A heat flux gage of 4-mm diameter is positioned normal to and 1 m from the 5 mm-diameter aperture of a blackbody furnace at 1000 K. The diffuse, gray cover shield (E = 0.2) of the furnace has an outer diameter of 100 mm and its temperature is 350 K. The furnace and gage are located in a large room whose walls have an emissivity of 0.8 and are at 300 K.

(a) What is the irradiation on the gage, Gg (W/m²), considering only emission from the aperture of the furnace?

(b) What is the irradiation on the gage due to radiation from the cover and aperture?

Transcribed Image Text:

- Furnace. T, = 1000K Cover. T, = 350 K, e = 0.2 Gage. 4-mm D= 100 mm diameter Aperture, 5-mm diameter 1m-