文丘里式气泡发生器内气泡输运过程研究  

Investigation of Bubble Transportation in Venturi-type Bubble Generator

作　　者：莫政宇[1] 杜敏[1] 邵梓一 谢果[1] 刘洪涛[1] 孙立成[1] 

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》2016年第6期1034-1039,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(51376052,51106101);四川大学大学生创新创业训练计划资助项目(201510610519)

摘　　要：利用可视化方法研究文丘里式气泡发生器内气泡的输运和破碎过程。实验以水和空气为工质,水流量范围为15～20m3/h,气流量范围为0.6～0.7L/min,空泡份额在0.2%～0.3%之间。结果表明：不同于常规通道,气泡在从文丘里管喉部流出后具有一个明显的减速过程,使得气液相对速度随之增加,该减速过程对气泡变形和破碎存在极大影响;水流量对气泡的破碎位置无明显影响,气泡破碎位置通常发生在渐扩段距喉部8～10mm左右的范围,处于壁面涡流区与主流的交界附近。The visualized study was carried out involving the transportation and breakup process in a Venturi-type bubble generator.The air and water were used as working fluids with volumetric flow rates of 15-20 m3/h and 0.6-0.7 L/min,respectively in experiment,resulting in a void fraction in the range of 0.2%-0.3%.The results show that being different from that of a conventional channel,bubbles are decelerated rapidly after flowing out of the throat for Venturi tube,leading to a larger difference of velocities between the gas and liquid.This must have a significant effect on the deformation and breakup of bubbles.The water flow rate has little effect on the position of bubble breakup which is always at a distance from the throat about 8-10 mm and near the boundary between the vortex region and main stream.

关 键 词：文丘里式气泡发生器 气泡碎化 空泡份额 漂移流模型 平均直径 

分 类 号：TL334[核科学技术—核技术及应用]