An introduction to and a
definition of the Cavitations Number
The Cavitations 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
Cavitations Number is useful analyzing fluid flow dynamics problems where
cavitations may occur.
The
Cavitations Number can be expressed as
σ = (pr
- pv) / (1/2 ρ v2) (1)
where :
σ =
Cavitations number
pr =
reference pressure (Pa)
pv =
vapor pressure of the fluid (Pa)
ρ =
density of the fluid (kg/m3)
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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