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Ermm... possibly not as welcome as all that.
I'm pretty much only theoretical in that I've never even seen a watercooled PC in real life. I'm just hanging around here trying to figure out how to build my next PC (watercooled, heavily silenced) after I graduate and get a job.
I'm at university finishing off my MEng in Aeronautical engineering (basically Jet Engines) so simple thermodynamics like that is a doddle. However, being as I have no experience whatever with waterblocks then I really don't have a lot to contribute. Besides, my exams start in two weeks so I should really be working.

Edit: just a thought, but for heat flows it may well be easier to measure the air flows/temperatures rather than the water flows. The temperature differences and volumes will be higher in both cases...