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오진호(Jinho Oh),신형민(Hyungmin Shin),서현덕(Hyunduk Seo),김경천(Kyung Chun Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Behaviors of the jellyfish subjected to bubble swarm are investigated in this study. Bubble driven steady flow is formed in a 0.5 m x 0.5 m x 0.5 m acrylic tank. Particle Image Velocimetry (PIV) is used to measure the steady flow in the tank. Surface current from bubble swarm generates a vortex near the wall of the tank and the maximum velocity of the vortex towards the bubble is about 4.5 mm/s. Two perpendicularly installed cameras capture the motion of jellyfish. Time-resolved 3-D reconstruction of the position of the jellyfish is achieved by considering angle of view. In the vortex region, the jellyfish is entrained to bubble depending on the direction of the jellyfish bell. Being entrained to bubble, the jellyfish is rotated by the vortex and swims obliquely towards direction of the jellyfish bell. The result shows that we can design bubble barrier to prevent jellyfish crown at the power plant intake.