Standard air flows with a velocity of 18 m/s in a 6-mm-diameter copper tube. (a) Confirm that the flow is turbulent and calculate the head loss per unit length of tube. (b) If great care is taken to...

Standard air flows with a velocity of 18 m/s in a 6-mm-diameter copper tube. (a) Confirm that the flow is turbulent and calculate the head loss per unit length of tube. (b) If great care is taken to maintain laminar-flow conditions in the tube, determine the head loss per unit length under the laminar-flow condition and the percentage change in head loss per unit length that occurs when the flow changes from the laminar to the turbulent flow condition.