Quote:
Originally posted by Albigger
Holy Sh**!! If you really are pushing 250 gph through a 3/16" diameter hole, your water velocity is about 15 m/s coming out of that nozzle (by my calculations - read: could contain errors)
doing a rough calculation of my block, i would have roughly 3 m/s coming through my inlet 
so how much of an improvement does higher water velocity yeild in terms of ability to remove heat??
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That would be correct.
The pressure drop through a 3/16 opening, at 4 gpm (240 gph) is 11.7 feet (!) per inch of length. Flow speed is 46.5 fps (14.2 m/s).
There will be a nozzle in the middle, which nicely tapers down from 3/4 inch to 3/16, over a length of about 1/2 inch, so the total restriction of that little area should be minimal.
The cooling effect is enhanced, simply because it throws the coolant into highly turbulent flow, which is absolutely amazing for cooling. It can be calculated using the Reynolds equation.