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Noncontact rebound and fission of oppositely charged droplets

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Abstract

Oppositely charged droplets rebound and break up under high enough electrical fields before they contact each other. By using high-speed microscopy, we present a detailed experimental study of the noncontact bouncing and breakup process of oppositely charged droplets for liquids of different conductivities. Under different applied voltages, the breakup morphology of oppositely charged droplets with various ion concentrations has been accurately captured, and an image-processing technology was used to analyze the effect of several parameters on the breakup process. The breakup structures based on ion concentrations were measured to build up their relationship to study the dynamic behavior of oppositely charged droplets. For poorly conducting or nonconducting liquids, no breakup behavior was observed regardless of the applied voltage. However, various breakup structures are detected as the applied voltage increases for high-conductivity liquids. The behavior of bouncing without breakup is caused by air discharge, which is achieved prior to the ion concentration on the droplet tip reaching the Rayleigh charge limit. The behavior of bouncing with breakup is a form of Coulomb fission, which means that the surface charge on the droplet tip reaches the Rayleigh charge limit prior to air discharge. The fitting curves are given to demarcate bouncing and breakup behaviors. Droplets with high conductivity exhibit the maximum change in breakup volume, indicating that high-conductivity liquids are more sensitive to changes in electric field strength.

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References

  • Bird JC, Ristenpart WD, Belmonte A et al (2009) Critical angle for electrically driven coalescence of two conical droplets. Phys Rev Lett 103(16):164502

    Article  Google Scholar 

  • Chen G, Tan P, Chen S et al (2013) Coalescence of Pickering emulsion droplets induced by an electric field. Phys Rev Lett 110(6):064502

    Article  Google Scholar 

  • Hamlin BS, Creasey JC, Ristenpart WD (2012) Electrically tunable partial coalescence of oppositely charged drops. Phys Rev Lett 109(9):094501

    Article  Google Scholar 

  • Helmensdorfer S, Topping P (2013) Bouncing of charged droplets: an explanation using mean curvature flow. arXiv preprint arXiv:1302.4862

  • Huo YP, Wang JF, Mao WL et al (2012) Measurement and investigation on the deformation and air-assisted breakup of charged droplet. Flow Meas Instrum 27:92–98

    Article  Google Scholar 

  • Impey RW, Madden PA, McDonald IR (1983) Hydration and mobility of ions in solution. J Phys Chem 87(25):5071–5083

    Article  Google Scholar 

  • Kim HH, Kim JH, Ogata A (2011) Time-resolved high-speed camera observation of electrospray. Aerosol Sci 42:249–263

    Article  Google Scholar 

  • Koneshan S, Rasaiah JC, Lynden-Bell RM et al (1998) Solvent structure, dynamics, and ion mobility in aqueous solutions at 25 °C. J Phys Chem B 102(21):4193–4204

    Article  Google Scholar 

  • Lee MW, Kang DK, Yoon SS et al (2012) Coalescence of two drops on partially wettable substrates. Langmuir 28(8):3791–3798

    Article  Google Scholar 

  • Lee MW, Latthe SS, Yarin AL et al (2013) Dynamic electrowetting-on-dielectric (DEWOD) on unstretched and stretched teflon. Langmuir 29(25):7758–7767

    Article  Google Scholar 

  • Liu T, Seiffert S, Thiele J et al (2012) Non-coalescence of oppositely charged droplets in pH-sensitive emulsions. Proc Natl Acad Sci 109(2):384–389

    Article  Google Scholar 

  • Mugele F (2009) Fluid dynamics: to merge or not to merge. Nature 461(7262):356

    Article  Google Scholar 

  • Rayleigh L (1882) On the equilibrium of liquid conducting masses charged with electricity. Philos Mag 14:184–186

    Article  Google Scholar 

  • Ristenpart WD, Bird JC, Belmonte A et al (2009) Non-coalescence of oppositely charged drops. Nature 461(7262):377–380

    Article  Google Scholar 

  • Shrimpton JS (2005) Dielectric charged drop break-up at sub-Rayleigh limit conditions. IEEE Trans Dielectr Electr Insul 12(3):73–578

    Article  Google Scholar 

  • Tang K, Gomez A (1994) Charge and fission of droplets in electrostatic sprays. Phys Fluids 6(1):404–414

    Article  Google Scholar 

  • Wang JF (2002) A fundamental investigation on electrospray combustion-investigation on electrospray of fuel and charged two phase turbulent jet flow. Dissertation, Jiangsu University, Zhenjiang

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Acknowledgments

This research was supported by NSFC 51376084, 51006047, and GSIPJP CXZZ13_0676. The authors appreciate their support for this work.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Yuanping Huo, Junfeng Wang, Ziwen Zuo & Yajun Fan

  2. Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong, People’s Republic of China

    Huihe Qiu

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  1. Yuanping Huo
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  2. Junfeng Wang
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  3. Huihe Qiu
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  4. Ziwen Zuo
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  5. Yajun Fan
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Correspondence to Junfeng Wang.

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Huo, Y., Wang, J., Qiu, H. et al. Noncontact rebound and fission of oppositely charged droplets. Exp Fluids 56, 65 (2015). https://doi.org/10.1007/s00348-015-1931-9

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  • DOI: https://doi.org/10.1007/s00348-015-1931-9

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