An orifice plate is to be used to measure the rate of air flow through a 1.2
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An orifice plate is to be used to measure the rate of air flow through a 1.2 m diameter duct. The air velocity in the duct is limited to 12 m/s and a water tube manometer, having a maximum difference between water levels of 130 mm, is to be used. Assuming the coefficient of discharge, CD to be 0.63, determine a suitable orifice diameter to make full use of the manometer range. Take the density of air as 1.2 kg/m3.
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