Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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An Experimental Study on the Orifice Nozzle System that Generates Micro-bubbles by Self-suction of Air with a Recirculating Flow

재순환 유동 공기 자가흡입에 의한 마이크로버블 발생 오리피스 노즐 시스템에 대한 실험적 연구

  • 오신일 (금오공과대학교 기계공학과 대학원) ;
  • 박상희 (금오공과대학교 기계공학과)
  • Received : 2017.11.10
  • Accepted : 2018.12.08
  • Published : 2018.02.28
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Abstract

An experimental study was performed on the orifice nozzle system that generates micro-bubbles by air self-suction using a venturi nozzle. This study experimentally investigates the amount of air sucked into the venturi nozzle and the number of micro-bubbles generated by the orifice nozzle system in Cases 1 and 2. The experimental conditions were varied by changing the diameter of the orifice nozzle (d=2~7 mm) and the number of holes of the perforated plate nozzle (n = 2-12). In Case 1, the air self-suction was more than 2 LPM at $d{\leq}4mm$. When d = 4 mm, the total number of bubbles was 29,777, and it was confirmed that micro-bubbles occupied approximately 65% of the total number of bubbles. In Case 2, the air self-suction was maintained constant at approximately 2.5 LPM regardless of the number (n) of holes. The total amount of bubbles increased when n increased but remained constant at approximately 44,000 when $n{\geq}7EA$. It was also confirmed that more than 80% of all bubbles were micro-bubbles when $n{\geq}10EA$. Thus, the number of micro-bubbles increased by approximately 15% compared to the experimental result of Case 1, which was optimized with d = 4 mm.

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Acknowledgement

Supported by : 금오공과대학교

References

  1. Liu, S., et al., "Effects of nanobubbles on the physicochemical properties of water: The basis for peculiar properties of water containing nanobubbles,"Chemical Engineering Science, 93, 250-256, 2013. https://doi.org/10.1016/j.ces.2013.02.004
  2. Kim, M. Y. et al., "Effects of Physical -Chemical Characteristics of Micro bubbles and Particles on Removal Efficiency in Electro-Flotation" Journal of The Korean Society of Civil Engineers, 25, pp. 535-538, 2005.
  3. Kim, H. I. et al., "Numerical Study of Design of Micro Bubble Generation Nozzle" Trans. of the Korean Society of Mech. Engineers, A-36(12), pp.1643-1651, 2012.
  4. Park, S. C. et al., "An Effect of the Micro Bubble Formation Depending on the Saturator and the Nozzle in the Dissolved Air Flotation System" Journal of Korean Society Of Environmental Engineers, E-35(12), pp.929-936, 2013.
  5. Kwak, G. T. et al., "An experimental study on the Vortex nozzle for generating micro-bubble by air self-suction" Journal of the Korean Society of Manufacturing Process Engineers, Vol. 14, No. 1, pp.98-104, 2015. https://doi.org/10.14775/ksmpe.2015.14.1.098
  6. Lim, J. Y. et al., "Evaluation of Characteristics for Microbubble Generation According to Venturi Nozzle Specification" Journal of the Korean Academia-Industrial Cooperation Society, Vol. 16, No. 9, 6397-6402, 2015. https://doi.org/10.5762/KAIS.2015.16.9.6397