The tank in question 5.4 is covered with an airtight lid and the air space above the water is pressurised so that the flow increases to 0.00093m3 /s. If the other details remain the same, what is the pressure of the air?
Question 5.4
(a) Explain the hydraulic difference between a small orifice and a large orifice. (b) With respect to a small orifice, define what is meant by the coefficient of velocity and the coefficient of contraction. Give typical values of each coefficient. (c) A small orifice with a diameter of 0.012m discharges water under a head of 1.43m. If CD is 0.59, what is the actual discharge?
