Quote:
Originally posted by bigben2k
Flow by convection is pretty slow: it's strictly based on the different densities of the water at different temps. With a pump, the flow is 100 times faster, and the result is that the temp diff is a couple of degrees, worst case.
You'll have to post a pic of the CNC'd shroud! 
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With a 1/2 degree difference between the top and bottom of the core I'd say its many thousands of times slower then the pump. Maybe tens of thousands.
Water barely expands at all when heated and thus is almost uneffected by convection at the temperature differences and distances were're concerned with.