2022 Volume 55 Issue 2 Pages 92-96
An inside baffle which was placed inside a vessel with a clearance between the baffle and the vessel wall has been developed to draw down the floating solids into the liquid effectively. The drawdown performance of floating solids into the liquid was investigated under four baffle conditions: no baffle condition, standard baffle condition, surface baffle on the wall condition, and inside surface baffle condition. The minimum impeller rotational speed for the complete suspension of floating solid NJD was measured visually under all the baffle conditions. Particle image velocimetry (PIV) was conducted to measure the velocity field. The volumetric power consumption PV, JD at NJD, was measured. As a result, NJD under the inside surface baffle condition was the lowest at an impeller position near the vessel bottom. Moreover, PV, JD under the inside surface baffle condition was the lowest among all the baffle conditions at all impeller positions.