What Is Coefficient Of Contraction?

What Is Coefficient Of Contraction?
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Answer :

Coefficient of contraction is the ratio of area of jet at vena contracta to the area of orifice.
The typical value may be taken as 0.64 for a sharp orifice (concentric with the flow channel).
The smaller the value, the more effect the vena contracta has.
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Related questions

Why is the intermolecular attraction ball predominant if the contraction coefficient is Z <1 ?

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Coefficient of contraction is the ratio of (A) Actual velocity of jet at vena contracta to the theoretical velocity (B) Loss of head in the orifice to the head of water available at the exit of the orifice (C) Loss of head in the orifice to the head of water available at the exit of the orifice (D) Area of jet at vena-contracta to the area of orifice

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A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is (A) 0.46 (B) 0.64 (C) 0.78 (D) 0.87

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