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Learning About Cyclones


:: Section 7

Collection Efficiency

  Section Contents
From the above, we can see that the collection efficiency of a cyclone depends on the competition of two movements: (1) the movement following the circular path of the gas stream; and (2) the outward movement toward the cyclone wall due to centrifugal force (which is perpendicular to the gas stream). The dust collection (due to impaction) occurs if a particle hits the wall before it leaves the system (i.e. before reaching the vortex core). There are two theories developed for the predicting of the collection efficiency of a cyclone, depending upon the model of gas flow in a cyclone. For detailed derivation of the theories, refer to the following references:

  • "Fundamentals of Air Quality Systems: Design of Air Pollution Control Devices", by K. E. Noll, American Academy of Environmental Engineers.
  • "Air Pollution Control: A Design Approach" by C. D. Cooper and F. C. Alley, Waveland Press.
  • "Air Pollution Control Equipment" by L. Theodore and A.J. Buonicore., CRC Press.
  • "The Collection Efficiency of Cyclone Type Particle Collectors - A New Theoretical Approach" by D. Leith and W. Licht, American Institute of Chemical Engineers (AIChE) Symposium Series# 126, Vol. 68, 196-206 (1972)

Only the major equations are summarized in the following sections.