Stokes' Law Calculator
Free calculate drag force on spherical objects in viscous fluids. determine terminal velocity, drag force, and viscosity using stokes' law for low reynolds number flow.
Input Parameters
Water: 0.001 Pa·s, Air: 0.000018 Pa·s
Results
Enter parameters to calculate Stokes' law values
Stokes' Law Formulas
Drag Force
F = 6πηrv
Where:
- • F = drag force (N)
- • η = dynamic viscosity (Pa·s)
- • r = radius (m)
- • v = velocity (m/s)
Terminal Velocity
v = 2r²g(ρₚ - ρf) / (9η)
For sphere falling in fluid
Note
Valid for Re < 1 (low Reynolds number)