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Originally Posted by wijdeveld
By the way, the curving of the model is right since it is a finite element model, meaning that the dC/dX slope is dependant on different conditions for each element.
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Heatflow is directly proportional to the temperature gradient dT/dz. Your model gives a higher gradient as you move away from the die, implying greater heatflow in areas away from the die. Where is that heat coming from? You have either disequilibria or are generating heat inside the heatspreader and waterblock.
The curves may be right for the model, but neither the curves nor the model are right for reality.
Another question, did you ascribe the same properities to both TIM joints, or are they modeled on two different compounds?