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Originally Posted by Les
Cathar's Reynolds appear correct - quick check with SF Pressure drop5.2(the old free one)
Do seem to obey(ish) Re=21.2*lpm/d where d is in metres
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It owuld as i derived it from first principals.
kinematic viscosity = 1*10-6 and work from there, subsituting V=Q/a wher a is 0.25*pi*v^2. LPm = 5/3 * 10^-5 m^3/s as well as while m is annoying m^3/s is a bit hard to comprehend in water cooling scales. Its close enough and saves me some maths here and there. Shouldnt of given it a name when its merely a unit conversion but i would like to have my own eq
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And you should be able to calculate pressure by hand its only colebrook or 64/re for the friction factor. I would be tempted in water cooling to use coffin mason as most flows exist in the transition region (for pipes at least, tried to make a calculator and went doah when most values were nearer transition). Theres always playing with the reynolds number (using maximum instead of mean average velocity).