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Stokes' law
In 1851, George Gabriel Stokes derived an expression for the frictional force exerted on spherical objects with very small Reynolds numbers (e.g., very small particles) in a continuous viscous fluid by solving the small fluidmass limit of the generally unsolvable NavierStokes equations: Additional recommended knowledgewhere:
If the particles are falling in the viscous fluid by their own weight, then a terminal velocity, also known as the settling velocity, is reached when this frictional force combined with the buoyant force exactly balance the gravitational force. The resulting settling velocity is given by: where:
See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Stokes'_law". A list of authors is available in Wikipedia. 