交替旋转混合器中幂律流体的热混沌混合
Thermal Chaotic Mixing of Power-Law Fluids in a Mixer with Alternately-Rotating Walls
摘要：
本文研究了高粘度非牛顿流体在双杆混合器中的混合与传热强化。混合器由圆柱形罐中的两个垂直圆形棒组成。混沌流是通过对壁面的旋转速度施加时间调制而得到的。我们研究了不同的搅拌协议，导致非混沌和混沌流，混合和传热的效率为三种不同的流变流体行为：剪切稀化，牛顿和剪切增稠的影响。为此，我们使用统计指标，其特征的平均值的流体温度和均匀化。我们发现，混沌混合是合适的剪切增稠流体，我们观察到一个明确的增强的热混合（热提取和均匀化）。这是由于旋转壁附近的表观流体粘度增加。这一方面证实了高粘度流体的混沌混合的相关性。
英文摘要：
We investigate the enhancement of both mixing and heat transfer in a two-rod mixer for highly-viscous non-Newtonian fluids. The mixer is composed of two vertical, circular rods in a cylindrical tank. Chaotic flows are obtained by imposing the temporal modulations of the rotational velocities of the walls. We study the effects of different stirring protocols, which lead to non-chaotic and chaotic flows, on the efficiency of both mixing and heat transfer for three different rheological fluid behaviors: shear-thinning, Newtonian and shear-thickening. For this purpose, we use statistical indicators that characterize the mean value of the fluid temperature and its homogenization. We find that chaotic mixing is suitable for shear-thickening fluids for which we observe a clear enhancement of the thermal mixing (heat extraction and homogenization). This is due to the increase in the apparent fluid viscosity in the vicinity of the rotating walls. This aspect confirms the relevance of chaotic mixing for highly-viscous fluids.
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