All correlations for external flow Nusselt number representing average heat transfer coefficient for spheres have a constant 2 on their right-hand sides. Why? Prove your argument. a. Calculate the...

All correlations for external flow Nusselt number representing average heat transfer coefficient for spheres have a constant 2 on their right-hand sides. Why? Prove your argument.

a. Calculate the distributions of heat transfer coefficient along the surface.

b. Assume that air is flowing upward 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.