Systematic Study on the Coalescence and Breakup Behaviors of Multiple Parallel Bubbles Rising in Power-law Fluid
Systematic Study on the Coalescence and Breakup Behaviors of Multiple Parallel Bubbles Rising in Power-law Fluid
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DOI：
10.1021/ie4037565
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发表时间：
2014-03
影响因子：
4.2
通讯作者：
Jingru Liu;Chun-Qiu Zhu;Taotao Fu;Youguang Ma
中科院分区：
文献类型：
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作者：
Jingru Liu;Chun-Qiu Zhu;Taotao Fu;Youguang Ma
采用流体体积法（VOF）对幂律非牛顿流体中多个平行气泡的聚并和破碎行为进行了数值研究。系统地研究了幂律流体中气泡数目、气泡直径、气泡间距和流动指数对气泡聚并和破碎的影响。通过数值模拟，得到了幂律流体在不同流动指数下，两个、三个和四个不同直径气泡聚并的无因次临界水平间距。基于临界接近速度理论，提出了一种计算气泡聚并临界间距的定量判据。气泡在聚并过程中发生了剧烈的变形。发现并说明了两种不同的气泡合并和破裂行为：（I）所有气泡合并成一个大气泡;（II）多个气泡之间的部分气泡合并。对于两个或三个平行的气泡，只有政权...
The coalescence and breakup behaviors of multiple parallel bubbles rising in power-law non-Newtonian fluid were investigated numerically by Volume of Fluid (VOF) method. The effects of the number of bubbles, bubble diameter, bubble interval, and flow index of power-law fluid on bubble coalescence and breakup were studied systematically. The dimensionless critical horizontal intervals of bubble coalescence for two, three, and four bubbles with different diameters were attained respectively by simulation under different flow indexes of power-law fluid. A quantitative criterion was developed to compute the critical bubble interval for bubble coalescence based on the critical approach velocity theory. Dramatic deformations of bubbles were found during the coalescence processes. Two different bubble coalescence and breakup behaviors were found and illustrated: (I) all bubbles coalesce into one big bubble; (II) coalescence of partial bubbles among multiple bubbles. For two or three parallel bubbles, only regime...