Consider radiation exchange between two annular cylinders of radii \(R_{\mathrm{i}}\), and \(R_{\mathrm{o}}\) facing each other. This is similar to the radiation between flat plates considered in the text except for the fact that the geometry is different.

What are the view factors? How would you calculate them? Use them to set up the equation for radiosity and develop an expression for the radiation interchange between these surfaces.