Stribeck Regime Check
Position on the Stribeck curve from the Hersey parameter η·N/P - boundary, mixed, or full-film.
Hersey parameter η·N/P
0.0000002500 -
Lubrication regime
Hydrodynamic (full film)
Formula, assumptions, and limits
Stribeck curve plots friction coefficient vs Hersey parameter. At startup + shut-down, engines pass through all three regimes briefly. Design target: full hydrodynamic at operating conditions; friction dip at the mixed-boundary transition.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Dynamic viscosity | Pa·s | oil property | |
| Shaft speed | rev/s | tachometer | |
| Specific bearing load | Pa | load/area |