Consider a 3-m-high rectangular enclosure consisting of two surfaces separated by a 0.1-m air gap at 1 atm. If the surface temperatures across the air gap are 30°C and €“10°C, determine the ratio of the heat transfer rate for the horizontal orientation (with hotter surface at the bottom) to that for vertical orientation.

Transcribed Image Text:

30°C -10°C Alr -10°C 3 m +0.1 m- 0.1 m Alr 30°C 3 m