In this work, a numerical comparative study is carried out to investigate a laminar steady flow behavior of shear-thinning non-Newtonian fluids in three chaotic geometries: Two-Layer Crossing Channel Micromixer, C-shaped channel and serpentine channel. The process is validated for non-Newtonian flow in a complex geometry which heated by a constant flux. Secondary flow structures are formed in the chosen geometries enhance significantly the fluid dynamic performances. To characterize this performance Poincaré map method is presented for different geometries with various cases of fluid power-law index. Thermal mixing behavior with two different inlet temperatures of shear-thinning fluids in the considered geometries is performed. For various cases of fluid power-law indexes, the TLCCM displayed thermal mixing degree enhancement of 42–84% relative to the thermal mixing degree in both C-shaped and serpentine channels. The second law of thermodynamics is controlled in terms of entropy generation due to the thermal and hydrodynamic process, as a function of low rates of generalized Reynolds number and power-law index, under the effects chaotic advection. Thereby, the TLCCM configuration exhibited very important enhancement of mixing degree than that obtained in other considered geometries, with minimization of friction and thermal irreversibilities.

在这项工作中，进行了数值比较研究，以研究在三种混沌几何形状中剪切稀化的非牛顿流体的层流稳定流动行为：两层交叉通道微混合器，C形通道和蛇形通道。通过非恒定通量加热的复杂几何形状的非牛顿流对该过程进行了验证。在选定的几何形状中形成二次流动结构，可显着提高流体动力学性能。为了表征这种性能，提出了针对具有不同流体幂律指数情况的不同几何形状的庞加莱映射方法。在考虑的几何形状下，采用两种不同的剪切稀化流体入口温度进行热混合行为。对于各种流体动力定律指标，TLCCM的热混合度相对于C形和蛇形通道的热混合度提高了42–84％。热力学第二定律在混沌平流效应的作用下，根据热和流体动力学过程产生的熵进行控制，这是广义雷诺数和幂律指数的低比率的函数。因此，与最小化摩擦和热不可逆性相比，TLCCM构造显示出比其他考虑的几何形状获得的混合度非常重要的提高。在混乱对流作用下。因此，与最小化摩擦和热不可逆性相比，TLCCM构造显示出比其他考虑的几何形状获得的混合度非常重要的提高。在混乱对流作用下。因此，与最小化摩擦和热不可逆性相比，TLCCM构造显示出比其他考虑的几何形状获得的混合度非常重要的提高。