Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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A Study on Bubble Behavior Generated by an Air-driven Ejector for ABB (Air Bubble Barrier) (I): Development of Image Processing Method and Statistical Analysis

공기구동 이젝터를 이용한 ABB (Air Bubble Barrier)의 기포거동 특성 연구 (I): 영상처리 및 통계적분석방법 개발

  • Seo, Hyunduk (School of Mechanical Engineering, Pusan National University) ;
  • Aliyu, Aliyu Musa (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Minkyun (Infra & Offshore Research Team, GS Engineering & Construction) ;
  • Kim, Kyung Chun (School of Mechanical Engineering, Pusan National University)
  • Received : 2017.08.12
  • Accepted : 2017.08.29
  • Published : 2017.08.31
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Abstract

To analyze bubbles generated by an ABB (Air Bubble Barrier), we developed image processing procedure and statistical analysis method. Air was discharged from 5 mm nozzle as swarm form at the bottom of 1 m3 water tank. Flow rates of discharged air are ranged from 2 L/min to 20 L/min and these are corresponding to Reynolds number of 1766-17663. Rise velocity of bubble is extracted by using image process pretending intrusive method. Mean equivalent velocity was calculated using void fraction weighting factor. Bubble diameter is obtained and compared with correlations in the literature. Also, we present a correlation according to the result of this study. Mean velocity and mean diameter of bubbles increase with increasing gas Reynolds number. But these parameters show an asymptotic trend when they approach to high Reynolds number.

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References

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