An active inline mixer suitable for flows at low Reynolds number and high Péclet number is studied. An alternated oscillatory forcing protocol is imposed by three rotating circular arc-walls in a straight channel. In the two-dimensional case, simple phenomenological arguments are used to estimate heuristically the mixing efficiency with two nondimensional control parameters: the Strouhal number based on the bulk flow velocity and the strength of the cross flow relative to the transport flow. The validity and limitations of the proposed mixing conditions are explained by the transport mechanisms in the mixer. The beneficial role of the elliptic flow regions for stretching and folding the passive scalar interfaces is highlighted as well as a correlation between good mixing ability and the chaotic advection of tracers in the mixing zone.

中文翻译：

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带有旋转弧形壁的通道中的主动混沌混合

研究了一种适用于低雷诺数和高佩克利数的流量的有源在线混合器。交替的振荡强迫协议是由直通道中的三个旋转圆弧壁施加的。在二维情况下，简单的现象学参数用于启发式估计具有两个无量纲控制参数的混合效率：基于整体流速的Strouhal数和相对于输送流的横流强度。所提出的混合条件的有效性和局限性由混合器中的传输机制来解释。椭圆形流动区域对于拉伸和折叠无源标量界面的有益作用以及在混合区域中示踪剂的混沌平流与良好混合能力之间的相关性得到了强调。