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Overview

The cavitation number ($Ca$) predicts the onset of cavitation in fluid systems. When the local pressure drops below the vapor pressure, cavitation bubbles form.

Variables

Symbol	Description	Unit
$Ca$	Cavitation number	—
$P$	Local static pressure	Pa
$P_v$	Vapor pressure	Pa
$\rho$	Fluid density	kg/m³
$v$	Flow velocity	m/s

Formula

$Ca = \frac{P - P_v}{\frac{1}{2}\rho v^2}$

Calculator

Notes

• Results are approximate and should be verified for critical applications
• Input values should be within reasonable engineering ranges

References

• Original Source