I am going to change the topic here somewhat. If flow rate is reduced below a certain point, would water not freeze at the pins of the chiller? That seems pretty obviously a bad thing. But what if we are near that point and with laminar flow overall? Does that imply that there is a substantial amount of water that is staying in the chiller for longer times due to the velocity profile?
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That water near the pins would get colder and would then serve as another buffer between the cold chiller and the warmed inlet water? And I suppose if residence time near the pins of the chiller was long enough then you could effectively decrease the volume of water that is actually circulating.
Could be irrelevant or even incorrect but it is a thought I just had.
I am still having an issue with how the change in peltier efficiency would offset dropping from turbulent to laminar flow regimes inside the CPU block anyway...