针板电极作用下液体界面不稳定性分析  

Instability analysis of liquid interface under needle plate electrode action

作　　者：王晓英[1] 武识博 王东保 王贞涛[1] 王军锋[1] WANG Xiaoying;WU Shibo;WANG Dongbao;WANG Zhentao;WANG Junfeng(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2020年第5期523-529,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(5176114501);江苏省科技厅自然科学基金资助项目(BK20150511)。

摘　　要：以去离子水为离散相液体,生物柴油为连续相液体,根据界面应力平衡,建立了针板电极作用下离散相液体的色散方程,分析了支配离散相液体变形破碎的界面波特性.采用显微高速摄像技术,对荷电去离子水在生物柴油中的界面形态变化进行了可视化研究,将去离子水在生物柴油中的破碎模式分为滴状模式、摆动滴状模式及锥-摆动射流模式.试验观察了不同模式中的界面波特征,结果表明:滴状模式下仅有轴对称界面波存在;在摆动滴状模式、锥-摆动射流模式中,轴对称界面波与非轴对称界面波共存;随着荷电电压的增大,轴对称界面波与非轴对称界面波的最优波数均增加;轴对称界面波的最优波数大于非轴对称界面波,但其增长倍率小于非轴对称界面波.The deionized water was used as discrete phase liquid with biodiesel as continuous phase liquid.According to the interface stress balance,the dispersion equation of discrete phase liquid under the action of needle plate electrode was established,and the characteristics of the interface wave dominating the breakup of discrete phase liquid were analyzed.The micro-high-speed camera technology was used to visualize the interface morphology of charged deionized water in biodiesel to obtain the breakup mode and formation mechanism of the discrete phase liquid.The results show that the breakup modes of deionized water in biodiesel can be divided into drop mode,swing drop mode and cone-swing jet mode.The observation results of the interface wave characteristics in different modes indicate that in the drop mode,only the axisymmetric wave exists on the interface,while in the swing drop mode and the cone-swing jet mode,the axisymmetric wave coexists with the non-axisymmetric wave.With the increasing of charging voltage,the optimal wave number of the axisymmetric wave and the non-axisymmetric wave is increased.The optimal wave number of the axisymmetric wave is larger than that of the non-axisymmetric wave,but its growth rate is slower than that of the non-axisymmetric wave.

关 键 词：荷电液体 不稳定性 界面波 液液系统 破碎模式 

分 类 号：TK01[动力工程及工程热物理]