PROBLEM 4 Problem 11.5. A 0.5 m wide and 2.5 m high flat, vertical surface is subject to a UWT boundary condition with T = 70°C. The surface is exposed to air at an ambient temperature of 20 °C. a) Calculate the distributions of heat transfer coefficient along the surface. (Calculate at a few points.) b) Assume that air is flowing upwards, and parallel to the surface with a velocity of 0.05 m/s. Calculate the average heat transfer coefficient for the surface. Does laminar-turbulent transition take place? If so, specify the approximate location of the transition.

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