摘要
本文利用双平行探针技术和摄像方法对水平直管内气液两相流中单气泡的形态特征进行了实验研究。实验结果表明气泡头部和气泡体的形态特征取决于气液混合Fr数,而气泡的尾部特征还与气泡长度有关;气泡的头部结构特征决定气泡的移动特性,而气泡的尾部结构特征决定气泡向液塞区的充气特性:小气泡通过单纯水跃面的气泡尾部向液塞区弥散,而具有阶梯状尾部结构的气泡并不向随后的液塞区弥散小气泡,所以气泡尾部的结构特征的变化决定了弹状流与段塞流的转变。
An experimental study of the shape of a single bubble similar to those observed in horizontal plug/slug flow was performed by visual observation and conductance probes in this paper. The results show that the shape of the nose and body of bubble depends on the Froude number defined by gas/liquid mixture velocity, whereas the shape of the back region of bubble depends on both the Froude number and bubble length. The photographic pictures show that the motion of bubble is related to the characteristics of bubble head and the transition from plug flow to slug flow occurs when the back of the bubble changes from staircase to hydraulic jump pattern with increasing the Froude number and bubble length.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2006年第3期433-436,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目资助(No.50536020)
优秀重点实验室奖励研究项目(No.50323001)
关键词
气弹形状
弹状流
段塞流
混合Fr数
bubble shape
slug flow
plug flow
flow pattern transition
