Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

Discussion Forum : Hydraulics and Fluid Mechanics - Section 8 (Q.No. 17)
17.
Froude's number is the ratio of inertia force to
pressure force
elastic force
gravity force
surface tension force
Answer: Option
Explanation:
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Discussion:
2 comments Page 1 of 1.

Sid said:   6 years ago
Frauds no = Inertia force/gravitational force.
Match no = Inertia force/elastic force.
Raynaud's no = Inertia force/viscous force.
Webwer no = Inertia force/surface tension force.
Euler's no = Inertia force/pressure force.

Fakhre Alam said:   1 decade ago
The Froude's number, Fr, is a dimensionless value that describes different flow regimes of open channel flow.

The Froude's number is a ratio of inertial and gravitational forces.

Gravity (numerator) - Moves water downhill.
Inertia (denominator) - Reflects its willingness to do so.

Fr = v/(g l)1/2.

Where,

Fr = Froude's number.
v = Velocity.
g = Gravity.
l = Characteristic length.

When:

Fr = 1, critical flow,
Fr > 1, super critical flow (fast rapid flow),
Fr < 1, sub critical flow (slow / tranquil flow).
(1)

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