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Cavitations Number
An introduction to and a definition of the Cavitations Number
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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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Related Topics
- Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.
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Related Documents
- Cavitation - an Introduction - Cavitation may occur in fluid flow systems where local static pressure is below the vapor pressure
- Control Valves and Cavitation - Control valves and cavitation, application ratio and multi stage control valves
- Euler Number - An introduction and definition of the Euler Number in fluid mechanics
