Recognition and measurement gas-liquid two-phase flow in a vertical concentric annulus at high pressures

The air-water flow characteristics under pressure in the range of 1–6 MPa in a vertical annulus were evaluated in this report. Time-resolved bubble rising velocity and void fraction were also measured using an electrical void fraction meter. The results showed that the pressure has remarkable effect...

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Bibliographic Details
Published in:Heat and mass transfer 2018-02, Vol.54 (2), p.353-362
Main Authors: Li, Hao, Sun, Baojiang, Guo, Yanli, Gao, Yonghai, Zhao, Xinxin
Format: Article
Language:English
Subjects:
Annular flow
Annuli
Bubbles
Engineering
Engineering Thermodynamics
Flow characteristics
Heat and Mass Transfer
Industrial Chemistry/Chemical Engineering
Original
Pressure effects
Thermodynamics
Two phase flow
Void fraction
Water flow
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Summary:The air-water flow characteristics under pressure in the range of 1–6 MPa in a vertical annulus were evaluated in this report. Time-resolved bubble rising velocity and void fraction were also measured using an electrical void fraction meter. The results showed that the pressure has remarkable effect on the density, bubble size and rise velocity of the gas. Four flow patterns (bubble, cap-bubble, cap-slug, and churn) were also observed instead of Taylor bubble at high pressure. Additionally, the transition process from bubble to cap-bubble was investigated at atmospheric and high pressures, respectively. The results revealed that the flow regime transition criteria for atmospheric pressure do not work at high pressure, hence a new flow regime transition model for annular flow channel geometry was developed to predict the flow regime transition, which thereafter exhibited high accuracy at high pressure condition.
ISSN:0947-7411
1432-1181
DOI:10.1007/s00231-017-2134-0