Interfacial mixing in stratified flows
Interfacial mixing in stratified flows
复制标题
分层流中的界面混合
DOI：
10.1080/00221688609499323
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发表时间：
1986
影响因子：
2.3
通讯作者：
G. Christodoulou
中科院分区：
文献类型：
--
作者：
G. Christodoulou
本文研究了密度界面处的湍流混合现象。在混合过程的统一观点的基础上，寻求定量规律，这将是普遍有效的流动平均运动在至少一个层。通过对四种分层流的实验数据的重新研究，再辅以理论考虑，我们发现了四种这样的控制规律，它们都是幂次形式，适用于总体理查德森数Ri 0的不同范围。其中两个定律涉及超临界和亚临界条件，被认为是基本的，它们与界面混合的性质不同的机制有关。一个中间定律适用于单位临界Ri 0值附近，而一个渐近定律对应于Ri 0趋于零时均匀流动的极限。所有上述定律都是用平均流动特性的简单表达式给出的，允许它们直接应用于定量分析。
In this paper the phenomenon of turbulent mixing at a density interface is studied. Based on a unified view of the mixing processes, quantitative laws are sought, which would be generally valid in flows with mean motion in at least one of the layers. Re-examination of available experimental data from four types of stratified flow, supplemented by theoretical considerations, leads to the identification of four such governing laws, all of a power form, applicable in different ranges of the overall Richardson number, Ri 0. Two of these laws refer to supercritical and subcritical conditions and are considered as fundamental, being related to qualitatively different mechanisms of interfacial mixing. An intermediate law applies around the critical Ri 0 value of unity, while an asymptotic law corresponds to the limit of homogeneous flow as Ri 0 tends to zero. All the above laws are given by simple expressions in terms of the mean flow characteristics, allowing their straightforward application for the quantifica...