1. Show that for laminar flow of air (Pr = 0.714), the local and average values of Nusselt number for natural convection heat transfer from or to a vertical plate are given by 2. What is the...

1. Show that for laminar flow of air (Pr = 0.714), the local and average values of Nusselt number for natural convection heat transfer from or to a vertical plate are given by

2. What is the recommended correlation for natural convection over a vertical plate or cylinder in the turbulent flow region?