Dammit! fixed the units on the graph.
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Originally Posted by Les
I take it that this h(eff)=24k is equivalent to my h(bp/Fin Interface); mentioned here .As such I have no quibble with the value. |
Yep, same sort of thing. It abstracts the top .5 mm of the baseplate plus the pins/fins. It still needs some work, but accounts for the net convection with less overhead.
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In my opinion,Billa and Incoherent have the only data from which an estimate of a TIM interface's Conductance (w/m^2*K) can be calculated.
Yes, pH's and Carhar's results can be modelled using values calculated from Billa's and Incoherent's data, but they are not the source of the values.
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Something to fight over when I've had some sleep.
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Originally Posted by Cathar
Is it just me, or does the scale of the graph in relation to the colors/heat-flux appear to be inverted? It appears to be telling me that the very hottest sections of the IHS are at the very corners?
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I guess I could have included some explanatory text with the picture....I'll insert some in a bit. Done!
What it's saying is that a significant portion of the heat leaves the die at the corners/edges, where the IHS is a bit cooler. I hadn't thought the silicon of the die would show much lateral heat flow, but there it is, a concept in need of pondering and experiments.