OK. So far nobody has actually even tried to breach the mystique :-).
I can do all the std stuff.
It just has an unintuitive gap in it. So far.

> that residual voodoo you were complaining about, if you parse finely - I
> think Maxwell had it right - demons...  :)

Maxwell's Demon actually makes sense.
When he introduced the idea he didn't think it through well enough
(unusual for Maxwell) and he failed to realize you could actually
build what he described.

Otherwise known as Hilsch Vortex tube, or Wiebelrohr (sp?) or vortex tube o=
r ...

I built one a decade or so ago. Maybe two ? :-)
Less good than I'd hoped.
May revisit one of these decades.
Certainly fun.
Also noisy and inefficient.

And, heat pumps are still non intuitive :-)

Gargoyles ...
OK, here we go:

http://en.wikipedia.org/wiki/Vortex_tube

http://www.instructables.com/id/The-Hilsch-vortex-tube/

Even hackaday:
http://hackaday.com/2012/05/17/building-a-ranque-hilsch-vortex-cooling-tube=
/

Pictures galore
https://www.google.com/search?q=3Dhilsch+vortex+tube&hl=3Den&tbo=3Du&tbm=3D=
isch&source=3Duniv&sa=3DX&ei=3DPBvfUPiWC8zGmQWAxoGwBQ&sqi=3D2&ved=3D0CE4QsA=
Q&biw=3D2133&bih=3D1201

Aha
This picture is from the article that got me started on this

http://blog.makezine.com/2006/05/11/the-hilsch-vortex-tube/
Here is a copy of the full original
1958
I would have seen it a while after that :-)

             http://www.visi.com/~darus/hilsch/

Commercial one operating - video

   http://www.youtube.com/watch?feature=3Dendscreen&NR=3D1&v=3DwJ6-bnjn9Es

Short but nice paper thereon, 2010

      http://www.me.berkeley.edu/~gtdevera/notes/vortextube.pdf

But heatpumps ...

Anyone get the idea yet that I'm not just talking about basic
mecahnics etc thereof?


          Russell






>
> The book I referenced earlier is a gem of clear thinking on the subject,
> written by two long-serving Columbia University profs. Good stuff.
>
>  Jack
> --
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