GATE ME 2020 Set 1 — Question 24
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Fluid Mechanics → Dimensional Analysis & Similitude → Dimensionless Numbers
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Question
Froude number is the ratio of
Correct answer
(D) inertia forces to gravity forces
Solution
The Froude number () is a dimensionless parameter used in fluid mechanics to characterize the resistance of an object moving through a fluid, or the flow of a fluid. It is defined as the ratio of inertia forces to gravity forces:where is the characteristic velocity, is the acceleration due to gravity, and is the characteristic length. Squaring the Froude number gives the direct ratio of inertia force to gravity force.
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