Consider airflow over a flat plate of length L 1 m under

Chapter , Problem 6.18

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Consider airflow over a flat plate of length L 1 m under conditions for which transition occurs at xc 0.5 m based on the critical Reynolds number, Rex,c 5 105 . (a) Evaluating the thermophysical properties of air at 350 K, determine the air velocity. (b) In the laminar and turbulent regions, the local convection coefficients are, respectively, where, at T 350 K, Clam 8.845 W/m3/2 K, Cturb 49.75 W/m1.8 K, and x has units of m. Develop an expression for the average convection coefficient, lam(x), as a function of distance from the leading edge, x, for the laminar region, 0 x xc. (c) Develop an expression for the average convection coefficient, turb(x), as a function of distance from the leading edge, x, for the turbulent region, xc x L. (d) On the same coordinates, plot the local and average convection coefficients, hx and , respectively, as a function of x for 0 x L