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Fluid Mechanics and Transport Phenomena
Inception and termination of the core-annular flow pattern for oil-water downflow through a vertical pipe
Article first published online: 21 OCT 2011
DOI: 10.1002/aic.12741
Copyright © 2011 American Institute of Chemical Engineers (AIChE)
Additional Information
How to Cite
Ghosh, S., Das, G. and Das, P. K. (2012), Inception and termination of the core-annular flow pattern for oil-water downflow through a vertical pipe. AIChE J., 58: 2020–2029. doi: 10.1002/aic.12741
Publication History
- Issue published online: 7 JUN 2012
- Article first published online: 21 OCT 2011
- Accepted manuscript online: 25 JUL 2011 01:42PM EST
- Manuscript Revised: 5 JUL 2011
- Manuscript Received: 31 AUG 2010
- Abstract
- Article
- References
- Cited By
Keywords:
- multiphase-flow;
- oil–water downflow;
- transition criteria;
- flow regimes;
- core-;
- annular flow
Abstract
Different flow patterns for lube oil–water and for kerosene-water downflow through a vertical glass tube have been analyzed with the help of flow visualization. Core-annular flow is the dominant flow regime, with oil forming the core, and water is forming the wall film. When the velocities are increased, transition to slug flow and transition to dispersed flow are found. The waves found during the transition to slug flow depend on oil viscosity: axisymmetric bamboo waves are seen in kerosene-water downflow and the waves are asymmetric in case of lube oil–water flow where they have a cork-screw shape. Based on the experimental observations, simple mathematical models have been proposed for predicting the flow pattern transition curves. © 2011 American Institute of Chemical Engineers AIChE J, 2012