In the absence of additional information, the graph doesn't mean a whole heckuva lot. I know that BillA has done a lot of work in the area, but I do not know the specifics of how he has performed his tests.
All I'm telling you is that convection from a liquid to a solid will improve with increased velocity. Whether this results in an overall improvement depends on the change in energy input to the system versus the change in convection efficiency.
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