Question

71 mm thick horizontal plate made of an opaque material of thermal conductivity k= 25 W/m-K. At the bottom, water flows at a temperature of T∞,w = 25C, whereas air flows at the top of the plate at T∞,a = 710 C having convection coefficient of ha= 71 W/m2-K. Assuming a diffused top of the plate that receives an irradiated flux of 7100W/m2, of which 30% is reflected back. The top and bottom surface temperatures are maintained at 43 C and 35 C, respectively. By analyzing the radiation heat transfer coupled with conduction and convection, determine the transmissivity, reflectivity, absorptivity, and emissivity of the plate? Also determine the radiosity of the top of the plate and the water side convection heat transfer coefficient? ?=5.67×10−8 ?/?2?4

Answer 1

The numerical is solved in the below images