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Abstract

To improve the space utilization rate of aquaculture tanks in aquaculture facilities and investigate the effect of the length-width ratio parameter (abbr. L/W, with L being the length of the tank and W being its width) on the particle collection and discharge characteristics of the rounded rectangle aquaculture tank with diagonal double inlet pipes. The study simulates the particle discharge procedure of the tank using a solidliquid two-phase numerical model (discrete phase model and RNG k-ε turbulence model adopted). The validity of the numerical model was confirmed through physical experiments. The simulation results for two jet condition indicate that when L/W is between 1~1.5, all tanks have similar level of particle exclusion and particle discharge efficiency and have over 95% particle discharge rate. When L/W is between 1.6~1.7, widthways-jet condition aquaculture tank has a better performance on particle exclusion than lengthways-jet condition. The tank particle exclusion efficiency is low when L/W is between 1.8~1.9 and the tank sewage effect is poor. This study provides a theoretical reference for sewage disposal investigation in circulating water aquaculture tanks with larger length-width ratio.1

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