Flow regime transition criteria for two-phase flow at reduced gravity conditions

Situ, R., Hibiki, T., Brown, R.J., Hazuku, T., and Takamasa, T. (2011) Flow regime transition criteria for two-phase flow at reduced gravity conditions. International Journal of Multiphase Flow, 37 (9). pp. 1165-1177.

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Flow regime transition criteria are of practical importance for two-phase flow analyses at reduced gravity conditions. Here, flow regime transition criteria which take the frictional pressure loss effect into account were studied in detail. Criteria at reduced gravity conditions were developed by extending an existing model from normal gravity to reduced gravity conditions. A comparison of the newly developed flow regime transition criteria model with various experimental datasets taken at microgravity conditions showed satisfactory agreement. Sample computations of the model were performed at various gravity conditions, such as 0.196, 1.62, 3.71 and 9.81 m/s2 corresponding to micro-gravity and lunar, Martian and Earth surface gravity, respectively. It was found that the effect of gravity on bubbly–slug and slug–annular (churn) transitions in a two-phase flow system was more pronounced at low liquid flow conditions, whereas the gravity effect could be ignored at high mixture volumetric flux conditions. While for the annular flow transitions due to flow reversal and onset of droplet entrainment, higher superficial gas velocity was obtained at higher gravity level.

Item ID: 19691
Item Type: Article (Research - C1)
ISSN: 1879-3533
Keywords: flow regime; transition; reduced gravity; microgravity; multiphase flow; two-phase flow
Date Deposited: 30 Jan 2012 01:42
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes: 85 ENERGY > 8507 Energy Conservation and Efficiency > 850799 Energy Conservation and Efficiency not elsewhere classified @ 50%
85 ENERGY > 8504 Energy Transformation > 850403 Nuclear Energy @ 50%
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