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Numerical Modeling and Experimental Investigation of Improved Mixing from both Coriolis Effect and Gortler Vortices in Rotating Zigzag Microchannel

机译:旋转之曲面微通道中科里奥利效应和戈尔司机改善混合的数值模拟与实验研究

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The flow pattern and mixing performance in different geometries of microchannels are investigated. A study for the zigzag shape channel under both stationary and rotation condition was investigated. The results are compared to the straight channel. Both numerical model via CFD and experiments are agreeing with each other. It is found when the channel is under rotation, the mixing performance is better than the stationary condition due to rotation induced Coriolis effect. As the rotation speed increases from 300rpm to 900rpm, an improved mixing performance can be further obtained. Our study results also demonstrate that zigzag channel can provide relatively better mixing, because the successive bending design can lead to secondary flow in the cross sectional directions due to Gortler vortices generated from centrifugal effect as the flow negotiates the "turns" or "bends" of the channel, and this adds to mixing in addition to that due to aforementioned Coriolis effect. An analysis reveals that zigzag shape channel requires more pressure drop when compared with the straight channel in order to maintain the continuous throughflow due to the pressure/head loss as the flow encounters each bend and these losses become additive. This adds to the cost for the improved mixing from the Gortler vortices.
机译:研究了微通道不同几何形状的流动模式和混合性能。研究了在静止和旋转条件下的Z字形形状通道的研究。结果与直通道进行比较。通过CFD和实验的数值模型都同意彼此同意。在旋转处于旋转时发现,混合性能优于旋转引起的科里奥利效应的静止状态。随着旋转速度从300rpm增加到900rpm,可以进一步获得改善的混合性能。我们的研究结果还证明Z字形通道可以提供相对更好的混合,因为连续弯曲设计可能导致横截面方向上的二次流动由于从离心效应产生的戈尔珀·涡流,因为流量谈判“转弯”或“弯曲”除此之外,该通道还增加了混合,因为由于上述Coriolis效应。分析表明,与直流通道相比,Z字形形状通道需要更多的压降,以便由于压力/头部损耗而导致连续的通过流量,因为流动遇到每个弯曲并且这些损耗变得添加剂。这增加了从戈尔特涡流的改进混合的成本。

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