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Multiphase Science and Technology

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ISSN Druckformat: 0276-1459

ISSN Online: 1943-6181

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TRANSIENT GAS/LIQUID TWO-PHASE FLOW IN A PIPELINE-RISER SYSTEM AFTER THE CHANGE OF INLET FLOW RATES

Volumen 32, Ausgabe 1, 2020, pp. 25-46
DOI: 10.1615/MultScienTechn.2020031553
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ABSTRAKT

Transient gas/liquid two-phase flow caused by the change of inlet gas and/or liquid flow rates was experimentally studied in a 380-meter-long pipeline-riser system with a vertical riser of 21.5 meters in height. Results showed that, for the transient processes with the same median flow rates, the rise of flow rates was likely to result in shorter duration time compared to the fall of flow rates. Apart from the manner of change, the duration time was also closely related to the flow mechanism, which varied with the global flow regime. As a consequence, the transient process lasted a longer time around the transition boundary of stable regime and the severe slugging regime; whereas, the transient process would be shorter if the regime was an irregular oscillation; and the longest transient process was found at very low gas and liquid flow rates. As for the prediction of duration time of both the entire transient process and the transition to undesirable flow regimes, the support vector machine turned out to be much more suitable than the log-linear regression. In addition, some similarities of pressure drop signals were found between the transition to unstable and irregular flow regimes and the steady state of these regimes. Since the method for fast recognition of a steady global flow regime has already been developed, it becomes possible to forecast the transition to these undesirable flow regimes through the modification of the recognition method.

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REFERENZIERT VON
  1. Zou Suifeng, Guo Liejin, Yao Tian, Upstream-flow-based mechanisms for global flow regime transition of gas/liquid two-phase flow in pipeline-riser systems, Chemical Engineering Science, 240, 2021. Crossref

  2. Wu Quanhong, Zou Suifeng, Zhang Xuemei, Yang Chenyu, Yao Tian, Guo Liejin, Forecasting the transition to undesirable gas-liquid two-phase flow patterns in pipeline-riser system: A method based on fast identification of global flow patterns, International Journal of Multiphase Flow, 149, 2022. Crossref

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