How smooth need a cyclone inner cone be?


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
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Smooth is very important. Cyclone design is incredibly complicated....good luck. Dave

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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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hylourgos wrote:

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
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Enoch Root wrote:

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.
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hylourgos wrote:

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
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