Experimental study of flow pattern in rectangular fish breeding ponds

Abstract The current research investigates the flow pattern effect on the performance of rectangular fish breeding ponds based on hydraulic efficiency and stagnant regions indicators. Three different flow patterns (linear, vortex cells with rotation in opposite directions, and vortex cells with rotation in one direction) with various inlet flow momentum forces (0.88N, 0.022N, 0.01N, 0.005N, and 0.003N) were investigated in the present experimental study. A rectangular pond with dimensions of 200×50×13 Cm was also used to conduct the experiments. The results obtained from the flow pattern experimental modelling show the more appropriate performance of the hydraulic condition in flow pattern vortex cells with rotation in opposite directions and vortex cells with rotation in one direction, which were formed by redesign1 and redesign2. The findings from the research show that the linear flow pattern with tested momentum forces does not result in optimal hydraulic efficiency (λ > 0.75). If the vortex cells with rotation in one direction and the vortex cells with rotation in the opposite flow patterns replace with the linear flow pattern, hydraulic efficiency and stagnant regions are optimized in rectangular ponds