Cavitation number σ

Design requirements


No cavitation protection is required

0.25 - 1.80

The flow surface can be protected by flow surface treatment (e.g. smoothing all surface roughness)

0.17 - 0.25

Modification of the design (e.g. increasing boundary curvature)

0.12 - 0.17

Protection by addition of aeration grooves or steps


Surface cannot be protected and a different configuration is required (assumption)