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Stokes Law for Spherical Drag

Stokes Law for Spherical Drag Equation


$$ F_d = 6 \pi \mu r v $$ where:

Fd   =   Drag Force   (N)

μ   =   Dynamic Viscosity   (Pa s)

r   =   Radius of the sphere   (m)

v   =   Flow velocity   (m/s)


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Equation Assumptions


  • The particle size is small.
  • Flow around the particles is laminar.
  • The geometry is spherical.
  • The fluid is newtonian.
  • There are no energy losses.