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该文研究了平板边界层中的双峰谱分布颗粒系统的演变过程。用层流平板边界层的解析解(Blasius解)来给出流场分布。对于颗粒相,利用了一种新的矩方法模型,即二元泰勒展开矩量法(BTEMOM),描述对流、扩散和凝并等动力学过程。验证了新模型对双峰颗粒系统的效率和精度。在边界层的强剪切作用下,最终研究了特征参数如数密度、标准偏差以及几何体积。 相似文献
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Based on the transport phenomena theory, the passive mixing of water and ethanol in different three-dimensional microchannels is simulated numerically. The average variance of water volume fraction is used to index the mixing efficiency in the cases with different Reynolds number and different fabricated mixers. The results show that the efficiency of liquid mixing is progressively dependent on the convective transport as the Reynolds number increases. The efficiency of serpentine microchannel decreases with the increasing Reynolds number in the laminar regime. Altering the aspect ratio of channel inlet section has no significant effect on the mixing efficiency. Increasing the area of channel inlet section will cause the decrease of the mixing efficiency. The mixing in serpentine channels is the most efficient among three different mixers because of the existence of second flow introduced by its special structure. 相似文献
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