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Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes

The use of transverse cylinders of various sizes for generating vortex-induced waves in stratified oil–water pipe flows is investigated in this work. From CFD simulations in single phase flows, cylinders with 2 mm and 8 mm in diameter were selected which are found to generate vortices with frequenci...

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Main Authors: Zainal Abidin, Mohd Izzudin Izzat, Park, Kyeong Hyeon, Angeli, Panagiota
Format: Article
Published: Elsevier 2019
Subjects:
TP Chemical technology
Online Access:http://eprints.um.edu.my/22930/
https://doi.org/10.1016/j.euromechflu.2019.03.010
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spelling my.um.eprints.229302019-11-04T03:42:35Z http://eprints.um.edu.my/22930/ Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes Zainal Abidin, Mohd Izzudin Izzat Park, Kyeong Hyeon Angeli, Panagiota TP Chemical technology The use of transverse cylinders of various sizes for generating vortex-induced waves in stratified oil–water pipe flows is investigated in this work. From CFD simulations in single phase flows, cylinders with 2 mm and 8 mm in diameter were selected which are found to generate vortices with frequencies in the range of 1 to 100 Hz. The experimental work was conducted in a 8 m long acrylic test section with 37 mm internal diameter. High speed imaging was used to study the flow patterns and the interfacial wave characteristics while velocity fields and the characteristics of the vortices shed by the cylinders in the water phase were obtained with Particle Image Velocimetry. It was found that the vortex properties generated by different cylinder sizes are reflected on the interfacial wave characteristics. The frequencies of both the waves and the vortices agreed for all cases studied, while the wave amplitudes increased with increasing cylinder diameter. The Strouhal number for the 2 mm cylinder had the same value of 0.20 as in unbounded flows, while for the 8 mm cylinder and small distance from the wall, the Strouhal number was equal to 0.27. The presence of the transverse cylinders modified the two-phase flow pattern maps and reduced the transition from stratified to dispersed flows to lower mixture velocities compared to flows without cylinders. The transition boundaries were shifted further towards lower mixture velocity with increasing cylinder diameter. Elsevier 2019 Article PeerReviewed Zainal Abidin, Mohd Izzudin Izzat and Park, Kyeong Hyeon and Angeli, Panagiota (2019) Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes. European Journal of Mechanics - B/Fluids, 76. pp. 340-351. ISSN 0997-7546 https://doi.org/10.1016/j.euromechflu.2019.03.010 doi:10.1016/j.euromechflu.2019.03.010
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
Zainal Abidin, Mohd Izzudin Izzat
Park, Kyeong Hyeon
Angeli, Panagiota
Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
description The use of transverse cylinders of various sizes for generating vortex-induced waves in stratified oil–water pipe flows is investigated in this work. From CFD simulations in single phase flows, cylinders with 2 mm and 8 mm in diameter were selected which are found to generate vortices with frequencies in the range of 1 to 100 Hz. The experimental work was conducted in a 8 m long acrylic test section with 37 mm internal diameter. High speed imaging was used to study the flow patterns and the interfacial wave characteristics while velocity fields and the characteristics of the vortices shed by the cylinders in the water phase were obtained with Particle Image Velocimetry. It was found that the vortex properties generated by different cylinder sizes are reflected on the interfacial wave characteristics. The frequencies of both the waves and the vortices agreed for all cases studied, while the wave amplitudes increased with increasing cylinder diameter. The Strouhal number for the 2 mm cylinder had the same value of 0.20 as in unbounded flows, while for the 8 mm cylinder and small distance from the wall, the Strouhal number was equal to 0.27. The presence of the transverse cylinders modified the two-phase flow pattern maps and reduced the transition from stratified to dispersed flows to lower mixture velocities compared to flows without cylinders. The transition boundaries were shifted further towards lower mixture velocity with increasing cylinder diameter.
format Article
author Zainal Abidin, Mohd Izzudin Izzat
Park, Kyeong Hyeon
Angeli, Panagiota
author_facet Zainal Abidin, Mohd Izzudin Izzat
Park, Kyeong Hyeon
Angeli, Panagiota
author_sort Zainal Abidin, Mohd Izzudin Izzat
title Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
title_short Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
title_full Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
title_fullStr Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
title_full_unstemmed Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
title_sort vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes
publisher Elsevier
publishDate 2019
url http://eprints.um.edu.my/22930/
https://doi.org/10.1016/j.euromechflu.2019.03.010
_version_ 1651867377763090432
score 13.211869

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