A dryer is shaped like a long semi-cylindrical duct of diameter 2 m. The base of the dryer...

A dryer is shaped like a long semi-cylindrical duct of diameter 2 m. The base of the dryer is occupied with water-soaked materials that are to be dried. The dome of the dryer has a constant temperature of 500°C, while the materials at the base are at 40°C. Both surfaces can be approximated as black-body. Determine the length of the dryer so that the materials are dried at a rate of 0.1 kg/s.

FIGURE P13–45