Semi-modular Rectangular Broad-crested Flow Meter with Lateral Contraction

A particular study of a semi-modular rectangular flow meter, characterized by both a broad- crested sill and lateral contraction, is presented. This is firstly theoretically examined and secondly experimentally tested under various geometrical dimensions. The theoretical development aims, on one hand, to identify the main characteristics of the flow and the geometrical parameters of the flow meter which influence the discharge. On the other hand, discharge coefficient is expressed with the help of the momentum equation applied between two sections judiciously chosen. Under various geometrical dimensions, the considered flow meter is intensively tested in order to corroborate or to correct the proposed theoretical relationships.