On 2012-03-13, Bob La Londe wrote:
On Mar 13, 8:48*am, "PrecisionmachinisT"
wrote:
"Bob La Londe" wrote in ...





"Bob La Londe" wrote in message
...
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.

[ ... ]

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- Hide quoted text -

The ones which I saw which prompted my experimentation with them
were being developed for use in a tank (tracked military vehicle, not a
container for liquids or compressed air). The cold air was piped into
holes in the top of the crew's helmets, to keep at least their brains
from overheating.

The two drawbacks of these things -- poor efficiency, and lots
of noise -- were not a problem in that environment. Given how much
power it takes to move all that forged iron and steel around, and how
much noise both the engines and the tracks make, the crew would happily
accept the benefit of cool heads. :-)

[ ... ]

Well, I have one small machine running flood coolant, but I would
really like to keep the other machine dry for other reasons. I can
build either design for starting the vortex. I had hoped somebody had
already experimented with them and knew which style produced a greater
temperature differential. I've got the plug design figured out to
make flow adjustment quick and easy, and I can use my NCT for checking
the output temps. I figured to just use a bathroom vent with auto
closing louvers to send the hot air outside and let the cold air
lightly pressurize (its not a sealed system) the cabinet.

Sounds as though you can experiment with both, and let us know
which works better. But I suspect that the cam lobe design is later,
and presumably it either works better, or was designed to get around
patent restrictions on Hilsch's designs. :-)

Enjoy,
DoN.

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