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Originally Posted by Long Haired Git
......Assuming you want to keep the sam max distance of fin tip to coolant, ........
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A rather bold assumption.
Would suggest that 6x would be more appropriate for purely passive cooling where h~ 10-20 w/m^2*c
Would expect about the same finning efficiency as forced convection with h~ 100-200 w/m^2*c
Some aspects of the theory for passive radiators were discussed, from post 5 onwards,
here