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Which of these is not an assumption made when we derive the equation h + V^2/2 = constant?

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Which of these is not an assumption made when we derive the equation h + V^2/2 = constant?

(a) Inviscid flow

(b) Steady flow

(c) Adiabatic flow

(d) Liquid flow

This question was addressed to me in final exam.

My doubt is from Definition of Total Stagnation Conditions topic in portion Compressible Flow – Preliminary Aspects of Aerodynamics

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Correct choice is (d) Liquid flow

The explanation is: For an inviscid, adiabatic and steady flow we can show that h + V^2/2 = constant. This is valid along any streamline. It does not take into account the flow being a liquid flow and is valid for gaseous flows also.

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