Scroll Design?

[Allen-in-Sheboygan]

Has anyone considered a design where the wall follows a scroll pattern?  The drop slot would follow the outside of the path defined by the scroll and gradually narrow as it got further inside.  This would force the flow path to be longer and the inner area of the scroll would have a tight radius to increase the centrifugal force on the particles?

[retired2]

Has anyone considered a design where the wall follows a scroll pattern?  The drop slot would follow the outside of the path defined by the scroll and gradually narrow as it got further inside.  This would force the flow path to be longer and the inner area of the scroll would have a tight radius to increase the centrifugal force on the particles?

"Don_Z" built one, but he said it did not work so he scrapped it.  I have no idea what it looked like or how it was built, he never gave any details.  I'm not sure if he is still following this forum or not.  You might try sending him a private message and aee if he replies.

[WayTooLate]

Allen -
     Phil's discussion about a curved side entry is scroll-like.  However, in the Thien Separator, the air needs to make a few rotations before the fines (as many as possible) are dropped out.  A scroll would have to get it all within its single path. 
     In reality, a tapered cyclone cone mimics a scroll design.  As the air path moves down, it gets an increasingly smaller radius increasingly forcing the fines to the exterior.  Think of it as a 'vertical scroll'. 
     Clear as mud?
     - Jim