Two plane coaxial disks are separated by a distance (L=0.80 mathrm{~m}). The lower disk (left(A_{1} ight)) is

Two plane coaxial disks are separated by a distance \(L=0.80 \mathrm{~m}\). The lower disk \(\left(A_{1}\right)\) is solid with a diameter \(D_{o}=0.80 \mathrm{~m}\) and a temperature \(T_{1}=300 \mathrm{~K}\). The upper disk \(\left(A_{2}\right)\), at temperature \(T_{2}=900 \mathrm{~K}\), has the same outer diameter but is ring-shaped with an inner diameter \(D_{i}=0.40 \mathrm{~m}\).

Assuming the disks to be blackbodies, calculate the net rate of radiative heat exchange between them.

Transcribed Image Text:

A2, T- A, T L Do