Stokes' Law

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Stokes' law, abbreviated as St, is the force that is put on a small sphere, slowing down the movement through a viscous fluid.

 

Stokes' law formula

\(\large{ F =  6 \; \pi \; r \; n \; v   }\) 

Where:

 Units English Metric
\(\large{ F }\) = force \(\large{ lbf }\) \(\large{N}\)
\(\large{ \pi }\) = Pi \(\large{3.141 592 653 ...}\)
\(\large{ r }\) = radius of sphere \(\large{ ft }\) \(\large{ m }\)
\(\large{ v }\) = velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)
\(\large{ n }\) = viscosity \(\large{\frac{lbf-sec}{ft^2}}\) \(\large{\frac{m}{s}}\)

 

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Tags: Force Equations