The arrangement shown is to be used to calibrate a heat flux gage. The gage has a black surface that is 10 mm in diameter and is maintained at 17?C by means of a water cooled backing plate. The heater, 200 mm in diameter, has a black surface that is maintained at 800 K and is located 0.5 m from the gage. The surroundings and the air are at 27?C and the convection heat transfer coefficient between the gage and the air is 15 W/m² ? K.

(a) Determine the net radiation exchange between the heater and the gage.

(b) Determine the net transfer of radiation to the gage per unit area of the gage

(c) What is the net heat transfer rate to the gage per unit area of the gage?

(d) If the gage is constructed according to the description of Problem 3.98. What heat flux will it indicate?

Transcribed Image Text:

Heated plate. T, 0.5 m Gage surface Cooling water Heat flux gage, T,