摘要
对孔径为0.054 mm的淹没微孔处气泡的形成及运动特性进行了可视化实验,通过高速摄影得到了气泡形成过程中的实时图片,并对运动过程中的气泡边界进行了捕捉,获得了气泡在形成过程中的形变及运动特征。实验结果表明:气泡的整个形成及运动过程可根据气泡形态的变化分为生长、聚并、振荡和稳定四个阶段,各阶段气泡尺寸及高宽比的变化规律不同;气泡聚并阶段中高宽比出现增强型波动趋势,而在振荡阶段则相反;气体流量的增大减小了气泡形成时间,增大了聚并及振荡时间。
The formation of 0.054 mm immersed in and movement of bubble emerging from a micro-orifice with diameter liquid are investigated experimentally. The bubble formation process is recorded by high-speed camera and the characteristics of bubble formation and movement are obtained by image processing and bubble tracking methods. The results show that the process of bubble formation and movement experiences four stages： growth stage, coalescence stage, oscillating stage and stabilization stage. The bubble size and deformation are obtained in each stage. The bubble aspect ratio fluctuation is amplified during the coalescence stage, which is conversely in the oscillation stage. With the increasing of gas flow rate, the bubble growth time decreases, but the duration of coalescence and oscillation stages increase.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第2期282-285,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.50876119)
研究生科技创新基金重点项目(No.CDJXS10142223)
关键词
微孔
气泡生长
气泡运动
边界跟踪
可视化实验
micro-orifice
bubble formation
bubble movement
bubble tracking
visualization
