An experimental study of the discharge coefficient of pipe perforations

Abstract

Experiments were conducted to study the variation /-/2 of the pressure loss coefficient of pipe perforations with geometrical parameters of the perforations and a Reynolds number based on the hydraulic diameter of an orifice /-/3 representing the perforations. The experimental data are used to develop an empirical relationship between the head loss across the perforations and the geometrical and hydraulic H4 parameters related to the perforations which was seen to give better predictions when the perforations are not very closely spaced. The experimental results reported herein correspond to the pipes of small perforated length, with downstream end of the pipe closed.