Turbulent mixing

被引:394
作者
Dimotakis, PE [1 ]
机构
[1] CALTECH, Grad Aeronaut Labs, Pasadena, CA 91125 USA
关键词
turbulence; entrainment; scalar dispersion; diffusion; reacting flow;
D O I
10.1146/annurev.fluid.36.050802.122015
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The ability of turbulent flows to effectively mix entrained fluids to a molecular scale is a vital part of the dynamics Of Such flows, with wide-ranging consequences in nature and engineering. It is a considerable experimental, theoretical, modeling, and computational challenge to capture and represent turbulent mixing which, for high Reynolds number (Re) flows, occurs across a spectrum of scales of considerable span. This consideration alone places high-Re mixing phenomena beyond the reach of direct simulation, especially in high Schmidt number fluids, such as water, in which species diffusion scales are one and a half orders of magnitude smaller than the smallest flow scales. The discussion below attempts to provide an overview of turbulent mixing; the attendant experimental, theoretical, and computational challenges; and suggests possible future directions for progress in this important field.
引用
收藏
页码:329 / 356
页数:28
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