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Originally Posted by bobo5195
Y splitter is something like 0.3*mean velocity^2 of highest speed side (NOT Q)
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I got: Head in meters H20 = 0.0088 * Flow in LPM * Flow in LPM.
I did the pressure drop for each barb as a tube of the right ID, the pressure drop for the lip of the entry to the tube, and then the PD over the split, and then the PD for the two exit tubes at half the flow of the original.
Eg: 1/2" Y with 8.46mm ID at 4 LPM entry:
Entry lip: 7.9 PSI
Entry barb: 0.8 PSI
Y section: 4.9 PSI
Two exit barbs at half flow: 0.25 PSI each = 0.5
Hmmm, I add the two exits together, which is a mistake. Nuts. Anyway, adding and converting to mH20 I get 0.143m. I am out by 0.5PSI, but that will be like 3% which is within my margin of error.
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I suppose the answer to this question also depends on the fans used. If you have very low airflow, the difference between parallel and serial for radiator C/W will be vanishingly small, however the overall decrease in flow resistance may be worthwhile.
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1. My simulator's pretty good. Dropping to 5v fans, parallel is still worse, by about 0.9 degrees C. At 12v this drops to a mere 0.06 degree difference.
2. Current model shows the Y joints result in a larger resistance than the benefit of parallel radiators, so no overall flow rate improvement.