All credit goes to Paul M. Bommer, Ph.D., Department of Petroleum and Geosystems Engineering, The University of Texas at Austin Cockrell School of Engineering. June 2012.
The video demonstrates common water-air flow regimes that can be established in pipes at various water and air flow rates and various angles of pipe inclination.
For more information on multiphase flow regimes, refer to the following article: https://production-technology.org/mul...
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