I had actualy orginaly thought up something similar to your radius block, but the problem that I couldnt seem to find a satisfactory awnser to was that the water wouldnt flow to the outlet evenly, and in the area outside the fins Iexpect you will basicly going to get stangnet pools of warm water, and poor water flow.
Also I dont expect the turbulance to form a plane at all, where the 2 streams collide I expect the water to swirl around rapidly, striking the pins and the baseplate, If you have ever seen a rapid in a river you get some idea how I think the water will "tumble around it's self" in the center of the block. The pins are there to add to the turbulance, and to increase the area of active thermal transfer, You will notice that I went with pins, because they are easy to make by cross cuting.
As far as your Radius design goes, I would look at using a cross cuting style, so that you end up with a hollow where you have your baseplate strike, and then mabey 20~30 wedge shaped fins, that fit together like the pieces of a pie.
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