The effect of cavity geometry on the nucleation of bubbles from cavities
The effect of cavity geometry on the nucleation of bubbles from cavities
复制标题
DOI：
10.1121/1.2404629
复制
发表时间：
2007-02-01
影响因子：
2.4
通讯作者：
Payne, Stephen J.
中科院分区：
文献类型：
--
作者：
Chappell, Michael A.;Payne, Stephen J.
气泡从与液体接触的表面中的空腔中的非均质成核是一种被广泛认识的现象。这个过程以前已经在理论上分析了广泛的锥形缝隙，虽然在实践中可能会出现各种各样的腔体几何形状。最初由Atchley和Prosperetti [J. Acoust.美国社会86，1065-1084（1989）]的气-液界面在锥形缝隙中的不稳定增长，在这里扩展到任何轴对称腔的几何形状和四个这样的不同的几何形状进行了分析。虽然该方法忽略了气体传输，因此是最直接适用于声空化，这种方法仍然是有价值的比较不同类型的空腔的成核行为。研究发现，一旦界面出现在空腔外，其行为取决于空腔开口的大小。考虑到一旦界面在空腔外部的行为也将由局部流动条件决定，导致其出现的空腔内部界面不稳定增长的阈值是重要的值，并且将决定实际中空腔几何形状之间的差异，如所示的示例中所示。(c)2007年，美国声学学会。
The heterogeneous nucleation of gas bubbles from cavities in a surface in contact with a liquid is a widely recognized phenomenon. This process has previously been theoretically analyzed extensively for a conical crevice, although in practice a wide range of cavity geometries might be expected. The method of analysis originally presented by Atchley and Prosperetti [J. Acoust. Soc. Am. 86, 1065-1084 (1989)] for the unstable growth of a gas-liquid interface in a conical crevice is here extended to any axisymmetric cavity geometry and four such different geometries are analyzed. Although the method presented neglects gas transfer, and therefore is most directly suitable for acoustic cavitations, this method is still valuable in comparing the nucleation behavior of different cavity types. It is found that once the interface has emerged outside the cavity, its behavior is determined by the size of the cavity's opening. Given that the behavior of the interface once it is outside the cavity will also be determined by the local flow conditions, the threshold for unstable growth of the interface inside the cavity leading to its emergence is the important value and will determine differences between cavity geometries in practice, as shown in the examples presented. (c) 2007 Acoustical Society of America.