I like the design, one suggestion though:
This design has little surface area (not necessarily a bad thing), but since surface area is minimal, you will want to compensate not only with increased flow rate, but increased fluid velocity (the true factor impacting heat convection coefficient).
I would make the interior flow dimensions no bigger than the inner diameter of your barbs. The effect on surface area available at the core would be minimal, but the fluid velocity will increase with the square of the reduction in diameter.
As it is now, fluid will actually slow down for the trip through the block, then speed up on exit. Make the faster fluid work for you.
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