# Cavitation Number

## An introduction to and a definition of the Cavitation Number

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**The Cavitation Number **or Cavitation Parameter is a "special edition" of the dimensionless Euler Number.

- The Euler Number - an introduction to and a definition of the Euler Number

The Cavitation Number is useful when analyzing fluid flow dynamics problems where cavitation may occur.

The Cavitation Number can be expressed as

σ = (p_{r}- p_{v}) / (1/2 ρ v^{2})^{ }(1)

where

σ = Cavitation number

p_{r}= reference pressure (Pa)

p_{v}= vapor pressure of the fluid (Pa)

ρ = density of the fluid (kg/m^{3})

v = velocity of fluid (m/s)

To prevent cavitation

- avoid low pressure - pressurize supply tanks if necessary
- reduce fluid temperature
- use larger suction pipe diameters - reduce minor losses
- use cavitation resistant materials or coatings
- small amounts of air supplied to the suction system may reduce the amount of cavitation damage
- keep available NPSH well above required NPSH.

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