A tool for processing silicon wafers is housed within a vacuum chamber whose walls are black and maintained by a coolant at Tvc = 300 K. The thin silicon wafer is mounted close to, but not touching, a chuck, which is electrically heated and maintained at the temperature Tc.
The rotating disk temperature is Ts = 80°C, what is the total power dissipated from the disk's top sur- face for g = 2 mm, D= 150 rad/s for the case when both the stationary plate and disk are painted with Parsons black paint?
Over time, the paint on the rotating disk is worn off by dust in the air, exposing the base metal, which has an emissivity of s = 0.10. Determine the total power dissipated from the disk's worn top surface.