I see where you're headed, and it's a lot like a previous design I discussed (deeply hidden in one of morphling's threads).
What I dreamed up though, was a center inlet, with fins that are threaded to accept a barb, then another large barb (about 2") which would cause the coolant to return in the 2" tube. Lots of fins all around, in a radial pattern.
The 1/2 in. tube would be inside the 2" tube, and they'd be connected to some kind of res to seperate the flow.
The problem, of course, is mounting a 2" barb...
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