My watch list
my.chemeurope.com  

my.chemeurope.com

With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.

  • My watch list
  • My saved searches
  • My saved topics
  • My newsletter
Register free of charge
Login  
eng  
DeutschEnglishFrançaisEspañol

Stokes number



The Stokes number, named after Irish mathematician George Gabriel Stokes, is a dimensionless number corresponding to the behavior of particles suspended in a fluid flow. Stokes number is defined as the ratio of the stopping distance of a particle to a characteristic dimension of the obstacle, or

Stk = \frac{\tau\,U_o}{d_c}

where τ is the relaxation time of the particle, Uo is the fluid velocity of the flow well away from the obstacle and dc is the characteristic dimension of the obstacle. For Stk\gg 1, particles will continue in a straight line as the fluid turns around the obstacle therefore impacting on the obstacle. For Stk\ll1, particles will follow the fluid streamlines closely.

References

    • Fuks, N. A. (1989). The mechanics of aerosols. New York: Dover Publications. ISBN 0-486-66055-9. 
    • Hinds, William C. (1999). Aerosol technology: properties, behavior, and measurement of airborne particles. New York: Wiley. ISBN 0-471-19410-7. 


    v • d • e
    Dimensionless numbers in fluid dynamics
    Archimedes • Bagnold • Biot • Bond • Brinkman • Capillary • Damköhler • Dean • Deborah • Eckert • Ekman • Eötvös • Euler • Froude • Galilei • Grashof • Hagen • Knudsen • Laplace • Lewis • Mach • Magnetic Reynolds • Marangoni • Morton • Nusselt • Ohnesorge • Péclet • Prandtl • Rayleigh • Reynolds • Richardson • Roshko • Rossby• Ruark • Schmidt • Sherwood • Stanton • Stokes • Strouhal • Suratman • Taylor • Weber • Weissenberg • Womersley
     
    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Stokes_number". A list of authors is available in Wikipedia.
    Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE