Uh, gotta keep in mind structural integrity here. Widening the cups too far won't leave much copper to hold the block together.
I already experimented at various flow rates, and the results basically showed a drop off in cooling performance beyond a certain cup width.
I understand what you're getting at, but I don't believe that it's an issue here, again because the width of any one stagnation zone is largely unimportant given the surrounding cups and their zones.
Basically we're swapping the efficiency of any one region for a mass of regions.
It's a fact, the further you get away from the center of the stagnation region, the lower the cooling effect. Better to have a mass of properly formed stagnation zones, and allow no wider than these properly formed zones, to avoid the performance drop off as you move away from the center.
Making the cups wider than I've established causes a performance loss across a broad range of commonly accessible flow rates, and would result in a block tuned for excessively high flow rates that not even I can achieve. What's the point?
The optimal width of the cups seems to vary in very small amounts between 4lpm and 12lpm, basically being near indistinguishable. There actually is a fairly happy tight range of cup widths (in proportion to the jet widths) that works for a large range of flow rates that people commonly use.
If we were pushing 50lpm, then yeah, maybe enough to require a different approach.
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