Theoretical and empirical models for the gas void fraction (α) are reviewed. Simple rules are developed for obtaining rational bounds for the void fraction in two-phase flow. The lower bound is based on the separate cylinders formulation for turbulent-turbulent flow that uses the Blasius equation to predict the Fanning friction factor. The upper bound is based on the Butterworth relationship that represents well the Lockhart-Martinelli correlation. These two bounds are reversed in the case of liquid fraction (1−α). The bounds models are verified using published experimental data of void fraction versus mass quality at constant mass flow rate. The published data include different working fluids such as R-12 and R-22 at different pipe diameters, different pressures, and different mass flow rates. It is shown that the published data can be well bounded for a wide range of mass qualities, pipe diameters, pressures and mass flow rates. Further comparisons are made using the published experimental data of void fraction (α) and liquid fraction (1−α) versus the Lockhart-Martinelli parameter (X), for different working fluids such as R-12, R-22 and air-water mixtures.
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ASME 2005 International Mechanical Engineering Congress and Exposition
November 5–11, 2005
Orlando, Florida, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4219-3
PROCEEDINGS PAPER
Bounds on Two-Phase Flow: Part II — Void Fraction in Circular Pipes
M. M. Awad,
M. M. Awad
Memorial University of Newfoundland
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Y. S. Muzychka
Y. S. Muzychka
Memorial University of Newfoundland
Search for other works by this author on:
M. M. Awad
Memorial University of Newfoundland
Y. S. Muzychka
Memorial University of Newfoundland
Paper No:
IMECE2005-81543, pp. 823-833; 11 pages
Published Online:
February 5, 2008
Citation
Awad, MM, & Muzychka, YS. "Bounds on Two-Phase Flow: Part II — Void Fraction in Circular Pipes." Proceedings of the ASME 2005 International Mechanical Engineering Congress and Exposition. Fluids Engineering. Orlando, Florida, USA. November 5–11, 2005. pp. 823-833. ASME. https://doi.org/10.1115/IMECE2005-81543
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