Cavitation Number

on . Posted in Dimensionless Numbers

Cavitation number, abbreviated Ca, a dimensionless number, expresses the relationship between the difference of a local absolute pressure from the vapor pressure and the kinetic energy per volume.


Cavitation number formula

\(\large{ Ca = \frac{ 2\; \left(p \;-\;p_v \right) }{\rho\; U^2}  }\)
Symbol English Metric
\(\large{ Ca }\) = Cavitation number \(\large{ dimensionless }\)
\(\large{ U }\) = characteristic velocity of flow \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)
\(\large{ \rho }\)  (Greek symbol rho) = density of fluid \(\large{\frac{lb}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)
\(\large{ p }\) = local pressure \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ p_v }\) = vapor pressure \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)


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Tags: Pressure Equations Pump Equations