non-viscous fluid

The above holds true only for non-viscous fluids.

For example, for a non-viscous fluid, the mechanical work done on the system may be related to the pressure p and volume V.

The gas flow is isentropic i.e., at constant entropy, as the result of the assumption of non-viscous fluid, and adiabatic process.

G0340 Geostrophic equilibrium Condition of the field of motion of a non-viscous fluid in which the pressure gradient force is exactly balanced by the Coriolis force.

For turbulent, non-viscous fluids the Dittus-Boelter Equation can be used to determine the heat transfer coefficient for both the inner and outer streams; given their diameters and velocities (or flow rates).