设计了一个T型微通道，其中包含插入笔直主通道中的混合单元，以通过混合单元中的几何形状变化来提高混合质量。使用有限元方法离散化和求解了关于流场和浓度场的控制方程。通过比较文献中报道的数值数据验证了获得的数值结果，这些数据显示出可接受的一致性。使用基于混合物浓度变化的MQ参数来评估微混合器中的混合质量。PI因子也表示为参照液压参数检查混合质量的增量。研究了混合单元周期数和位于混合单元中的障碍物曲率对MQ和PI因子的影响。数值结果表明II型具有更好的PI，因此已将其作为其余研究的主要案例。另一方面，类型II的混合单元周期数增加到25个。结果表明，当使用25周期混合单元时，可获得最佳混合质量（85.8％）。此外，使用拟议的微型混合器，已将血液作为工作流体达到了显着的混合质量（81.2％），这使其适用于所有化学系统。