// multi-utility computation suite · offline · instant · precise
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sci.stokes-law-settling Calculator
Calculates the terminal settling velocity of spherical particles in a viscous fluid using Stokes' law: v = (2r²Δρg)/(9η). Stokes' law applies for particle Reynolds number Re < 1 — a 10 µm dust particle in air settles at ~3 mm/s; 1 µm particles settle too slowly for gravitational sedimentation.
Inputs
Particle Diameter Um
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Particle Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Fluid Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Viscosity Mpas
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.