Cavitation Number

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	\(\large{\frac{lbf}{in^2}}\)	\(\large{Pa}\)

 

Cavitation Number Calculator