Question

A tank 1.2 m2 and 3.6m high receives water at a rate of 20 dm3/s. The water flows from the tank through a 65mm diameter orifice having Cd = 0.79. Find the height of water above the orifice to maintain the flow.

Answer 1

Answer:

Flow rate is the volume of fluid per unit time flowing past a point through the area A. Here the shaded cylinder of fluid flows past point P in a uniform pipe in time t. The volume of the cylinder is Ad and the average velocity is ¯¯¯v=d/t v ¯ = d / t so that the flow rate is Q=Ad/t=A¯¯¯v Q = Ad / t = A v ¯ .