Abstract The micromixer geometry presented consists of T-type micromixer with premixing chamber, hexagonal shaped chambers and obstacles. In order to observe influences of obstacle shape, aspect ratio and position, simulations are carried out for two types of obstacle shapes viz. rectangular and triangular for the Reynold number in the range from 0.1 to 75. Flow and mixing dynamics are studied to investigate the effect of geometric modifications for identifying the mixing mechanisms. The effect of obstacle shape, aspect ratio and position is investigated using the performance characteristics viz. mixing index and pressure drop quantitatively. Both the micromixers demonstrate different mixing mechanisms, including transverse flow, vortices and chaotic advection due to split and recombination action. The mixing performance is diffusion dominated below Re < 5 and it is advection dominated beyond Re > 5. At Re ≥ 20, the mixing index observed is 0.80 in all the micromixer design configurations.

中文翻译：

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形状、纵横比和障碍物位置对六边形室微混合器混合增强的影响

摘要 所提出的微混合器几何结构由带有预混室、六边形室和障碍物的 T 型微混合器组成。为了观察障碍物形状、纵横比和位置的影响，对两种障碍物形状进行了模拟。雷诺数在 0.1 到 75 范围内的矩形和三角形。研究流动和混合动力学以研究几何修改对识别混合机制的影响。使用性能特征即研究障碍物形状、纵横比和位置的影响。定量混合指标和压降。两种微混合器都表现出不同的混合机制，包括横向流动、涡流和由于分裂和重组作用引起的混沌平流。