湍流混合动力学机理研究

Kinetics mechanism of rapid mixing in turbulence

在分析传统混合动力学机理基础上,通过宏观混合与微观混合时间量级的对比,提出了湍流条件下,涡流扩散主导宏观混合,分子扩散主导微观混合,而混合过程由宏观混合主导,欧拉数Eu可作为混合效果的控制指标,并通过3种不同容积反应器的混合搅拌试验,进一步证实了该指标的实用性。

Based on the analysis of the traditional kinetics mechanism about mixing and the comparison of the relative magnitude of macroscopic and microscopic mixing time, a new kinetics mechanism on mixing in turbulence was presented. The speed of macroscopic mixing is controlled by eddy diffusion, and the speed of microcosmic mixing is controlled by molecular diffusion. The mixing process is dominated by macroscopic mixing. The Euler number can be used as the control parameter that determines the mixing efficiency. The mixing tests were conducted in three reactors of different volumes to verify the practicality of this index.