froude число

Overview

The Froude number ($Fr$) is a dimensionless number comparing inertial forces to gravitational forces in open channel flow. It determines the flow regime — subcritical, critical, or supercritical.

Variables

Symbol	Description	Unit
$Fr$	Froude number	—
$v$	Flow velocity	m/s
$g$	Gravitational acceleration	m/s²
$D_h$	Hydraulic depth	m

Formula

$Fr = \frac{v}{\sqrt{g \cdot L}}$

Calculator

Notes

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

References

• Original Source