There are distinct advantages to two-phase thermal control systems in high power space platforms, but more development is required before integration of such systems can be accomplished. The first step is the development of accurate flow regime transition models. While much work has been accomplished in this area, the models are still semi-empirical or emprical. A new method for calculating the adiabatic transition from slug to annular flow in a microgravity environment is presented. The model is based on a physical balance of inertial and surface tension forces in a manner more physically meaningful than in typical two phase Weber number relationships used in the past. A comparison of this model with other microgravity slug to annular transition models is demonstrated. This new model and other models are compared with data collected in microgravity in parabolic trajectory flight aboard the NASA KC-135 and the NASA Learjet.
Slug to annular flow regime transition modeling for two-phase flow in a zero gravity environment
Entwicklung von Übergangsmodellen von zäher Strömung zu Ringströmung für Zweiphasenströmungen in einer schwerelosen Umgebung
1995
6 Seiten, 9 Bilder, 14 Quellen
Conference paper
English
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