Re: [Phys-l] Heat transfer lab

[brian whatcott <betwys1@sbcglobal.net>]

On 11/17/2010 11:58 AM, Bernard Cleyet wrote:
> Realizing this (verticality of demo.) I needn't have asked my question, as it'll work w/ any orientation of the rod.  Vertical is best.  (The liquid drips down displacing the vapour?)
>
> bc


I don't want to leave this heap pipe topic without mentioning the 
sensitivity to orientation of heat pipes which depend on the denser 
liquid flowing back down to the hot end under its own weight.
This weight being absent, for example when the pipe is horizontally 
oriented or in space - or more so when the hot end is on top, the 
alternative construction provides a capillary return method - the inside 
sleeve wicking the liquid back,
mentioned in earlier posts.

The other invention of interest is the thermal diode which shows high 
thermal conductivity when one end is hotter than the other - and low 
conductivity when that end is cooler than the other. Mentioned a year 
ago in Arxiv...
 Non-linearity: the next generation of physics? :-)

Brian W