The design is extremely similar to a concept that I prototyped on my toy thermal simulator.
Yes, there's impingement in the true sense of the word, the issue being that the impingement isn't exactly where you want it. "Jet impingement" means narrowing the inlet orifice to boost water velocity.
A simplistic appraisal:
The heat is coming from the bottom. Your impingement action is coming from the side. Much of that impingement action in your design therefore occurs high up the copper walls. Now since the total waterflow is being distributed over the walls, the thermal gradient through the walls pretty much means that not all of the water is being used to cool the hottest bits of the block being the base of the block and the bottom of the channel walls.
The design will perform okay. I'd predict slightly better than Swiftech MCW5000 performance.
Please note that this is just a casual obervation backed with some simulation results.
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