Question

Oil flows through a standard 25 mm diameter orifice under 5.5 m head at a

measured rate of 3 L/s. The jet strikes a wall 1.5 m away and 0.12 m

vertically below the centreline of the contracted section of the jet. Determine

all the coefficients of the orifice.

Answer 1

$C_v=\sqrt{\frac{x^2}{4yH}}=0.92,$

$C_d=\frac Q{A\sqrt{2gH}}=0.59,$

$C_c=\frac{C_d}{C_v}=0.64.$