Quote Originally Posted by millertime359 View Post
maybe because the fluid is moving too faster for the slower fans to keep up with cooling the radiators? Or I just completely missing it?
Quote Originally Posted by Martinm210 View Post
I don't know.

I know the net amount of time the water is in the radiator is the same regardless of flow rate when you consider the recirculation part of the loop. Double the flow rate, and it's only in there half the time, but twice as often, etc.

But the water itself and turbulence I figured would always be better with higher flow rates and increased velocity.

I can't make sense of it..?
I think millertime has part of it right, in our normal loops it might not be but these guys tested with a water chiller and not a closed recirculating loop. There is probably a non linear curve to how much heat the radiator dissipates depending on flow, and a non linear curve on how well the air absorbs heat depending on cfm. There is I'm guessing a turning point where curves go down when the flow is increased, and this means there is a perfect equilibrium point where there is a certain amount of flow that you can reach that will give you the best temps at that certain CFM.