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Time-resolved PIV와 POD기법을 이용한 유량에 따른 단일노즐 버블링 유동 특성에 관한 연구
이승재(Seung Jae Yi),김종욱(Jong Wook Kim),김현동(Hyun Dong Kim),김경천(Kyung Chun Kim) 한국가시화정보학회 2008 한국가시화정보학회지 Vol.6 No.2
In this paper, the recirculation flow motion and mixing characteristics driven by air bubble flow in a rectangular water tank is studied. The Time-resolved PIV technique is adopted for the quantitative visualization and analysis. 532 ㎚ Diode CW laser is used for illumination and orange fluorescent particle images are acquired by a PCO 10bit high-speed camera. To obtain clean pa.rticle images, 545 ㎚ long pass optical filter and an image intensifier are employed and the flow rates of compressed air is changed from 2 ℓ/min to 4 ℓ/min at 0.5 ㎫. The recirculation and mixing flow field is further investigated by the POD analysis technique. It is observed that the large scale counterclockwise rotation and main vortex is generated in the upper half depth from the free surface and one quarter width from the sidewall. When the flow rates are increased, the main vortex core is moved to the side and bottom wall direction.