Control mechanism and affecting factors of cavitation bubble growth within a droplet

被引：0
|
作者：
Lü M. [1 ]
Ning Z. [1 ]
Sun C.-H. [1 ]
Li Y.-X. [1 ]
机构：
[1] School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing
来源：
Ning, Zhi (zhining@bjtu.edu.cn) | 1600年 / Zhejiang University卷 / 30期
关键词：
Cavitation bubble; Control mechanism; Droplet; Growth; Numerical simulation;
D O I：
10.3969/j.issn.1003-9015.2016.06.008
中图分类号：
学科分类号：
摘要：
Cavitation bubbles exist in diesel droplets when bulk liquids break up under supercavitation of diesel injection, and they can increase droplet instability during bubble growth, while the mechanism of this effect is still not clear. Spherically symmetric bubble expansion within diesel droplets was numerically simulated based on the volume of fluid (VOF) method, and the control mechanism and affecting factors of bubble growth were analyzed by Rayleigh-Plesset equation. The results show that the bubble growth process can be divided into three stages including surface tension controlled domain, comprehensive competition controlled domain and inertial force controlled domain. Cavitation bubble growth is mainly controlled by surface tension during the first stage, and the inertial force acting on bubble-liquid interface and the viscous force are insignificant. During the second stage, bubble growth is controlled by comprehensive competition among surface tension, inertial force and viscous force. Finally, bubble growth is significantly controlled by inertial force during the third stage. The effects of surface tension coefficient, liquid viscosity and density on bubble growth process were analyzed. © 2016, Editorial Board of “Journal of Chemical Engineering of Chinese Universities”. All right reserved.
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页码：1292 / 1299
页数：7
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