Time-resolved PIV와 POD기법을 이용한 단일노즐 버블링 유동 특성에 관한 연구 (CHARACTERISTICS OF BUBBLE-DRIVEN FLOW BY USING TIME-RESOLVED PIV AND POD TECHNIQUE)

서지정보

· 발행기관 : 한국가시화정보학회
· 수록지 정보 : 한국가시화정보학회지 / 6권 / 1호 / 41 ~ 46페이지
· 저자명 : 김경천, 김현동, 이승재, 김종욱

초록

In this paper, the recirculation flow motion and mixing characteristics driven by air bubble stream in a rectangular water tank is studied. The time-resolved PIV technique is adopted for the quantitative visualization and analysis. 488nm Ar-ion CW laser is used for illumination and orange fluorescent (λex = 540nm, λem = 560nm) particle images are acquired by a PCO 10bit high-speed CCD camera (1280 x 1024). To obtain clean particle images, 545nm long pass optical filter and an image intensifier are employed and the flow rates of compressed air is 3ℓ/min at 0.5MPa. The recirculation and mixing flow field is further investigated by time-resolved POD analysis technique. It is observed that the large scale recirculation resulting from the interaction between rising bubble stream and side wall is the most dominant flow structure and there are small scale vortex structures moving along with large scale recirculation flow. It is also verified that the sum of 20 modes of velocity field has about 67.4% of total turbulent energy.Flow Visualization(유동가시화), Time-Resolved PIV(시분할 입자영상유속계), Proper Orthogonal Decomposition(적합직교분해), Bubble mixing(기포혼합)

영어초록

In this paper, the recirculation flow motion and mixing characteristics driven by air bubble stream in a rectangular water tank is studied. The time-resolved PIV technique is adopted for the quantitative visualization and analysis. 488nm Ar-ion CW laser is used for illumination and orange fluorescent (λex = 540nm, λem = 560nm) particle images are acquired by a PCO 10bit high-speed CCD camera (1280 x 1024). To obtain clean particle images, 545nm long pass optical filter and an image intensifier are employed and the flow rates of compressed air is 3ℓ/min at 0.5MPa. The recirculation and mixing flow field is further investigated by time-resolved POD analysis technique. It is observed that the large scale recirculation resulting from the interaction between rising bubble stream and side wall is the most dominant flow structure and there are small scale vortex structures moving along with large scale recirculation flow. It is also verified that the sum of 20 modes of velocity field has about 67.4% of total turbulent energy.Flow Visualization(유동가시화), Time-Resolved PIV(시분할 입자영상유속계), Proper Orthogonal Decomposition(적합직교분해), Bubble mixing(기포혼합)

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