Edomwonyi-Otu, LC;
Angeli, P;
(2015)
Pressure drop and holdup predictions in horizontal oil-water flows for curved and wavy interfaces.
CHEMICAL ENGINEERING RESEARCH & DESIGN
, 93
55 - 65.
10.1016/j.cherd.2014.06.009.
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Abstract
In this work a modified two-fluid model was developed based on experimental observations of the interface configuration in stratified liquid–liquid flows. The experimental data were obtained in a horizontal 14 mmID acrylic pipe, for test oil and water superficial velocities ranging from 0.02 m/s to 0.51 m/s and from 0.05 m/s to 0.62 m/s, respectively. Using conductance probes, average interface heights were obtained at the pipe centre and close to the pipe wall, which revealed a concave interface shape in all cases studied. A correlation between the two heights was developed that was used in the two-fluid model. In addition, from the time series of the probe signal at the pipe centre, the average wave amplitude was calculated to be 0.0005 m and was used as an equivalent roughness in the interfacial shear stress model. Both the interface shape and roughness were considered in the two-fluid model together with literature interfacial shear stress correlations. Results showed that the inclusion of both the interface curvature and the equivalent roughness in the two-fluid model improved its predictions of pressure drop and interface height over the range of studied superficial oil and water velocities. Compared to the two-fluid model with other interfacial shear stress correlations, the modified model performed better particularly for predicting pressure drop.
| Type: | Article |
|---|---|
| Title: | Pressure drop and holdup predictions in horizontal oil-water flows for curved and wavy interfaces |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.cherd.2014.06.009 |
| Publisher version: | http://dx.doi.org/10.1016/j.cherd.2014.06.009 |
| Language: | English |
| Additional information: | © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). |
| Keywords: | Liquid-liquid flow, Curved interface, Interfacial waves, Interfacial roughness, Two-fluid model, Conductivity probes |
| 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/1443007 |
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