In this paper, we have studied the effect of variable-angle grooves and baffles on the mixing efficiency of the micromixer. In order to explore the influence on the micromixer with different types of grooves and baffles, we designed grooves and baffles with different geometric parameters and placed them in T-channels to interfere with fluid flow. We studied VAM30^∘ (variable-angle grooves and baffles micromixer with an angle of 30^∘) directions and distributions as well as their different groove depths and baffle heights affect the mixing performance. We tried to divide the grooves and baffles into five groups, and discussed the effects of staggered depth and height on mixing efficiency. The mixing efficiencies of micromixer in the Re (Reynolds number) range of 0.1–100 were calculated, and the fluid flow in the microchannel was analyzed. The simulation results show that VAM30^∘ is more favorable for solution mixing. The mixing efficiency of the micromixer could reach 98.9% with the change of different geometric parameters. This is because when the structure changes, the flow state of the fluid is improved, which is conducive to lengthening the residence time of the fluid in the channel. With the increase of Re, it is also conducive to enhancing the chaotic convection and improving the mixing efficiency.

中文翻译：

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具有可变角度凹槽和挡板的三维无源微混合器的数值模拟

在本文中，我们研究了可变角度凹槽和挡板对微混合器混合效率的影响。为了探索不同类型的凹槽和挡板对微混合器的影响，我们设计了不同几何参数的凹槽和挡板，并将它们放置在T形通道中以干扰流体流动。我们研究了VAM30∘ ^{（ 30 °}变角槽挡板微混合器）) 方向和分布以及它们不同的凹槽深度和挡板高度会影响混合性能。我们尝试将凹槽和挡板分为五组，并讨论了交错深度和高度对混合效率的影响。计算了Re（雷诺数）0.1-100范围内的微混合器的混合效率，并分析了微通道中的流体流动。仿真结果表明，VAM30 ^∘更有利于溶液混合。随着几何参数的变化，微混合器的混合效率可达98.9%。这是因为当结构发生变化时，流体的流动状态得到改善，有利于延长流体在通道中的停留时间。随着Re的增加，也有利于增强混沌对流，提高混合效率。