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Dynamics of droplet formation with oscillation of meniscus in electric periodic dripping regime
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.expthermflusci.2020.110250
Zhentao Wang , Yaosheng Zhang , Qisi Wang , Kai Dong , Shiqi Yang , Yimin Jiang , Jun Zheng , Bin Li , Yuanping Huo , Xiaoying Wang , Junfeng Wang , Jiyuan Tu

Abstract The dynamics of droplets and oscillation of electrified meniscus at low flow rates in an external electric field were investigated. An electric field is created by nozzle-plated electrode. The evolution of droplet formation is recorded by a high-speed digital camera. Meanwhile, the time evolution of meniscus is also focused. The critical sizes of the droplet and liquid thread were used to characterize the dynamics of droplet formation and oscillation of the meniscus. The results showed that a droplet gradually originates from a hemispherical meniscus and changes from spherical to pear-shaped. A liquid thread connects the meniscus and primary droplet, and pinches off as time advances. The droplets diameter decreases as electric potential increasing and is dependent of capillary diameter, while usually independent of flow rates. The droplet limiting length decreases, while the liquid thread diameter increases as electric Bond number increasing. The period of detachment decreases with an increase in electric potential and strongly depends on flow rate. The meniscus usually oscillates when the primary droplet detaches. The oscillation frequency increases as electric field strength increasing and is substantially affected by flow rate. An approximate equation to predict the oscillation frequency was presented, where the electric potential was taken into account. The variation of the oscillation frequency is qualitatively good agreement with experimental work. The amplitude of oscillation (or displacement) is significantly affected by electric field and increases as electric Bond number increasing.

中文翻译:

电周期滴液中弯液面振荡的液滴形成动力学

摘要 研究了外电场中低流速下液滴的动力学和带电弯液面的振荡。电场由喷嘴电镀电极产生。高速数码相机记录液滴形成的演变过程。同时,弯月面的时间演变也受到关注。液滴和液体线的临界尺寸用于表征液滴形成和弯液面振荡的动力学。结果表明,液滴逐渐起源于半球形弯月面,并由球形变为梨形。一条液体线连接弯月面和初级液滴,并随着时间的推移而收缩。液滴直径随着电势的增加而减小,并且取决于毛细管直径,而通常与流速无关。随着电键数的增加,液滴极限长度减小,而液体线直径增加。脱离的时间随着电势的增加而减少并且强烈依赖于流速。当初级液滴分离时,弯液面通常会振荡。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。而液体线径随着电键数的增加而增加。脱离的时间随着电势的增加而减少并且强烈依赖于流速。当初级液滴分离时,弯液面通常会振荡。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。而液体线径随着电键数的增加而增加。脱离的时间随着电势的增加而减少并且强烈依赖于流速。当初级液滴分离时,弯液面通常会振荡。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。脱离的时间随着电势的增加而减少并且强烈依赖于流速。当初级液滴分离时,弯液面通常会振荡。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。脱离的时间随着电势的增加而减少并且强烈依赖于流速。当初级液滴分离时,弯液面通常会振荡。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。振荡频率随着电场强度的增加而增加,并且受到流速的显着影响。提出了一个预测振荡频率的近似方程,其中考虑了电势。振荡频率的变化与实验工作在质量上非常吻合。振荡(或位移)的幅度受电场的影响很大,并且随着电键数的增加而增加。
更新日期:2021-01-01
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