Question

Sum of enthalpy and kinetic energy remains a constant in __________

(a) Polytropic flow

(b) Isentropic flow

(c) Adiabatic flow

(d) Mechanical flow

I had been asked this question by my school teacher while I was bunking the class.

I'm obligated to ask this question of Basic Equations of Compressible Flow topic in division Compressible Flow of Fluid Mechanics

Answer 1

The correct choice is (c) Adiabatic flow

To explain I would say: The sum of enthalpy and kinetic energy remains a constant in adiabatic flow. It performs a similar role that internal energy performs during a nonflowing system. Thus, the correct option is Adiabatic flow.