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Old 27th December, 2004, 04:39 PM
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Quote:
Originally Posted by Kaitain
This is the problem with concept design. You get very fast heat transfer if the water flows quickly through the radiator.
Really? Why? Is it due to the increased turbulence at the boundary reducing the boundary layer?

Quote:
Originally Posted by Kaitain
In addition its liquid capacity will be rather high. I rather suspect that on entering the radiator and separating into each of the two passes, the water slows to a snail's crawl and spends a very long time being cooled at low efficiency.
Yup, that's about the size of it.

Quote:
Originally Posted by Kaitain
It's empirical, so just gives a rough answer...
As you can see, a 180 degree std radius U bend (most common in made-for-watercooling radiators) gives a pressure drop of up to 80 pipe diameters per bend. A well chosen valve results in a pressure drop of a tenth that.
Empirical answers are still useful for getting a feel for the nature of the problem, though. Thanks for posting this. This is good info.
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