Determine the view factors F12 and F21 for the following geometries (as shown in the figure): (a) a sphere of diameter, D, inside a cubic box of length L=D, (b) one side of a diagonal partition in a long square duct of side L, and (c) the end and side of a circular tube with a diameter equal to its length.
GIVEN
Geometrical configurations shown above
FIND
The view factors F12 and F21
SKETCH
F12=1, as body (A1) sphere of diameter D cannot see itself.
Now,
F12=1, as body (A1) diagonal of base L cannot see itself.
Now,
F12=1, as body (A1) circle of base L cannot see itself.
Now,
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