Stokes Settling Velocity Calculator
Terminal settling speed of a small particle in liquid or gas (Stokes' law).
100 µm sand settles ~8 mm/s in water — the basis of clarifier surface-loading rates and dust-settlement times.
Formula
Stokes Settling Velocity Calculator is a free stokes law for process, mechanical and water engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Stokes Settling Velocity Calculator
Terminal settling speed of a small particle in liquid or gas (Stokes' law). The calculation implements v_s = (ρ_p − ρ_f)·g·d² / (18·μ) (Perry's Chemical Engineers' Handbook, §6 — particle dynamics). 100 µm sand settles ~8 mm/s in water — the basis of clarifier surface-loading rates and dust-settlement times.
How to use Stokes Settling Velocity Calculator
- 1Enter Particle diameter in µm.
- 2Enter Particle density in kg/m³ (Sand/silica = 2,650).
- 3Enter Fluid density in kg/m³.
- 4Enter Fluid viscosity in mPa·s (cP).
- 5Read Settling velocity, Particle Reynolds no. instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Stokes Settling Velocity Calculator?
- ✓Implements the standard formula — v_s = (ρ_p − ρ_f)·g·d² / (18·μ)
- ✓Reference cited on-page: Perry's Chemical Engineers' Handbook, §6 — particle dynamics
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Stokes Settling Velocity Calculator use?+
It computes v_s = (ρ_p − ρ_f)·g·d² / (18·μ), per Perry's Chemical Engineers' Handbook, §6 — particle dynamics. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
100 µm sand settles ~8 mm/s in water — the basis of clarifier surface-loading rates and dust-settlement times.
Does this work for any fluid?+
Yes — density and viscosity are inputs (with common fluids suggested in the field hints), so the same physics applies to water, oils, gases and process fluids. Compute always runs in SI internally, so unit mix-ups can't corrupt the result.
Is the Stokes Settling Velocity Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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