Question

Which among the following is an assumption of the compressible flow?

(a) Resistance to flow of object

(b) No-slip condition

(c) Known mass flow rate

(d) Resistance to flow of heat

The question was asked in an online quiz.

My doubt is from Flow of Compressible Fluid through Orifices and Nozzles topic in section Compressible Flow of Fluid Mechanics

Answer 1

Correct answer is (b) No-slip condition

To explain: The related assumption of a compressible fluid flow is No-slip condition. It is assumed that the flow velocity at the solid surface is equal to the velocity of the surface itself. It is in direct consequence of the continuum flow.