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Air at 20C flows through a 14-cm-diameter tube under fully developed conditions. The centerline velocity is uo = 5 m/s. Estimate (a) the friction

Air at 20C flows through a 14-cm-diameter tube under fully developed conditions. The centerline velocity is uo = 5 m/s. Estimate (a) the friction velocity u*, (b) the wall shear stress Tw, and (c) the average velocity (V = Q/A).

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