한국가시화정보학회지 (Journal of the Korean Society of Visualization)

  • 제15권2호
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  • Pages.59-67
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  • 2017
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  • 1598-8430(pISSN)
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  • 2093-808X(eISSN)
한국가시화정보학회 (The Korean Society of Visualization)
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공기구동 이젝터를 이용한 ABB (Air Bubble Barrier)의 기포거동 특성 연구 (II): 기포거동 특성의 비교 분석

A Study on Bubble Behavior Generated by an Air-driven Ejector for ABB (Air Bubble Barrier) (II): Comparison of Bubble Behavior with and without Ejector

  • Seo, Hyunduk (School of Mechanical Engineering, Pusan National University) ;
  • Aliyu, Aliyu Musa (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Hyogeum (Infra & Offshore Research Team, GS Engineering & Construction) ;
  • Kim, Kyung Chun (School of Mechanical Engineering, Pusan National University)
  • 투고 : 2017.08.12
  • 심사 : 2017.08.29
  • 발행 : 2017.08.31
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초록

To verify floatability of ABB (Air bubble barrier), we compared bubble swarm behavior with and without the air-driven ejector. Experiment was conducted using the fabricated air-driven ejector with 5 mm nozzle on the bottom of 1 m3 water tank. Reynolds number of air in the nozzle was ranged 1766-13248. We analyzed data with statistical method using image processing, particle mage velocimetry (PIV) and proper orthogonal decomposition (POD) analysis. As a result of POD analysis, there was no significant eigenmode in bubbly flow generated from the ejector. It means that more complex turbulent flows were formed by the ejector, thereby (1) making bubbles finer, (2) promoting three-dimensional energy transfer between bubble and water, and (3) making evenly distributed velocity profile of water. It is concluded that the air-driven ejector could enhance the performance of ABB.

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참고문헌

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