If a fluid jet discharging from a 50mm diameter,orifice has a diameter of 40mm at its vna contracta,then its coefficient of contraction will be
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the coefficient of contraction always constant e.g., 0.64 . actually coefficient of contraction is the ratio of the area of the jet, at vena-contracta, to the area of the orifice. Mathematically coefficient of contraction, The value of Coefficient of contraction varies slightly with the available head of the liquid, size and shape of the orifice. The average value of is 0.64.
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