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Flow over a rocket outside the boundary layer is isentropic.(a) False(b) TrueThe question was asked during an online exam.My enquiry is from A Brief Review of Thermodynamics in division Compressible Flow – Preliminary Aspects of Aerodynamics

Answer»

Correct answer is (b) True

Explanation: The boundary layer regime over flow has dissipative EFFECTS and VISCOSITY. This is not isentropic. But the flow outside has negligible viscosity, dissipative effects. Thus, it is a reversible process to a good APPROXIMATION. Moreover, there is no heat exchange taking PLACE to or from the fluid element, making this an ADIABATIC flow. So, outside the boundary layer, the flow is isentropic.



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