7.11 Consider two cases involving parallel flow of dry air at V = 1 m/s, T∞ = 45°C, and atmospheric pressure over an isothermal plate at Ts = 20°C. In the first case, Rex,c = 5 × 105, while in the second case the flow is tripped to a turbulent state at x = 0 m. At what x‐location are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes at this location for the two cases?
Answer: x=.142; q”lam = -129 W/m2; q”turb = -175 W/m2
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