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Q9. A tank containing oil of density 850 kg/m³ has two sharp edged outlet orifices on one side of the tank. The upper orifice is 15 mm diameter and has its centre 1.3 m below the oil surface. The lower orifice is 20 mm diameter and has its centre 2.8 m below the oil surface. Oil is supplied to the tank at 1.8 kg/s to maintain a constant tank level.

Calculate EACH of the following:

(a) The mass flow rate of oil from the 15 mm diameter orifice; (8)

(b) The coefficient of velocity for the 20 mm diameter orifice. (8)

Note: For 15 mm diameter orifice, Coefficient of velocity = 0.97.

Coefficient of contraction = 0.68

For 20 mm diameter orifice, Coefficient of contraction = 0.72.