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tinatinatina

How do you find the heat radiation between two surfaces that aren’t perfectly parallel or perpendicular to each other?

I know that the view factors play a part, however, I can only dig up view factors for parallel and perpendicular surfaces:

http://machineryequipmentonline.com...oads/2016/03/RADIATION-HEAT-TRANSFER-0028.jpg

Is there a formula for finding the view factor and thus the radiation between surfaces between 0-180 degrees?

Many thanks,

Tina