摘要
采用VOF-CSF法模拟研究了幂律型非牛顿流体中双喷嘴气泡的生成及聚并行为,得到稳定状态下3种不同的气泡流型:1两喷嘴处的气泡在生成过程中发生聚并;2两喷嘴处的气泡交替生成并发生在线聚并;3两喷嘴处的气泡几乎同时生成,在上升过程中由相互吸引变为相互排斥,无聚并现象发生。第1、2种流型中,先前生成气泡的尾流会对正在生成的气泡产生显著影响,使气泡倾向液体流动的方向生成;第3种流型中,气泡间因涡流重叠面积的不同和液相惯性力作用,在上升过程中由开始的相互吸引逐渐变为相互排斥。
The formation and coalescence behaviors of continuous bubbles generated by double-nozzle in the power law non-Newtonian fluid were numerically simulated by volume of fluid （VOF） coupled with continuous surface force （CSF） method. Three kinds of bubble flow patterns were obtained under the steady state： ①direct coalescence of bubbles before pinch-off; ②bubbles formation alternative in two nozzles then in-line coalescence ;③bubbles formation almost simultaneous, from inter-attraction to mutual repulsion in rising process, no occurrence of bubble coalescence. In the first and second flow patterns, the forming bubbles should be remarkably influenced by the wake flow of foregoing bubbles and inclined towards the direction of fluid flow. In the third flow pattern, the interaction between two parallel bubbles evolved from inter-attraction to mutual repulsion in rising process due to the difference of overlapping areas of bubbles vortex and the liquid inertia force action.
出处
《化学工程》
CAS
CSCD
北大核心
2016年第8期37-41,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(91434204
21306127
21076139)
关键词
双喷嘴
气泡
流型
聚并
非牛顿流体
double-nozzle
bubble
flow pattern
coalescence
non-Newtonian fluids
