Here's my impression on the issue...
We all know that higher flow in the waterblocks gives better performance. That will be true regardless of whether the coolant is 0C or 100C. Whats different here is the heat exchanger. Logic says we want the water to stay in the heat exchanger as long as possible to get the water cooled down as much as possible, and therefore want low flow rates. However, billA's testing shows that this isn't entirely true in heatercores as you will actually see an improvement in performance up to about 4 GPM thanks to the added turbulence at these flow rates exposing more water to the copper of the heatercore. But now we're not working with a heatercore, but instead a waterblock with peltiers on either side. This is a different environment with different characteristics, most notably the drastically reduced surface area, which has a new sweet spot; instead of the 4 GPM of the heatercore we have a much lower flow rate that billA is using here for a balance of the high flow the waterblock wants and the low flow the heat exchanger wants.
Hopefully there is some accuracy in all that. Some people (my physics teacher, the AP tests) tell me I know physics, but I know their full of shit and I actually have no idea whats going on.
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