vortex coolers, venturis was Re: Any "Best Practice" Rec

Hello,

Look also for vortex coolers; same thing. www.exair.com is one
supplier. They have good technical info.

The venturi effect used to create a vacuum is also related. HF and
others have/had a vac bag/nozzle assy. (to pick up chips)
which "runs" on shop compressed air. They also have vac "pumps" using
the venturi effect selling very inexpensively. look at wood working
dealers for vac clamps...

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., Bill Vance <ccq@x> wrote:
> WRT Coanda air amplifiers, it shouldn't be too difficult, and
though I know the
> general look of one, I don't have any exact specs. Do a search
of, "Coanda
> Effect", and you should find a couple of sites, that go into several
> applications, including rotorless hellicopters, and a search
of, "air
> amplifiers", should turn up several manufacturers. I think the one
in Arizona
> is the one that shows a cut away drawing. They're a little larger
than a T
> fitting for 1.5 inch or so plumbing pipe, and not much more
complicated. Making
> one would be an interesting project, but I doubt that they're much
more than
> $50-$100 bucks apiece. The basic units with slight variations are
used for all
> sorts of sucking/blowing/cooling/etc., applications.
>
> Thermite is generally made with powder sized particles, but if a
heap sits
> around vibrating/oxidizing long enough, who knows?
>
> Bill
>
>
> On Sun Dec 23 09:40:31 2001, Smoke, <smoke@t...> wrote:
>
> >Very interesting! Got any info on how a hobbyist could build one
of these
> >"Coanda" systems?
> >
> >Thermite made from aluminum and steel chips....hmmmmm. That
should raise
> >some ideas!
> >
> >> You need a regular dust collection system, not a shop vac. One
of the
> >best, and
> >> easiest to build is the vortex system, (see
rec.crafts.woodworking
> >archives).
> >> It's the same thing with grain silos; Enough fine particulate
matter plus
> >> commutator/switch sparks equals instant explosion. There are
several ways
> >to
> >> move the air into/from a dust collector, but you want a zero
sparks
> >solution.
> >> One such solution would be to use an air amplifier. These work
on the
> >Coanda
> >> Effect, which has to do with how gasses and liquids move across
a curved
> >> surface. Coanda was one of those multi-discipline geniuses who
lived back
> >> around the early part of the last century. His main gig was
organic
> >chemistry,
> >> but he also designed, built, and flew, the first jet airplane.
An air
> >> amplifier is a three opening unit that acceptss air from a
compressor, and
> >uses
> >> it to induce an airflow into one side, and out the other. The
specs I've
> >seen
> >> indicate that it works on a 1:25 ratio; I.e., a 10 mph flow
from the
> >> compressor equals a 250 mph flow through the device. This spec
is the
> >same
> >> from several manufacturers, so I presume this is the max for
practical air
> >> moving devices, though no doubt the figures and sizes are
different for
> >denser
> >> stuff like liquids.
> >>
> >> While I'm on the subject, try to segregate as much as possible
the results
> >of
> >> your aluminum work from your ferrous metal work. Rust, (ferrous
oxide),
> >mixed
> >> with aluminum oxide equals thermite, which burns, (redox
reaction), in the
> >> neighborhood of 5 or 6 thousand degrees, and has been known to
self
> >ignite.....
> >>
> >> Bill
>
> --
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