Froude Number

Froude Number

 Froude Number

Definition - Froude Number represents a ratio of inertial forces to the gravitational force.

  • Under laminar flow conditions, the fluid remains stagnant at a distance away from the impeller. In such cases, the Froude number accounts for the force of gravity which determines the fluid motion.

  • Fr = n2Da / g

             Where

             Fr – Froude number

             n – Agitator speed measured in revolutions / second

            Da – Impeller diameters in metres

             g – Acceleration due to gravity, 9.8m/s2

  • Froude number is dimensionless

Related terms – Dimensionless number, Reynolds number

 

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