Solving natural convection problems in Çengel’s 5th Edition requires careful attention to property evaluation (film temperature) and the selection of the correct Nusselt correlation based on geometry and the calculated Rayleigh number. The problems above represent standard archetypes found in the end-of-chapter exercises.
Using the correlation for a vertical plate on a horizontal plate (which has a different characteristic length (L_c) and different constants).
: Analyzing natural convection in spaces like double-pane windows. Features of the Solution Manual