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Received January 21, 2021
Accepted March 3, 2021
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Coalescence of Two Oppositely Charged Droplets at Constant Electric Potential
Energy and Environment Laboratory, Kepco Research Institute, 105 Munji-Ro, Yuseong-Gu, Daejeon, 34056, Korea 1Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-ro., Nam-gu, Pohang, Gyeongbuk, 37673, Korea
iskang@postech.ac.kr
Korean Chemical Engineering Research, May 2021, 59(2), 247-253(7), 10.9713/kcer.2021.59.2.247 Epub 3 May 2021
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Abstract
Electrocoalescence is an active technique in petroleum industry, formation of raindrop in cloud, and digital microfluidics. In the present work, electrocoalescence of two droplets under the constant electric potential in air was studied. Through this experiment, we found that the electrocoalescence process could be divided three phases; deformation, formation of liquid bridge, and merging. And the condition for formation of liquid bridge between two droplets was obtained. For the connection of experimental result in constant potential condition with general case in constant charge condition, relationship of charge and potential difference was deduced by numerical computation. In high electric potential case, flat interfaces after recoiling were observed. It was interpreted through a numerical simulation of electric field.
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References
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Ristenpart WD, et al., Nature, 461, 377 (2009)
Bird JC, et al., Phys. Rev. Lett., 103(16), 164502 (2009)
Mugele F, Nature, 461, 356 (2009)
Pierre A, Aitken F, IEEE Trans. Ind. Appl., 46(4), 1578 (2010)
Pierre A, Lundgaard L, Berg G, J. Electrostat., 64(7), 550 (2006)
John L, Roxburgh IW, Proc. R. Soc. A, 295, 84 (1966)
Atten P, J. Electrostat., 30, 259 (1993)
Davis MH, Q. J. Mech. Appl. Math., 17(4), 499 (1964)
