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Design of Stairmand-type sampling cyclones.

M E Moore1, A R McFarland

  • 1Department of Mechanical Engineering, Texas A&M University, College Station 77843.

American Industrial Hygiene Association Journal
|March 1, 1990
PubMed
Summary

A new correlation for Stairmand cyclones links cut-point Stokes number (Stk0.5) and Reynolds number (Re), crucial for aerosol sampling. Froude number (Fr) did not affect this relationship across tested conditions.

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Area of Science:

  • Aerosol science and particle technology
  • Fluid dynamics and particle separation

Background:

  • Stairmand cyclones are widely used for particle sampling.
  • Accurate performance prediction requires understanding the relationship between key dimensionless parameters.

Purpose of the Study:

  • To establish an empirical, nondimensional correlation for small Stairmand-type sampling cyclones.
  • To investigate the influence of Froude number on cyclone performance.
  • To provide data on particle deposition and transmission within the cyclone.

Main Methods:

  • Tested four Stairmand cyclones (38-140 mm body diameter) with monodisperse aerosols (3.0-17.4 µm).
  • Varied flow rates to achieve Froude numbers of 1.5, 2.0, 2.5, and 6.0.
  • Determined Reynolds numbers ranging from 2.1 x 10³ to 6.4 x 10⁴.

Main Results:

  • Developed an empirical correlation between cut-point Stokes number (Stk0.5) and Reynolds number (Re).
  • Found no significant effect of Froude number on the Stk0.5-Re correlation within the tested range.
  • Data fitted to a quadratic logarithmic function using least squares.
  • Observed minimal difference (0.5%) in carryover between solid and liquid particles of the same size.

Conclusions:

  • The established Stk0.5-Re correlation is applicable to small Stairmand cyclones.
  • Cyclone performance, in terms of cut-point, is independent of Froude number for the conditions studied.
  • Results offer insights into particle deposition and transmission, aiding cyclone design and application.

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