Efficient micromixers are largely used in different industrial applications. The mixing in laminar regime at low Reynolds numbers has a major significance in some processes. Exploiting the physical phenomenon of chaotic advection to improve the mixing efficiency is a well-established technique. This work consists in studying numerically the influence of the micromixers geometry on the hydrodynamic and thermal mixing performances using different configurations, which are respectively: TLCCM with an aspect ratio of l/W = 1, L-Shape, OH, and OX. All micromixer geometries have the same hydraulic diameter and an equivalent length. The numerical simulations were performed with low Reynolds numbers (0.2 – 70). Navier-Stokes equations were solved numerically using a commercial CFD software (ANSYS Fluent). Thus, the model adopted to characterize the mixing is the species transport model. To analyze the obtained results, the mass fraction contours, the velocity vectors and profiles, the temperature contours, the friction coefficient and the mixing energy cost were presented. The results show that the proposed micromixer has the best mixing performance with a mixing index that reaches to 0.99, and thermal mixing index more than 0.932 at very low Reynolds numbers, it also has the lowest mixing energy cost compared to that obtained in previous works.

高效的微型混合器广泛用于不同的工业应用中。在低雷诺数下，层流状态下的混合在某些过程中具有重要意义。利用混沌对流的物理现象来提高混合效率是一项成熟的技术。这项工作包括使用不同的配置对数值模拟微型混合器的几何形状对流体动力和热混合性能的影响，分别是：TLCCM，长径比为L / W  = 1，L-形状，OH和OX。所有微型混合器的几何形状都具有相同的水力直径和相等的长度。数值模拟是在低雷诺数（0.2 – 70）下进行的。Navier-Stokes方程使用商业CFD软件（ANSYS Fluent）进行了数值求解。因此，用来表征混合的模型是物种迁移模型。为了分析获得的结果，给出了质量分数等值线，速度矢量和轮廓，温度等值线，摩擦系数和混合能量成本。结果表明，所提出的微混合器在极低的雷诺数下具有最佳的混合性能，混合指数达到0.99，热混合指数超过0.932，与以前的工作相比，它具有最低的混合能量成本。