the approximate size of the equivalent roughness

| August 30, 2017

Question
A 3-ft-diameter duct is used to carry ventilating air into a vehicular tunnel at a rate of 12000 ft3/min. Tests show that the pressure drop is 1.5 in. of water per 1500 ft of duct. What is(a)the value of the friction factor for this duct and(b)the approximate size of the equivalent roughness of the surface of the duct?

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