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Oseen's approximation : ウィキペディア英語版
Oseen's approximation

In 1910 Carl Wilhelm Oseen proposed what became known as Oseen's approximation, to treat problems of fluid dynamics in which a flow velocity field involves a small disturbance of a constant mean flow, as in a stream of liquid. His work was based on the experiments of G.G. Stokes, who had studied a sphere of radius "a" falling in a fluid of viscosity \mu\,. Oseen developed a correction term, which included inertial factors, for the flow velocity used in Stokes' calculations, to solve the problem. His approximation lead to an improvement to Stokes' calculations.
==Importance==
The method and formulation for analysis of flow at a very low Reynolds number is important. The slow motion of small particles in a fluid is common in bio-engineering. Oseen's drag formulation can be used in connection with flow of fluids under various special conditions, such as: containing particles, sedimentation of particles, centrifugation or ultracentrifugation of suspensions, colloids, and blood through isolation of tumors and antigens. The fluid does not even have to be a liquid, and the particles do not need to be solid. It can be used in a number of applications, such as smog formation and atomization of liquids.

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