生长和浮升过程中气泡形状振荡特性研究  

Bubble Shape Oscillation Characteristic during Its Growth and Rising Process

作　　者：胡瑞 唐继国 李晓 孙立成[1] 刘洪涛[1] HU Rui;TANG Jiguo;LI Xiao;SUN Licheng;LIU Hongtao(State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,水利水电学院,四川成都610065

出　　处：《原子能科学技术》2022年第3期450-456,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金(52076144,51706149,12075160);四川省科技计划(2021YJ0374)。

摘　　要：气泡形状变化对两相流动和热质传递过程有着重要影响。本文利用高速摄像仪和粒子图像测速(PIV)技术对生长和浮升过程中气泡的形状振荡特性进行了实验研究,分析了不同注气流量下气泡形状及其周围流场的变化规律。实验结果表明,气流量对脱离后气泡的形状有着明显影响,在低流量下,脱离气泡逐渐由长椭球形转变为扁椭球形,而在高流量下,脱离气泡与生长气泡的聚合将导致气液界面大幅振荡。此外,振荡气泡对其尾流区内生长气泡形状的影响同样不容忽视,其会引起生长气泡所受惯性作用增强,进而导致气泡形状波动。Variation of bubble shape has a significant effect on two-phase flow, heat and mass transfer process. In this paper, the bubble shape oscillation characteristics in growing and rising process were investigated experimentally using a high-speed video camera and particle image velocimetry(PIV) technique. The variation in the ratio of bubble height to width and its surrounding flow field at different gas injection rates were analyzed. Experimental results show that the gas injection rate has an obvious effect on the shape of departed bubbles. At low gas flow rate, the shape of the departed bubble changes from prolate spheroid to oblate spheroid gradually, while the coalescence of the departed bubble and the growing one leads to the drastic oscillation of bubble surface at high flow rate. In addition, the impact of the oscillated bubble on the shape of a growing bubble in its wake region cannot be neglected as well. The oscillated rising bubble will enhance the inertia effect on the growing bubble and leads to its shape fluctuation.

关 键 词：气泡形状振荡 气泡脱离 气泡生长 流场 粒子图像测速 

分 类 号：TK124[动力工程及工程热物理—工程热物理]