Numerical experimentation of bottom screens with circular bars transverse to the flow.
Keywords:
circular bars, ANSYS, Froude, coanda effect, transverse screensAbstract
This study presents the results of numerical experimentation of bottom screens with circular bars
transverse to the flow. The geometries, meshes and calculation conditions were based on
previously calibrated high-precision models. The simulations were performed using the CFD code
ANSYS 2020 R1 for inlet flows to the system Q = 2,0, 2,5 and 3.0 l/s, locating the screen in the upper
zone of the channel. A bar diameter of 3 mm was used, and different angles of inclination of the
screens θ = 20°, 35° and 45° were evaluated, with separations between bars h = 1 and 2 mm. The
initial simulations of the flow without screens provided the inlet conditions for the proposed
screen prototypes. From the simulations, the flow velocity, pressure and flow fields captured by
each slot could be obtained. It is shown that for Q= 2,5 l/s and θ= 35° the highest captured flow
rates and capture efficiency are obtained, also that with the increase in spacing between bars the
captured flow rate increases up to 42,59%.
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