That's interesting info, but we'd need more data to get to the point where we could use it to design a waterblock.
The flow rate is a big factor, as is the fin design.
Also, the way that you present this info, it seems that thicker is better. Maybe you could explain why, or more specifically "How thick is too thick".
I've come to the conclusion that there is a rate of heat conduction for different flow rates, and that given a channel size, there should be a way to figure out what the baseplate thickness should be, based on the amount and pattern of heat that it exposes to the coolant. Balancing these two I believe is the key (along with the optimal fin pattern).
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