A circular disk of surface area A 3 = 0.02 m 2 is placed on the base surface of the oven of Problem 20, as shown in the right figure. All other surfaces have a combined surface area of A 2 = 0.5 m 2 ....

A circular disk of surface area
A
₃
= 0.02 m²
is placed on the base surface of the oven of Problem 20, as shown in the right figure. All other surfaces have a combined surface area of
A
₂
= 0.5 m². Find
F
₁₂,
F
₃₂, and
F
₂₃.

Problem 20

An oven, as shown in the left figure, is in the shape of a cube of side
l. The surface of the base is
A
₁
= 0.1 m². All other surfaces have a combined surface area of
A
₂
= 0.5 m². Find the view factor
F
₂₁
and
F
₂₂.