Development of a capillary plasma pump with vapour bubble for water purification: Experimental and theoretical investigation

S. Uehara, K. Ishihata, H. Nishiyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper describes the development of a small-sized reactive plasma pump driven by capillary bubble discharge for the purification of treated water. The apparatus we developed decomposes the pollutants in the water by using chemical species generated by the plasma discharge. The resulting stream of bubbles obviates the need for an external gas supply or pump to transport the water. A high-speed camera was used to investigate the bubble dynamics responsible for the pumping effect, which is achieved by selecting the shape of the capillary such that the bubble ejections within enhance the 'self-repetition' action required for the pumping motion. Our experiments showed that optimal bubble generation requires a consumed power of 17.8 W. A theoretical model was developed to investigate the pumping mechanism. We solve the problems associated with liquid oscillations in the U-shaped water reservoir by employing a non-uniform cross-sectional area in our model. The chemical reactivity of the device was confirmed by using emission spectroscopy of OH radical and by measuring the decomposition of methylene blue.

Original languageEnglish
Article number405202
JournalJournal of Physics D: Applied Physics
Volume49
Issue number40
DOIs
Publication statusPublished - 2016 Sep 12

Keywords

  • capillary discharge
  • methylene blue decomposition
  • small-sized pump
  • vapour bubble
  • water purification

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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