"Bob La Londe" wrote in message
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"Bob La Londe" wrote in message
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Ok... I'm still mulling over the possibility of a Hilsch tube on one of
my machines as the coolant and to blow chips away from the cutter. I see
many commercial ones are made out of stainless, but that just isn't in my
plans if I make one. Stainless is beyond my easy working level.

I have some large aluminum bar stock laying around, (left over from
another project) and I was thinking I could turn one out of it. My
quandry is in this. I only ran across a few mentions of heat sinking in
regards to Hilsch tubes. One article said to heat sink the whole thing.
I think they just meant the whole heat separator/exchangers side of it.
It would be counter intuitive to heat sink the cold air outlet tube. I
would think you would want to insulate that. The thing is the physics of
it is beyond me. I get the basics of both principle said to be at work.
It's the details.

I could easily turn heat sink fins on the outside. I just wonder if that
will provide a lower ouput temperature, or if somehow it might reduce the
efficiency of the design somehow?

There seems to be two designs out there. One has a circular passage with
angled holes drilled into the main tube. The other has a lopsided cam
lobe shaped chamber to spin the air. Any idea which one is more
efficient?


They both are terribly inefficient even if you also have a use for the hot
side