I'm designing a cyclone-on-a-budget, and right now leaning toward using
some thick walled plastic barrels as the basis. For the cone I would
make about 4 triangular cuts from the bottom to about 2/3 the way to
the top, then plastic weld the cuts together to form a cone.
But that would make the cone section not exactly circular in diameter.
I can fiddle with the smoothness (circularity?) a bit by making more
triangular cuts or by heating and shaping the plastic, but it will
never turn out as smooth as a sheet metal fabricated cone.
So, if you engineers out there can tell me how important the cyclone's
circular-diameter smoothness is, I can proceed or trash this idea.
Thanks,
H
"hylourgos" <[email protected]> wrote in message
news:[email protected]...
> I'm designing a cyclone-on-a-budget, and right now leaning toward using
> some thick walled plastic barrels as the basis. For the cone I would
> make about 4 triangular cuts from the bottom to about 2/3 the way to
> the top, then plastic weld the cuts together to form a cone.
>
> But that would make the cone section not exactly circular in diameter.
> I can fiddle with the smoothness (circularity?) a bit by making more
> triangular cuts or by heating and shaping the plastic, but it will
> never turn out as smooth as a sheet metal fabricated cone.
>
> So, if you engineers out there can tell me how important the cyclone's
> circular-diameter smoothness is, I can proceed or trash this idea.
>
> Thanks,
> H
I don't think the cone section at the bottom will have a huge effect. Its
only job is to collect the chips and guide them into a bin. However, I
would think the cylinder sides and input/output pipes have the most
influence on the cyclones efficiency.
Dave
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Enoch Root wrote:
> hylourgos wrote:
>
> > So, if you engineers out there can tell me how important the cyclone's
> > circular-diameter smoothness is, I can proceed or trash this idea.
>
> IANAE, but I think you want laminar flow on the way in. The chips/dust
> filter down through the layers of air by gravity to slide on the surface
> into the receiver. This would serve to protect their downward movement
> from the turbulence of the upward exhaust air.
>
> Or as laminar as you can manage.
>
For pneumatic conveyance you want turbulent flow all the
way into the collector. Otherwise material accumulates
along the bottom inside surface of the duct. Once in the
hopper, you want the EXIT flow to be a slow as possible,
laminar if possible so as to carry as little material out of
the hopper as possible.
--
FF
hylourgos wrote:
> So, if you engineers out there can tell me how important the cyclone's
> circular-diameter smoothness is, I can proceed or trash this idea.
IANAE, but I think you want laminar flow on the way in. The chips/dust
filter down through the layers of air by gravity to slide on the surface
into the receiver. This would serve to protect their downward movement
from the turbulence of the upward exhaust air.
Or as laminar as you can manage.
er
--
email not valid
hylourgos wrote:
> So, if you engineers out there can tell me how important the cyclone's
> circular-diameter smoothness is, I can proceed or trash this idea.
IANAE, but I think you want laminar flow on the way in. The chips/dust
filter down through the layers of air by gravity to slide on the surface
into the receiver. This would serve to protect their downward movement
from the turbulence of the upward exhaust air.
Or as laminar as you can manage.
er
--
email not valid
On 15 May 2006 01:32:55 -0700, "hylourgos" <[email protected]> wrote:
>So, if you engineers out there can tell me how important the cyclone's
>circular-diameter smoothness is,
It isn't.
I've made cyclones out of any old rubbish. They all worked. Smoother
might be "better", but don't let anyone tell you it has to be neat to
still be useful.
Smooth is very important. Cyclone design is incredibly complicated....good
luck.
Dave
"hylourgos" <[email protected]> wrote in message
news:[email protected]...
> I'm designing a cyclone-on-a-budget, and right now leaning toward using
> some thick walled plastic barrels as the basis. For the cone I would
> make about 4 triangular cuts from the bottom to about 2/3 the way to
> the top, then plastic weld the cuts together to form a cone.
>
> But that would make the cone section not exactly circular in diameter.
> I can fiddle with the smoothness (circularity?) a bit by making more
> triangular cuts or by heating and shaping the plastic, but it will
> never turn out as smooth as a sheet metal fabricated cone.
>
> So, if you engineers out there can tell me how important the cyclone's
> circular-diameter smoothness is, I can proceed or trash this idea.
>
> Thanks,
> H
>