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공기구동 이젝터를 이용한 ABB (Air Bubble Barrier)의 기포거동 특성 연구 (Ⅱ)
서현덕(Hyunduk Seo),알리유 무사 알리유(Aliyu Musa Aliyu),김효근(Hyogeum Kim),김경천(Kyung Chun Kim) 한국가시화정보학회 2017 한국가시화정보학회지 Vol.15 No.2
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.