Quote:
Originally posted by unregistered
if the TIM joint = a temp OFFSET of x°
then 2 TIM joints cannot be less than 2*x°, plus the conductance resistance of the shim's thickness
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I suggest it can .
Perhaps the considering as a "Finite Compound Spreading Resistance"* problem and comparing to the "Finite Isotropic" case** may give some insight.Maybe the "isoflux" is questionable but ....
An example of the "Compound" case for a 40x40mm heatsink with a 1mm Cu heatspreader :
comparing to the "Isotropic" case get:
However this only suggests that the heatspreader may have minimal detrimental effects with cooling which is poor in the first place.
*
http://www.mhtl.uwaterloo.ca/old/onl...ce/strip1.html
**
http://www.mhtl.uwaterloo.ca/old/onl...ce/strip2.html