F6 heatsink Calculations
Revisiting the neverending discussion of heatsink calculations........
Refering to this webpage
ESP - Heatsink design and transistor mounting
How do I calculate the effect of multiple heatsinks bolted to a base?
If you orient this sink on its "edge" (closest surface in your image) with the fins running up and down and place multiple sinks side by side, you simply divide the c/w figure by the number of sinks you are using. For example, at 0.85k/w each, having 2 of them side by side will result in net dissipation of 0.42c/w. Having 4 of them will result in 0.21c/w dissipation.
However, is you take these sinks and stack them one on top of the other (effectively making a column of them), the impact of adding more is significantly decreased. One will dissipate 0.85c/w. Two (one of top of the other -effectively making it look like a single sink that is twice as tall) will increase your cooling by 0.85 / sqrt(2) or about 0.60c/w. Thus it is much less efficient to stack them than to place them side by side.
You might want to see the "heatsinking" section of my Aleph-X page for a more thorough description...
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