Stokes' law

From WikiLectures


During sedimentation, the particle is exposed to gravity (F g = mg = V ρ particle g) and buoyancy force according to Archimedes' law (F vz = V ρ liquid g). When the density of the particle is greater than the density of the liquid, the particle begins to sink .

Its movement is opposed by a resistance force , given by the Stokes relation:

where r = radius of the particle, η = dynamic viscosity of the medium , v = velocity of the particle.


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