Joukowsky Surge Pressure
Water-hammer pressure rise from instantaneous valve closure. Δp = ρ · c · Δv.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Fluid density | kg/m³ | |
| Pressure-wave speed in pipe (depends on pipe modulus) | m/s | |
| Abrupt velocity change | m/s | |
| Peak surge pressure | Pa → bar |
Source: Joukowsky (1898)
In short
Water-hammer pressure rise from instantaneous valve closure.