For an isentropic flow, entropy density can vary between different streamlines.
2.
This means that a homentropic flow is necessarily isentropic, but an isentropic flow need not be homentropic.
3.
There are numerous applications where a steady, uniform, isentropic flow is a good approximation to the flow in conduits.
4.
For an isentropic flow of a perfect gas, several relations can be derived to define the pressure, density and temperature along a streamline.
5.
It distinguishes itself from an isentropic or particle isentropic flow, where the entropy level of each fluid particle does not change with time, but may vary from particle to particle.
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