Re: water filled tubing primary?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>


> It will work fine.  Turbulence will make it work
> Modestly Better.

No it won't.  Heat transformer is dramatically reduced.  You need the
turbulence.  Take a block of aluminum with a 1" circular channel wound
through it and then take the same block and put a channel with lots of
cavities, blocks, etc... (and keeping surface area identical), your heat
transfer will be substantially different.

> > Remember, that tubulence needs to be present in air or liquid to
>
> > increase efficiency of heat transfer.
>
> Increase is modest.  Not uncommonly, hassles with
> difficulties in making fins, keeping fins 'clean',
> etc, outweigh the advantages.
> )Hint:
> I have done thermal design.

Obviously not.

> Hint 2:
> Note that heatsinks, while finned, lack 'added roughness'
> on the surface: the gains are too small:

No again.  You run a fan parallel to the fins (little turbulence), you'll
get minumum heat transfer.  Run a fan perpidicular to the fins and you'll
get substantially more heat transfer.

Dan



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