A two phase Mach number description of the equilibrium flow of nitrogen in ducts
Abstract
Some additional thermodynamic properties of the usual two-phase form which is linear in the moisture fraction are derived which are useful in the analysis of many kinds of duct flow. The method used is based on knowledge of the vapor pressure and Gibbs function as functions of temperature. With these, additional two-phase functions linear in moisture fraction are generated, which ultimately reveal that the squared ratio of mixture specific volume to mixture sound speed depends on liquid mass fraction and temperature in the same manner as do many weighted mean two-phase properties. This leads to a simple method of calculating two-phase Mach numbers for various duct flows. The matching of one- and two-phase flows at a saturated vapor point with discontinuous Mach number is also discussed.
- Publication:
-
American Institute of Aeronautics and Astronautics
- Pub Date:
- June 1979
- Bibcode:
- 1979thph.conf.....B
- Keywords:
-
- Ducted Flow;
- Equilibrium Flow;
- Gas Flow;
- Mach Number;
- Nitrogen;
- Two Phase Flow;
- Acoustic Velocity;
- Saturation;
- Temperature Effects;
- Vapor Pressure;
- Fluid Mechanics and Heat Transfer