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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
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 , particles will continue in a straight line as the fluid turns around the obstacle therefore impacting on the obstacle. For , particles will follow the fluid streamlines closely.
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|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.|