Chapter 13, Problem 13.96P

Consider Problem 6.17. The stationary plate, ambient air, and surroundings are at $T_{\infty }=T_{\text{sur}}=20°\text{C}$ the rotating disk temperature is $T_s=80°\text{C}$ , what is the total power dissipated from the disk’s top surface for $g=2\text{mm}$ , $\Omega =150\text{rad/s}$ 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 $\epsilon =0.10$ . Determine the total power dissipated from the disk’s worn top surface.