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Originally Posted by JWFokker
But the question is, what (flawed) logic did I use when making that decision?
I got 3/8" tubing because ...higher fluid velocity resulting from the smaller diameter tubing.
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You may find a flaw in the "higher fluid velocity" part.
Yes, your fluid is moving faster in the smaller ID hose, but that does not necessarily translate to higher velocity in the water block, where it counts (not that the 6000 seems to need high velocity anyway).
If anything, the higher velocity in the narrower tubing will translate into higher friction, which, in turn will cause lower overall system flow, which means lower fluid velocity in your waterblock.
IMHO, the tubing runs we use in PCs are so short that it doesn't really make much difference between 3/8 and 1/2, but I'd be careful about thinking about 3/8" tubing as something that improved flow.
Bob
PS: If you are thinking about automotive velocity stacks and or / exhaust headers and how diameter/length plays into that, that is
impulse flow and not at all the same (not to mention that, for the exhaust, the speed of sound in hot gas plays a part as well...)