Ah-ha finally after 7 years of following I can contribute to this thread!
A little bit about liquid cooling as discussed above. The mineral oil used for "Fish tank" PCs is because the oil does not conduct so the boards/circuits go right in the fluid. That is not a concern here as the fluid loop is isolated mechanically. The fluid only contacts the chill plate.
The reservoir is important to maintain fluid level through out thermal expansion/contraction. Having air in the system can lead to bubbles at the pump and cavitation. Put the reservoir high in the system so you can bleed all the air out of the lines. I would bet this is a bigger problem for internal combustion engines with their larger temperature swings. Having a small reservoir is cheap insurance.
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