Effect of gas ionization on interphase interaction of adjacent oppositely charged droplets
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RESEARCH ARTICLE
Effect of gas ionization on interphase interaction of adjacent oppositely charged droplets Yuanping Huo1 · Cong Zhang1 · Ziwen Zuo1 · Huihe Qiu2 · Junfeng Wang1 Received: 2 July 2020 / Revised: 24 August 2020 / Accepted: 1 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The microscopic evolution behavior of the interphase interaction between adjacent oppositely charged droplets in air and helium environments is investigated. By means of high-speed microscopy with high spatial and high temporal resolution, a special attention has been paid to the interphase morphology characteristics of oppositely charged droplets with different conductivities and applied voltages, and the dynamic evolution behaviors of noncontact bounce and noncontact breakup under the influence of gas ionization are discussed in detail. The results show that noncontact bounce occurs for low-conductivity droplets, whereas noncontact breakup occurs for high-conductivity droplets as the applied voltage increases gradually and that the occurrence of gas-phase ionization and reaching the Rayleigh limit dominate the changes of interphase interaction behaviors. Droplets of high conductivity mean greater minimum pole spacing when the noncontact bounce or breakup behavior occurs. With the increase of conductivity, the voltage required for noncontact breakup gradually decreases, while the occurrence of noncontact breakup behavior in a helium environment is relatedly lagging. Meanwhile, the minimum pole spacing of noncontact breakup is always greater than that in an air environment, and the changes of the minimum pole spacing in air and helium environments indirectly prove that the noncontact bouncing behavior of adjacent charged droplets is induced by gas ionization. Graphic abstract We introduce here the special interphase interaction of adjacent oppositely chargeddroplets. The occurrence of gas-phase ionization and reaching the Rayleigh limitdominate the changes of interphase interaction behaviors, and the significantdifferences of the minimum pole spacing d in air and helium environment indirectlyprove that the noncontact bouncing behavior of adjacent charged droplets is inducedby gas ionization.
* Junfeng Wang [email protected] 1
School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
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Experiments in Fluids
(2020) 61:213
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1 Introduction The dynamic characteristics of adjacent droplets whose charge is induced by an electric field are of basic importance in the field of electrohydrodynamics. Charged droplets have broad application prospects in electrostatic atomization in micro- and nanofilms and particle preparation, micro-multiphase mixing, microcapsule
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