My workplace had a USEPA-approved training course on control of particulate emissions a few weeks ago. I’ll check the course notes to see if there’s something that’ll help.
Edit:
@txjennah if you’re interested, I can scan the chapter on cyclones from the course and PM a link to you (if you don’t mind my scribbles). Better to be last-minute than not sharing anything that could be useful.
Also, the “best” equation for effective number of turns is in Cooper & Alley, 4th ed. I say “best” because it’s what NCEES uses for their solution in their practice exam.