To calculate the Froude number use the formula Fr = u/√(g*Hd), where u is the flow velocity, g is the acceleration due to gravity, and Hd is the hydraulic mean depth.
What is Froude number used for?
The Froude number is a dimensionless parameter measuring the ratio of the flow inertia to the external field. It's used to indicate the influence of gravity on fluid motion.
What is the difference between Reynolds number and Froude number?
The Reynolds number is defined as a ratio of inertial forces to viscous forces (or molecular momentum) occurring in a fluid flow. The Froude number, in contrast, is defined as the ratio of the flow inertia to the external field (mainly gravitational effects) and not to molecular effects.
What does a Froude number of 1 mean?
When the Froude number (Fr) is equal to 1, the flow velocity is equal to the velocity of surface waves. It is also known as the Critical flow. When Fr < 1, the wave velocity exceeds the flow velocity (subcritical flow). When Fr > 1, waves cannot be generated upstream (supercritical flow).