You're on the right track jaydee. In jet impingement on a flat surface, what's occurring at the absolute dead center of where the jet strikes the base?
BTW - I no longer really consider the Cascade to be a true impingement design. It's really more of a super-turbulent mash design, along the lines of its origin, being that of a faucet at full blast inside the mouth of a tall deep cup.
The problems I faced with jet impingement (JI) after a lot of experimentation was that the Cascade-style mashing worked out best, mostly due to the sheer density of jets/cups that is achievable with the Cascade approach. Making the cups wider and giving enough room to allow for true impingement made things worse, and peak overclock and temperatures dropped away as the convectional gradient is less consistent across the base of the cups.
What you're seeing in the picture is an attempt to solve the inherent drawbacks to jet impingement across a large flat surface.
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