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Originally Posted by Cathar
Hmmm, surely spreading resistance can't be 0. If it were zero, then the source of the heat flux would have to be the same size as the (flat) convectional area.
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For a 50mm diam x 5mm thick disk (with Edge Coeff of 10kw/m^2*c and zero End Coeff) on a 10mm diam source.
Waterloo predicts a Spreading Resistance of ~ 0.00000167 C/W
Dunno whether this is reasonable - as said above "Have difficulty "getting my head round" all the edge cooling
answers"
Maybe ask the Waterloo crowd.