Froudes Number
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Froude’s Number
The square root of the ratio of inertia force and gravitational force is called Froude’s number. It is denoted by Fr.
Fr = √ Inertia force / Gravitational force
= √ Mass x Acceleration / Mass x Acceleration due to gravity
= √ Velocity / time / Accleration due to gravity
= √ V / T / g V = L / T T = L / V
= √ V / L/V . g = √ V2 / L. g
Fr = V / √ L.g
Fr = √ Inertia force / Gravitational force
= √ Mass x Acceleration / Mass x Acceleration due to gravity
= √ Velocity / time / Accleration due to gravity
= √ V / T / g V = L / T T = L / V
= √ V / L/V . g = √ V2 / L. g
Fr = V / √ L.g
Application:
Open hydraulic structure such as spillways, weirs, open channel flow, sluices etc. in which force due to gravity are predominant.
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