电场作用下气泡分散特性的实验研究  

Experimental Investigation on Bubble Dispersion Under Electric Field

作　　者：王军锋[1] 胡巍瀚 刘海龙[1] 霍元平[1] 王东保 WANG Junfeng;HU Weihan;LIU Hailong;HUO Yuanping;WANG Dongbao(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学能源与动力工程学院

出　　处：《高电压技术》2019年第11期3736-3742,共7页High Voltage Engineering

基　　金：国家自然科学基金国际合作与交流项目(51761145011);国家自然科学基金(51506078)~~

摘　　要：电场能有效强化多相系统相间分散及传热传质,气泡的形貌和尺寸是影响其分散效果和传热传质效率的重要因素。为此搭建荷电液气多相系统气泡生长和分散实验台,利用显微高速摄像技术对非均匀电场作用下空气在乙醇中的分散过程进行可视化研究,捕捉气泡在生长和分散过程中的显微形貌特征,通过改变电极形式、电压、流量,研究各因素对气泡生长状态及气泡尺寸的影响。实验结果表明:随着电压增加,空气在乙醇中的分散模式依次为单气泡模式、混合模式、喷雾模式及电晕模式,在达到电晕模式之前,气泡尺寸随电压增加而减小;在喷雾模式下,气体破碎形成大量微气泡,能够有效增加液气两相接触面积,强化相间分散;气泡尺寸具有较好的可控性,建立的数学模型可以准确地预测气泡尺寸。该研究结果为实现电场调控气泡尺寸及强化液气多相系统相间分散,发展高效节能的相分散技术提供研究基础。Electric field can effectively enhance the dispersion and heat and mass transfer of multiphase systems.The shape and size of bubbles are important factors that affect the dispersion and heat and mass transfer efficiency.Consequently,we set up an experiment platform for bubble growth,and used the micro high-speed camera technology to visualize the dispersion process of air in ethanol under the action of non-uniform electric field.The micromorphology characteristics of bubbles were captured in the process of growth and dispersion.The effects of various factors on the bubble growth state and the bubble size were studied by changing the electrode configuration,voltage and air flow rate.The experimental results show that,as the voltage increases,the dispersion mode of air in ethanol occurs in the following order:the dripping mode,mixed mode,spraying mode,and corona mode.The bubble size decreases with the increase of the voltage before reaching the corona mode.In the spraying mode,the gas is broken into a large number of microbubbles,which can effectively increase the liquid-gas two phase contact area and strengthen the dispersion.The bubble size is of great controllability,and the mathematical model established can accurately predict the bubble size.The research results provide a basis for realizing the electric field controlling bubble size,enhancing the dispersion of liquid-gas multiphase systems,and developing efficient and energy-saving dispersion technology.

关 键 词：液气两相系统 非均匀电场 气泡破碎 显微高速摄像 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TM152[动力工程及工程热物理—热能工程]