3.8.1 Introduction

This function group computes an isothermal flow through a long ducts as described in [VLStreeter1966] for which neither fanno nor rayleigh flow is applicable due to the assumptions of the two latter.

The following properties are computed:

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Table 6: Isothermal flow properties

I	Property	Description
1		Mach number
2		Non-stagnative ratios
3		Density ratio
5		Velocity ratio
6		Stagnation pressure ratio
6		Stagnation temperature ratio
7		Characteristic line

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