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If the pressure remains a constant, then ________

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+1 vote
in Fluid Mechanics by (118k points)
If the pressure remains a constant, then ________

(a) Vr1 > Vr2

(b) Vr1 < Vr2

(c) Vr1 = Vr2

(d) Vr1 is a zero

I got this question during an internship interview.

The doubt is from Force Exerted by a Jet on a Series of Vanes topic in portion Impact of Jets and Jet Propulsion of Fluid Mechanics

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Best answer
Correct answer is (c) Vr1 = Vr2

To elaborate: The relative velocity of the jet is denoted as Vr1. It is the relative velocity at the inlet to the vane. Relative velocity of inlet to the vane is obtained by subtracting vectorially the velocity of the vane with its absolute velocity. It happens in the same way for Vr2. Thus, If the pressure remains a constant, then Vr1 = Vr2.

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