均匀直流电场作用下液滴成桥现象  

Liquid Bridge Formed by Droplets Under Uniform DC Electric Field

作　　者：李典 王太 陈烁 刘清元 谢英柏[1] 刘春涛[1] LI Dian;WANG Tai;CHEN Shuo;LIU Qingyuan;XIE Yingbai;LIU Chuntao(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,保定071003

出　　处：《高电压技术》2021年第12期4396-4403,共8页High Voltage Engineering

基　　金：河北省自然科学基金(E2019502151);中央高校基本科研业务费专项资金资助(2018MS105)。

摘　　要：电场作用下液桥的生成多出现于变压器、油水分离器和电破乳设备中,其造成的放电现象对设备的正常使用及寿命有很大的影响。为了研究均匀直流电场作用下液滴成桥的过程与发展,文中设计与搭建了可视化实验系统。通过调整液滴尺寸与电压,开展了多组实验,共观察到3种类型液桥,分别为柱状液桥、珍珠链状液桥、柱帽状液桥。柱状液桥现象中,1条长液柱连接上下极板,但持续时间较短,液柱破碎后,形成一个大液滴,位于极板之间。珍珠链状液桥现象中,一定数量的液滴像珍珠项链一样串联在一起,持续时间较长,相邻液滴之间存在电火花,放电的发生会导致液桥破碎并伴随着气泡的生成。柱帽状液桥现象中,短液柱与置于下极板上的大液滴相连,短液柱很快断裂,持续时间较短。Liquid bridge is often formed in transformer,oil-water separator and electric demulsifier under the action of electric field.The discharge phenomenon caused by the liquid bridge has a great influence on the normal operation and service life of equipment.In order to study the process and development of droplet bridging under a uniform DC electric field,a visual experimental system was designed and built.A number of experiments were carried out by changing the droplet size and voltage,and three types of liquid bridges,namely,columnar liquid bridge,pearl chain liquid bridge,and column cap liquid bridge,were observed.In the columnar liquid bridge phenomenon,a long liquid column connects the upper and lower plates,but the duration is short.After the liquid bridge broken,a large droplet is formed between the plates.In the phenomenon of pearl chain liquid bridge,a number of droplets are connected in series like a pearl necklace and last for a long time.There will be electric sparks between adjacent droplets.The discharge will lead to the breakup of droplet bridge and the formation of bubbles.In the columnar cap liquid bridge phenomenon,the short liquid column is connected with the large droplet placed on the lower plate,and the short liquid column breaks up quickly and lasts for a short time.

关 键 词：多相流 流体动力学 液滴 液桥 均匀电场 

分 类 号：O552.42[理学—热学与物质分子运动论]