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## Main Question or Discussion Point

Hi all,

I have a heat sink for which I know the exact geometry (have the CAD model). This heat sink was custom designed and machined from a hunk of aluminum, though it is very basic and I have a hunch I can find an extrusion or OTS part that will match its performance. Rather than trying to just match the surface area, I'd like to know what the thermal resistance of it is so that I can try to match it.

How do I calculate the thermal resistance of the heat sink given its geometry and material?

Here's a rough description of the heat sink:

18 square fins spaced evenly in a single row at a pitch of 0.36". Each fin is 2" tall by 2" wide and is 0.08" thick.

Thanks

I have a heat sink for which I know the exact geometry (have the CAD model). This heat sink was custom designed and machined from a hunk of aluminum, though it is very basic and I have a hunch I can find an extrusion or OTS part that will match its performance. Rather than trying to just match the surface area, I'd like to know what the thermal resistance of it is so that I can try to match it.

How do I calculate the thermal resistance of the heat sink given its geometry and material?

Here's a rough description of the heat sink:

18 square fins spaced evenly in a single row at a pitch of 0.36". Each fin is 2" tall by 2" wide and is 0.08" thick.

Thanks

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