IT is usual in theory to treat questions on gas‐flow, as if the flow takes place isentropically, i.e. is subject to the law. This is equivalent to assuming the gas is frictionless or non‐viscous: it also implies that the gas is non‐conducting, for in writing down the equations of motion of a particle we must assume there is no transfer of heat to a neighbouring particle if the changes involved are to be even adiabatic. By ‘adiabatic’ we mean there is no heat transfer between the particle considered and neighbouring particles: by ‘isentropic’ we mean there is no change of entropy, so that an isentropic change implies while an adiabatic change does not.
Naylor, V.D. (1951), "Flow of a Compressible Gas with Friction: A Study of the Effects of Friction in Compressible Flow and the Development of a Correction Factor", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 10, pp. 308-310. https://doi.org/10.1108/eb032091Download as .RIS
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