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Topic: Shape factor (Heat transfer-radiation)  (Read 2503 times)

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Offline DanielGeltman

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Shape factor (Heat transfer-radiation)
« on: March 09, 2017, 04:41:01 AM »
Hey everyone,

I have a problem figuring out the shape factor in the following problem:



"Surfaces 1, 2 and 3 are very long (I assumed infinite..)- surfaces 1 and 2 are identical plates and surface 3 is a quarter of a cylinder. There is vacuum between the surfaces.
What is the value of the shape factor F33? (That's not the real question but that's where I had a mistake)"

So.. I decided to use the following figures:



If we assume that there is an inner cylinder of infinitesimal radius we'll find out that the shape factor F33 is 1, but since we have only quarter of a cylinder I assumed that the shape factor F33 would be 0.25.

I was wrong but don't know why. I also don't know the real shape factor-just that it's not 0.25.

Could you please help me?





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