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Influence of water conductivity on particular electrospray modes with dc corona discharge — optical visualization approach

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Abstract

The effect of water conductivity on electrospraying of water was studied in combination with positive DC corona discharge generated in air. We used a point-to-plane geometry of electrodes with a hollow syringe needle anode opposite to the metal mesh cathode. We employed total average current measurements and high-speed camera fast time-resolved imaging. We visualized the formation of a water jet (filament) and investigated corona discharge behavior for various water conductivities. Depending on the conductivity, various jet properties were observed: pointy, prolonged, and fast spreading water filaments for lower conductivity; in contrast to rounder, broader, and shorter quickly disintegrating filaments for higher conductivity. The large acceleration values (4060 m/s2 and 520 m/s2 for 2 μS/cm and 400 μS/cm, respectively) indicate that the process is mainly governed by the electrostatic force. In addition, with increasing conductivity, the breakdown voltage for corona-to-spark transition was decreasing.

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Authors and Affiliations

  1. Division of Environmental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48, Bratislava, Slovakia

    Branislav Pongrác & Zdenko Machala

  2. Institute for Environmental Management Technology, AIST, Tsukuba, Japan

    Branislav Pongrác, Hyun-Ha Kim & Nobuaki Negishi

Authors
  1. Branislav Pongrác
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  2. Hyun-Ha Kim
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  3. Nobuaki Negishi
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  4. Zdenko Machala
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Correspondence to Branislav Pongrác.

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Pongrác, B., Kim, HH., Negishi, N. et al. Influence of water conductivity on particular electrospray modes with dc corona discharge — optical visualization approach. Eur. Phys. J. D 68, 224 (2014). https://doi.org/10.1140/epjd/e2014-50052-4

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  • DOI: https://doi.org/10.1140/epjd/e2014-50052-4

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