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Originally Posted by davidzo
make the pins shorter so that the water and turbulences can get to the baseplate where the thermal resistance is the lowest and turbulences to lower the boundary layer would be most effective. If the heat has to cross a long tiny pin before it reaches the cold water, the thermal resistance is up...
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Shouldn't turbulance at/near the baseplate be essentially the same regardless of pin height? (within reason, of course). I'm attempting to also take into account the cross-sectional area of the main plenum; 3.7mm tall pins seem about right. As for boundary layer formation, I don't expect much at any point in the pin grid. I'd also like to note that there are many more jets than you'd think, so there are no gaping gaps where some pins will get 'hit' with much less turbulant coolant.
Trying to alleviate restriction mostly by tweaking the jets. Since ~60% of the pressure drop in a G5/G7 is due to the jets, I'm mostly focusing on tweaking this particular area.
We'll see what happens with the pins. My machinist may advise that they be shortened, but until that time, I'm going to go ahead with 3.7mm.