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Flow pattern transition in liquid-liquid flows with a transverse cylinder

Chinaud, M; Park, KH; Angeli, P; (2016) Flow pattern transition in liquid-liquid flows with a transverse cylinder. International Journal of Multiphase Flow , 90 pp. 1-12. 10.1016/j.ijmultiphaseflow.2016.11.011. Green open access

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Abstract

The effect of a cylindrical bluff body on the interface characteristics of stratified two-phase, oil-water, pipe flows is experimentally investigated with high speed Particle Image Velocimetry (PIV). The motivation was to study the feasibility of flow pattern map actuation by using a transverse cylinder immersed in water in the stratified pattern, and particularly the transition from separated to dispersed flows. The cylinder has a diameter of 5 mm and is located at 6.75 mm from the pipe top in a 37 mm ID acrylic test section. Velocity profiles were obtained in the middle plane of the pipe. For reference, single phase flows were also investigated for Reynolds numbers from 1550 to 3488. It was found that the flow behind the cylinder was similar to the two dimensional cases, while the presence of the lower pipe wall diverted the vorticity layers towards the top. In two-phase flows, the Froude number (from 1.4 to 1.8) and the depth of the cylinder submergence below the interface affected the generation of waves. For high Froude numbers and low depths of submergence the counter rotating von Karman vortices generated by the cylinder interacted with the interface. In this case, the vorticity clusters from the top of the cylinder were seen to attach at the wave crests. At high depths of submergence, a jet like flow appeared between the top of the cylinder and the interface. High speed imaging revealed that the presence of the cylinder reduced to lower mixture velocities the transition from separated to dual continuous flows where drops of one phase appear into the other.

Type: Article
Title: Flow pattern transition in liquid-liquid flows with a transverse cylinder
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijmultiphaseflow.2016.11.011
Publisher version: http://dx.doi.org/10.1016/j.ijmultiphaseflow.2016....
Language: English
Additional information: Copyright © The Authors 2016. This is an Open Access article published under the Creative Commons Attribution 4.0 International licence (https://creativecommons.org/licenses/by/4.0/).
Keywords: Oil-water flow; Bluff body; Stratified flow; Dispersed flow; PIV measurements; Flow pattern map actuation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1531154
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