Observations of flow patterns in a model of a marine fish larvae rearing tank |
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| Institution: | 1. School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China;2. Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, Hong Kong;1. Key Laboratory of Environment Controlled Aquaculture (Dalian Ocean University), Ministry of Education, 52 Heishijiao Street, Dalian 116023, PR China;2. College of Marine Technology and Environment, Dalian Ocean University, 52 Heishijiao Street, Dalian 116023, PR China;3. College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China;4. Hubei International Science and Technology Cooperation Base of Fish Passage, Three Gorges University, Yichang 443002, China;1. Biotechnology Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China;2. State Key Laboratory of Large Yellow Croaker Breeding, Ningde 352103, China;3. Ningbo University, Ningbo 315211, China |
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| Abstract: | There are few studies on flow fields generated by aerators in fish larvae rearing tanks. The flow varies with aeration rates and tank proportions resulting in different larvae survival rates. The effects of aeration rate and aspect ratio AR (the ratio of liquid depth to tank radius) on overall flow patterns were investigated experimentally using flow visualization techniques. Two distinct types of flow patterns, a single-pair vortex system and a two-pair vortex system, were observed as the value of tank aspect ratio varied from about 1.0 to 2.0. In addition, corner vortex structures were observed in both the region between the free surface and the upper sidewall, and between the bottom wall and the lower sidewall of the tank. On the sidewall, reattachment and separation points were found, which were closely related with these vortex structures. |
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| Keywords: | Flow pattern Aspect ratio Rearing tank Flow visualization Topology Larviculture |
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