stokes law F=6πeta rv .Is this formula is only applicable for sphere.?
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Stoke’s Law is a mathematical equation that expresses the settling velocities of the small spherical particles in a fluid medium. The law is derived considering the forces acting on a particular particle as it sinks through the liquid column under the influence of gravity. The force that retards a sphere moving through a viscous fluid is directly proportional to the velocity and the radius of the sphere, and the viscosity of the fluid. Sir George G. Stokes, an English scientist expressed clearly the viscous drag force F as:
F=6πηrv
Stokes’s law finds application in several areas such as:
Settling of sediment in freshwater
Measurement of the viscosity of fluids
In the next section, let us understand the derivation of Stoke’s Law.
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