begin mathsize 48px style F equals space 6 πηrv end style

F= Drag Force ; η = Viscosity Coefficient ; r= Radius of the Particle ; v =  Relative velocity of the Particle ;    

η

r

v

F

 
This calculator deals with the stokes law of viscosity. Here the frictional force (acting between the fluid and the particle) is determined by the viscosity coefficient, radius of the particle and the relative velocity of the particle. For this law to be valid the particles considered must be spherical.         

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