期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 88, 期 -, 页码 361-375出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2017.06.017
关键词
Oil-gas-water three-phase flow; Bubbly flow; Local flow characteristics; Dynamic instability; Bi-optical fiber probe; High-resolution conductance sensor
资金
- National Natural Science Foundation of China [51527805, 11572220]
In the present study, experiments are carried out to investigate local gas phase characteristics of bubbly oil-gas-water flows in a vertical upward pipe with small inner diameter (ID). Bi-optical fiber probe signals at different radial positions and leading and rear half-ring conductance sensor fluctuation signals are collected in a 20 mm ID test pipe. Then flow parameters, including local gas volume fraction, gas velocity and bubble size distribution are extracted according to optical probe signals. The results show that the gas phase superficial velocity, mixture superficial velocity of oil and water as well as mixing ratio of oil and water all have significant impacts on the distribution of gas phase flow parameters. Additionally, in order to validate the results obtained from optical probe signals, multi-scale cross entropy (MSCE) algorithm is applied to analyze signals of high-resolution half-ring conductance sensor to uncover the dynamical instability of oil-gas-water bubbly flows under different flow conditions. (C) 2017 Elsevier Inc. All rights reserved.
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