Re: water filled tubing primary?

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

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

>>Could you (in theory) use water filled (lets say, 1/4 inch)
>>tubing for your primary?

> 	Sure.
> 	However:
> 		Why?
> 	(if heating:
> 		1) Heating of primaries, at most practical
> 		powers is not an issue.
> 		2) Simply filling the tubing with water
> 		will not cool them: the water would need
> 		to be piped OUT of the primary to an
> 		external heat exchanger.  Doable, with
> 		rubber/plastic plumbing, however there is
> 		not (generally) a problem with heating.)
> 
> Actually, copper tubing won't even work too well.

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

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

	best
	dwp

...the net of a million lies...
	Vernor Vinge
There are Many Web Sites which Say Many Things.
	-me