Drift‐flux model for gas–liquid flow subjected to centrifugal fields

• Published in: AIChE journal Vol. 68; no. 2
• Main Authors: Penteado, Marcos R. M., Vieira, Saon C., Castro, Marcelo S., Bannwart, Antonio C.
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01.02.2022; American Institute of Chemical Engineers
• Subjects: bubbles characteristics; Centrifugal pumps; Drift; drift‐flux model; electric submersible pump; Flow rates; Fluid flow; gas locking; gas–liquid flows; Impellers; Liquid flow; Locking; Mass flow rate; Oil and gas industry; surging; two‐phase flow
• ISSN: 0001-1541; 1547-5905
• DOI: 10.1002/aic.17448

Centrifugal pumps are used in several industrial processes. It is common the operation of this equipment with gas–liquid mixtures, which is the case of the electrical submersible pumping artificial lift method used in the oil industry. The increase of free gas fraction inside the pump may lead to unstable operation and problems such as surging and gas locking phenomena to occur. In this study a drift‐flux model is proposed for the gas–liquid flow subjected to centrifugal fields using the impeller as an example. The model is closed with experimental data of bubble diameter, displacements and velocities acquired via high‐speed camera at several different rotational speeds and gas mass flow rates using water as the continuous medium. From the modeling and the forces balance in the bubbles, quantitative criteria for the start point of surging and gas locking conditions were proposed.