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Transition from stratified to non-stratified oil-water flows using a bluff body

Park, KH; Chinaud, M; Angeli, P; (2016) Transition from stratified to non-stratified oil-water flows using a bluff body. Experimental Thermal and Fluid Science , 76 pp. 175-184. 10.1016/j.expthermflusci.2016.03.017. Green open access

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Abstract

In this paper the effect of a transverse cylindrical rod immersed in water on the flow patterns and interfacial characteristics of an oil-water pipe flow is investigated experimentally. The cylinder is used to passively actuate the transition from stratified to non-stratified flows and to localise the formation of waves and the detachment of drops. The studies are carried out in an acrylic test section with 37 mm ID using as test fluids tap water and Exxsol D140 (density 830 kg m-3 and viscosity 5.5 cP). The rod has 5 mm diameter and is located at 460 mm from the test section inlet. Flow patterns and interface characteristics were studied with high speed imaging. It was found that the presence of the rod generates waves shortly downstream, from which drops detach, and reduces the mixture velocity for the transition from stratified to non-stratified flows. The average interface height and wave amplitude increase with distance from the rod, while the average wave length and frequency remain almost constant. The Strouhal number is found to be equal to 0.24, while the wave velocities are slightly higher than the mixture velocities.

Type: Article
Title: Transition from stratified to non-stratified oil-water flows using a bluff body
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.expthermflusci.2016.03.017
Publisher version: http://dx.doi.org/10.1016/j.expthermflusci.2016.03...
Language: English
Additional information: © 2016 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
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/1482464
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