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Originally Posted by unregistered
the question is: are any (reasonably expected) European flow rates expected below 0.5gpm ?
one needs be mindful of the actual pump capability in these smaller ID systems, the friction losses are low specifically because the fluid velocity is also low
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Agreed. The WCP testbed is a fairly bad indication as it uses a very high restriction radiator which challenges even the most restrictive waterblocks for flow-choking ability.
0.5GPM is perhaps a realistic minimum for any system that uses a heater-core style radiator. I could not imagine a system pushing less than 0.25GPM though, even with the continuous small-ID looped tubing radiators though.
For a lark I bought this baby 2.5W 200LPH pump that's about 40x40x30mm in size with 1/4" OD outlets on it (about 4.5mm ID) with a 65cm head height. Even that tiny thing could push around 1.5LPM (~0.4GPM) through two heater-cores in series, 2m of tubing and a Cascade SS.