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
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