Consider compressible viscous flow over the same flat plate as in Prob. 4.43. Assume a completely turbulent boundary layer on the plate. The free-stream properties are those at standard sea level. Calculate the friction drag on the flat plate when (a) M∞ = 1 and (b) M∞= 3. (c) Assuming that the friction drag, Df, varies with velocity asV∞n, calculate the value of the exponent n based on the answers from (a) and (b). Note: This problem examines the combined effect of compressibility and friction on the “velocity squared” law, in the same spirit of Probs. 4.43 and 4.44, which isolated the effect of friction in an incompressible flow.
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