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7.11 Consider two cases involving parallel flow of dry air at V = 1 m/s, T∞...

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Mechanical Engineering

7.11 Consider two cases involving parallel flowof dry air at V = 1 m/s, T∞ = 45°C,and atmospheric pressure over an isothermal plate atTs = 20°C. In the first case,Rex,c = 5 × 105, while inthe second case the flow is tripped to a turbulent state atx = 0 m. At what x‐location are the thermalboundary layer thicknesses of the two cases equal? What are thelocal heat fluxes at this location for the two cases?

Answer: x=.142; q”lam = -129W/m2;  q”turb = -175W/m2

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