We actually examined a similar design quite some time ago. I also explored a similar idea, but dropped it.
The first issue is that regardless of the outlet geometry, you're not forcing a circular movement: the center inlet will flow straight towards the 4 outlets. Try it.
The other issue is that even if you were to be able to force a circular motion, which is actually hard to do, you'd find that the heavier cooler particles would be flung outside, keeping the warmer water to flow over the core.
I think JayDee116 and I debated such a design, but it must have been over a year ago now.
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