Control Effect of Flow through Perforated Inlet Diffuser in the Rectangular Settling Tanks : II. Experimental Investigations

Abstract

The experiments were carried out using a model inlet of the settling tank in order to confirm the theories derived in the previous paper and also to check the accuracy of the approximate method of calculation. Experiments were conducted for two types of inlet chamber, those in which the inlet conduits are parallel and perpendicular to the diffuser walls, respectively. The rate of distribution of flow along the diffuser walls was observed, and the results of the experiments are discussed in detail. The relative values of calculated flow distribution were compared to the observed values and found to be in good agreement, so that the control effect of flow through the inlet diffuser wall of a rectangular settling tank has been clarified, and the design criteria suggested by the theory have proved quite useful in the actual design of basins. Furthermore, some discussions on the law of similitude for this model test are presented.