Quote:
Originally posted by hara
5. Why would you want to add more mass to the cooler areas to build up heat? The heat will have already been absorbed by the water.
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If it was already absorbed by the water then you wouldn't need any material there at all, let alone set different depths? :shrug: The more mass you have the slower the heat from the center of that mass will make it to the outer edges where the coolant is. The convection is the same but it is the same principle as driving. it takes you longer to drive 1 mile than it does 1.5 miles. The same applies to heat. Making a longer path for it to travel is not what you want at any temperature. But then again you don't want it to short either or there will not be enough mass to absorb the amount of heat being put off.
Reread what you said in #2 there. Worry less about what is going on farther away from the core and worry what is going on at the core. I think you are trying to make it far more complicated than it needs to be in order to do the same thing with varing depths around the core.
And as for varying the channel higths that sit ontop of the core, I have no clue how you can calculate the warmer spots of the core. The core itself is not evenly hot. The left side can be warmer than the right, or the middle warmer than the edges and hotspots here and there. It depends on what is going on inside the core. So trying to figure out what part of the core is the hottest and adjusting the design around that is nearly impossible. It would be better to just assume that the heat is spread 100% evenly across the core and make you diesign around that as it will not be possible to measure the temps on top of the core as it will fry with no HS.
So in other words what you said in #3 there is useless. Your proprotional argument fails as you do not know where the heat really is coming off the core. It is not going to spread evenly to your proprtional concept unless you are 100% certain where the heat levels are. If one fin is higher where the core is cooler it will not work well, nor will having the fin to short where it is warmer. Make them all the same higth. You also have to cosider the TIM joint will not be perfect enough to make use of your porprtional design (even if it was right).
If you knew where the most heat was, and you where capable of a perfect TIM joint (which there is no such thing) then making various levels to correspond with the heat maybe an idea. But this info is not known so IMO your wasting you time trying to do that. Make the fins the same higth, do not worry about the heat around the outside of the core as the water will do plenty good with just a flat bottom of the block to absorb it. No special stuff would be needed as there isn't enough heat left over to really worry about.
Thats all I have, I maybe off base. Best thing to do would make a few and trial and error it a bit. Try your different fin hights and try it with the same size fins ect... There is to many unknown variables to make it perfect by calculation IMO.