Quote:
Originally posted by Gulp35
So advantage of the dimple is surface area/ radius(raising the cooling affect) but it also lowers the cooling the cooling affect by in creasing the resistance of copper by having the area where the boundry layer is thinnest (a circle around where the jet is impingeing) ontop of more copper.
What i am wondering now is if you made a cone and a cylinder with the same surface area and the same minimal bp width, which one would perform better, I'm thinking the cylinder.
Also I was talking to Volenti, and he says that I should, if i choose to go the path of the cone, make a small lip around the edge of the cone that would cause more turbulence and bp strenght.
What do you think about his idea?
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I agree, the cylinder should work best, for inpingement. something to remember is that we've got an inpingement effect as the flow hits the bottom of the cup/dimple, then all that's left is a fast flow, over (perpendicular to) the remaining surface, which in this case is the outer wall of the dimple/cup. That's a key to making this design perform.
The cylinder is harder to do, because it requires using a square cut, center cutting endmill, since the common drill bit will leave a cone.
I like the lip idea: it's a very small scale variation of Nicozeg's first waterblock (if I understand your idea correctly). It might add a bit of performance. The problem is implementing it:shrug: It would be far easier to round off the top edge of the dimple/cup, which might help the flow a little bit.