Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!
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The force of viscosity acting on a smooth sphere in stream line motion can be expressed with Stokes' formula:
F = 6 π η r v (1)
where
F = force (N)
η = viscosity of fluid
r = radius of sphere (m)
v= relative velocity between fluid and sphere (m/s)
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