斯托克斯沉降计算器 — 公式

## Stokes Settling (Low Reynolds Number)

Very small particles settle through a fluid at a terminal velocity governed by Stokes' law.

### Formula

**v_s = 2 (rho_p - rho_f) g r^2 / (9 mu)**

- *rho_p* = particle density
- *rho_f* = fluid density
- *r* = particle radius
- *mu* = dynamic viscosity

This applies when Re < 1 (creeping flow regime). Larger particles settle faster because velocity scales as r^2.