Online Stokes formula calculator to calculate stokes number for estimate particles suspended in fluid flow.
The Stokes number is a measure of flow tracer fidelity in particle image velocimetry (PIV) experiments where very small particles are entrained in turbulent flows and optically observed to determine the speed and direction of fluid movement (also known as the velocity field of the fluid). For acceptable tracing accuracy, the particle response time should be faster than the smallest time scale of the flow. Smaller Stokes numbers represent better tracing accuracy;
Formula:
where,
| t0 is the relaxation time of the particle |
| u0 is the fluid velocity of the flow well away from the obstacle |
| l0 is the Characteristic dimension of the obstacle |
| Stk is the Stokes number |