The object of this paper is to consider the critical flow conditions in a convergent nozzle when internal friction is taken into account. The whole of the work throughout the paper refers to frictional flow, but the corresponding formulae for frictionless flow can be not from the results obtained by replacing η∞ by 1, η by γ. Variations of pressure, density and velocity across any transverse section are ignored, so that only the case of one dimensional flow is considered.
Naylor, V.D. (1951), "The Critical Flow of a Gas Through a Convergent Nozzle: A Simple and More Comprehensive Treatment of Throat Conditions in Critical Nozzle Flow", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 6, pp. 160-162. https://doi.org/10.1108/eb032043
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