Re: principle of heat pipe? was Brazing of tungsten

["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>

Tesla list wrote:
 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Michael.Day-at-USPTO.GOV>
 
> John,
 
> A typical heat pipe consists of a seal pipe containing a fluid, such as
> water or freon.  Evaporation and condensation of the fluid is used to
> improve the rate, efficiency, and distance of heat transfer.

	Close.
	There is also a 'wick, a tubular wick down the inside of
	the sealed tube.  Heat 'flows' out by evaporation of the gas,
	then, the fluid (formed when the gas condenses) flows BACk
	up the wicking.

	WHEN IN THEIR RIGHT RANGE a heat pipe will move more
	heat than a solid metal rod. But, see below.

> -----Original Message-----
> From: tesla-at-pupman-dot-com [mailto:tesla-at-pupman-dot-com]
> Sent: Wednesday, August 15, 2001 3:39 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: principle of heat pipe? was Brazing of tungsten
 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <FutureT-at-aol-dot-com>
 
> In a message dated 8/10/01 10:26:27 PM Eastern Daylight Time,
> tesla-at-pupman-dot-com writes:
> 
> > I have considered using an industrial "heat pipe" as a cooling
>>element in static gap, but have not played with it yet. A heat pipe
>>will have hundreds of times better heat transfer ability compared to
>>a solid copper rod of equivalent size.

	Just so.

>> At one time these were novel and quite expensive, butare
> >  now very commonly used in many industrial applications. I sometimes
> >  comeacross them as surplus.

	Be aware that each is designed for a specific range of
	hot and cold end temperatures.  Outside that range, they
	are less effective...  (the choice of working fluid, its
	pressure, choice of the wicking material, etc, etc...)

	One could hand craft one, but it would be a major exercise,
	as the inside needs to be evacuated, filled with a choice
	of working fluid, then sealed.

	best
	dwp