The curing process of Example 15.6 involves exposure of the plate to irradiation from an infrared lamp and attendant cooling by convection and radiation exchange with the surroundings. Alternatively, in lieu of the lamp, heating may be achieved by inserting the plate in an oven whose walls (the surroundings) are maintained at an elevated temperature. Consider conditions for which the oven walls are at 200°C, air flow over the plate is characterized by T∞ = 20°C and and the coating has an emissivity of ε = 0.5. What is the temperature of the coating?
Example 15.6:
The coating on a plate is cured by exposure to an infrared lamp providing an irradiation of 2000 W/m2 . It absorbs 80% of the irradiation from the lamp and has an emissivity of 0.50. It is also exposed to an air flow and large surroundings for which temperatures are 20°C and 30°C, respectively. The convection coefficient between the coating 15 W/m2 . K, and the ambient air is and the back side of the plate is insulated. What is the temperature of the coated plate?