Laboratory investigation of the effect of the size of orifice on the performance of curvature submerge vanes for sediment leaching of the vortex settling basin's floor

Abstract

In this paper, considering the accumulation of the sediments on the floor of the vortex settling basin during sediment extracting, curvature submerge vanes were used on the floor of the vortex basin and the effect of the size of the orifice was studied on the performance of the curvature submerge vanes for sediment leaching of the floor of the basin. Experiments were performed on a physical model with a height of 90 cm and a diameter of 206 cm and a floor slope of 10% and also three orifices were used with diameters of 59, 46 and 36 mm. The submerge vanes were placed in different arrangements and different radial sections. The results of the experiments indicated that the performance of the vanes in sediment extracting on the floor is primarily influenced by the orifice and secondly by the arrangements and radial sections of the vanes' placements.