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If the Froude number in open channel flow is less than 1, then the flow is called ________.
- ACritical flow
- BSuper - critical flow
- CSub - critical flow
- DNone of these
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The Froude number, Fr, is a dimensionless value that describes different flow regimes of open channel flow. The Froude number is defined as the square root of the ratio of inertia force of a flowing fluid to the gravity force.
$({F_r} = \sqrt {\frac{{{F_i}}}{{{F_g}}}} = \frac{V}{{\sqrt {Lg} }})$
When:
Fr = 1, critical flow,
Fr > 1, supercritical flow (fast rapid flow),
Fr < 1, subcritical flow (slow / tranquil flow)
$({F_r} = \sqrt {\frac{{{F_i}}}{{{F_g}}}} = \frac{V}{{\sqrt {Lg} }})$
When:
Fr = 1, critical flow,
Fr > 1, supercritical flow (fast rapid flow),
Fr < 1, subcritical flow (slow / tranquil flow)