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首页> 外文期刊>Journal of Fluids Engineering: Transactions of the ASME >A Comparative Analysis of Mixing Performance of Power-Law Fluid in Cylindrical Microchannels With Sudden Contraction/Expansion
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A Comparative Analysis of Mixing Performance of Power-Law Fluid in Cylindrical Microchannels With Sudden Contraction/Expansion

机译：圆柱形微通道突然收缩/膨胀圆柱微通道中电力液混合性能的比较分析

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摘要

This paper focuses on the comparative electrokinetic micromixing of non-Newtonian fluid in cylindrical microchannels with surface potential heterogeneity due to sudden constriction/expansion. In numerical simulations, the rheology of the aqueous solution is considered to follow power-law characteristic. Based on the Poisson-Nernst-Planck model, the simulations are performed to investigate the mixing efficiency and pressure drop for constricted and expanded configurations over a wide range of the flow behavior index, potential patch strength, and geometric parameters. The results show that, irrespective of geometric configurations, the mixing efficiency can be improved significantly by increasing the flow behavior index, geometric parameters, and the overpotential patch strength. In addition, it is also revealed that the constricted geometry yields better mixing as compared to the other configuration, but the average pressure drop shows reverse characteristics. Thus, a parametric relationship is tried to be established between mixing efficiency and pressure drop for both these configurations to propose an effective and efficient micromixer, which can produce maximum possible mixing efficiency with minimum pressure drop.
机译：本文侧重于由于突然收缩/膨胀引起的具有表面电位异质性的圆柱形微通道中非牛顿流体的比较电动微调。在数值模拟中，认为水溶液的流变学被认为是遵循功率法的特征。基于Poisson-nernst-Planck模型，进行模拟，以研究在多种流动行为指数，潜在贴片强度和几何参数范围内进行收缩和扩展配置的混合效率和压降。结果表明，无论几何配置如何，通过增加流动行为指数，几何参数和过电贴片强度，可以显着提高混合效率。另外，还揭示了与其他配置相比，收缩几何形状产生更好的混合，但平均压降显示了反向特性。因此，尝试在混合效率和压力下降之间建立参数关系，这两种配置都提出了一种有效且有效的微混合器，其可以产生最大的压力下降的最大可能的混合效率。

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