Experimental Study of Coupled Parabolic Weir over Flow and Gate under Flow Rate

Abstract

A combined flow through composite hydraulic structure or device represents a very important problem as a result of the interaction between over flow rate and under flow rate. In the present study, many experiments were implemented in the hydraulic laboratory considering several variables such as hydraulic variables and geometrical variables to investigate the overlapping between weir and gate having a parabolic shape. It is found that the weir and gate cross sectional area of flow have significant effect on coefficient of discharge of combined hydraulic structure. It is also very necessary to take the effect of geometrical parameter and the parameter expressed in this study in terms of ratio (y/H). This ratio has a primary effect on discharge coefficient. This study indicates that the overlapping between flow velocity of weir and gate respectively is central to value of discharge coefficient. This study mentions the effect of viscosity on coefficient of discharge in terms of Reynold number. Also, this study proves that the parabolic shape more efficiency as compare with regular shape.

Keyword: Parabolic weir, Parabolic gate, Composite hydraulic structure, Flume.