Confirms (for this forum) what has been found in other tests; nanofluids
transfer heat better than distilled water. The less turbulent the flow,
the greater the difference between nanofluids and water. That is why
the temp difference was more pronounced with low flow. A low restriction,
low to medium flow loop would see a nice improvement with a nanofluid.
A high restriction, high flow loop would not see too much improvement.
Why? Thermal conductivity of the cooling fluid matters more in heat transfer
when the flow is less turbulent and nanofluids conduct heat better. When
the flow is more turbulent, heat transfer due to convection is more important.

I'll give this link once again: http://www.electronics-cooling.com/html/2007_aug_a3.php