Abstract

An experimental investigation of flow pattern regimes and mixing inside a T-type microchannel for different inlet flowrate ratios was carried out. Seven flow pattern regimes were obtained experimentally. Partial penetration of the flow into the opposite input channel with occurrence of one vortex was shown by Rahimi et al. [8]. We experimentally demonstrate arising of two vortex structures rotating about their axes in the case of partial penetration of the flow into the opposite input channel. In addition, we reveal appearance of periodic waviness streaks, absent in previous works. We also investigated the evolution of a transparent periodic vortex structure inside the outlet microchannel. It is a very slow periodic process. The mixing efficiency for all flow regimes is estimated. A maximum mixing of 0.87 is achieved for the streaks and unsteady regimes. We also discover that the biggest mixing efficiency is equal to 0.67, reached at \(R=0.25\) and a low outlet Reynolds number Re = 47.

中文翻译：

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固定出口雷诺数的不同入口流量比的情况下，对称微通道中流动状态的可视化

摘要

对不同进气流量比的T型微通道内的流型状态和混合进行了实验研究。通过实验获得了七个流型方案。Rahimi等人显示，在发生一个涡流的情况下，流体部分渗透到相反的输入通道中。[8]。我们通过实验证明了两个涡流结构在流向相对的输入通道的部分渗透的情况下绕其轴旋转的情况。此外，我们揭示了以前作品中没有的周期性波纹条纹的出现。我们还研究了出口微通道内部透明周期性涡旋结构的演变。这是一个非常缓慢的周期性过程。估计了所有流态的混合效率。最大混合为0。条纹和不稳定状态达到87。我们还发现最大混合效率等于0.67，达到\（R = 0.25 \）和低雷诺数Re = 47。