Inspired by the animal upper digestive tract, a unique soft-elastic reactor (SER) has recently been researched whose mixing phenomena should be further investigated. Numerical simulation is an excellent method with which to explore the phenomena in SERs for a large number of conditions. It may also offer insights into the ways of effective mixing in this kind of reactor. The mixing processes in 2D SERs driven by bio-inspired wavelike boundary motions are systematically compared in this work. The influences of several key factors (i.e. the aspect ratios of rectangular SERs, the wavenumbers of moving walls, and the location and size of baffles) on the mixing performance are investigated. It has been found that mixing efficiency is better at an aspect ratio close to 1.0. The influence of wavenumber on mixing is not monotonic. Increasing the wavenumber speeds up mixing in parallel boundary type motion, while it slows it down in symmetrical-contraction boundary type motion. Mounting baffles on the left and right sides of the vessel wall (i.e. on the moving boundaries) promotes mixing. Lower porosity (≤ 0.4) of baffles benefits mixing. It has become clear that an efficient SER needs to be designed by considering not only its shape but also the wall moving mode. The work reported in this article has provided useful information on how it might be possible to improve SERs for industrial applications in future.

受动物上消化道的启发，最近研究了一种独特的软弹性反应器 (SER)，其混合现象应进一步研究。数值模拟是一种很好的方法，可用于在大量条件下探索 SER 中的现象。它还可以提供对这种反应器中有效混合方式的见解。在这项工作中系统地比较了由仿生波状边界运动驱动的 2D SER 中的混合过程。研究了几个关键因素（即矩形SER的纵横比、移动壁的波数、挡板的位置和尺寸）对混合性能的影响。已经发现，纵横比接近 1.0 时混合效率更好。波数对混合的影响不是单调的。增加波数在平行边界型运动中加速混合，而在对称收缩边界型运动中减慢混合。在容器壁的左侧和右侧（即在移动边界上）安装挡板可促进混合。挡板的孔隙率较低 (≤ 0.4) 有利于混合。很明显，高效 SER 的设计不仅需要考虑其形状，还需要考虑壁面移动模式。本文中报告的工作提供了有用的信息，说明未来如何改进工业应用的 SER。4）挡板的好处是混合。很明显，高效 SER 的设计不仅要考虑其形状，还要考虑壁面移动模式。本文中报告的工作提供了有用的信息，说明未来如何改进工业应用的 SER。4）挡板的好处是混合。很明显，高效 SER 的设计不仅要考虑其形状，还要考虑壁面移动模式。本文中报告的工作提供了有用的信息，说明未来如何改进工业应用的 SER。