GATE 2026 CH – Question 32
Water is discharged from vertical side of a tank through a circular orifice of diameter 2 cm under laminar flow conditions. The water surface in the tank is maintained at constant level above the center of the orifice. If the fluid jet has a diameter of 1.6 cm at its vena contracta, then the coefficient of contraction is ________________ (rounded off to two decimal places).
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Correct answer: 0.63 to 0.65
Explanation
The coefficient of contraction is the ratio of the jet area at the vena contracta to the orifice area: $C_c = \left(\frac{1.6}{2}\right)^2 = 0.64$.