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A numerical study of single air bubble formation comparison between in viscous liquid and in water

The performance of bubble column reactors is dependent on bubble size that is formed through a sparger. Here, a single air bubble formation (BF) using an orifice in the viscous liquid is modeled by using the volume of fluid method. The interface between the air and the liquid phase is calculated by...

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Main Authors: Islam, Md Tariqul, Ganesan, Poo Balan, Billah, Md Masum, Uddin, Md Nasir
Format: Article
Published: Wiley 2019
Subjects:
TJ Mechanical engineering and machinery
TP Chemical technology
Online Access:http://eprints.um.edu.my/24086/
https://doi.org/10.1002/apj.2367
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spelling my.um.eprints.240862020-03-22T10:51:46Z http://eprints.um.edu.my/24086/ A numerical study of single air bubble formation comparison between in viscous liquid and in water Islam, Md Tariqul Ganesan, Poo Balan Billah, Md Masum Uddin, Md Nasir TJ Mechanical engineering and machinery TP Chemical technology The performance of bubble column reactors is dependent on bubble size that is formed through a sparger. Here, a single air bubble formation (BF) using an orifice in the viscous liquid is modeled by using the volume of fluid method. The interface between the air and the liquid phase is calculated by using the continuum surface force equation. Detailed characteristics of BF such as the instantaneous contact angle, bubble departure volume, bond number due to orifice size and surface tension, and capillary number are examined for different orifice sizes at constant air flow rate boundary condition. The numerical results are validated with available correlation and experimental data for orifice bond number reported in the literature. A comparison of BF characteristics between in the viscous liquid and in the water is examined. The instantaneous contact angle decreases steeply for the orifice with small size than a large orifice. The bubble volume increases with increasing contact angle and decreasing the orifice bond number. In comparison with water, a decreasing detachment time and dome width of bubble and an increasing bubble neck elongation are found in viscous liquid and decrease with increasing bond number. Moreover, there is a minimum capillary number, where the bubble neck elongation height and breakup processes are relatively fast. This study can helpful in designing a coarse gas sparger to develop pseudo-homogeneous bubbly flow regime at lower superficial gas velocity conditions. © 2019 Curtin University and John Wiley & Sons, Ltd. Wiley 2019 Article PeerReviewed Islam, Md Tariqul and Ganesan, Poo Balan and Billah, Md Masum and Uddin, Md Nasir (2019) A numerical study of single air bubble formation comparison between in viscous liquid and in water. Asia-Pacific Journal of Chemical Engineering, 14 (6). e2367. ISSN 1932-2135 https://doi.org/10.1002/apj.2367 doi:10.1002/apj.2367
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 TJ Mechanical engineering and machinery
TP Chemical technology
spellingShingle TJ Mechanical engineering and machinery
TP Chemical technology
Islam, Md Tariqul
Ganesan, Poo Balan
Billah, Md Masum
Uddin, Md Nasir
A numerical study of single air bubble formation comparison between in viscous liquid and in water
description The performance of bubble column reactors is dependent on bubble size that is formed through a sparger. Here, a single air bubble formation (BF) using an orifice in the viscous liquid is modeled by using the volume of fluid method. The interface between the air and the liquid phase is calculated by using the continuum surface force equation. Detailed characteristics of BF such as the instantaneous contact angle, bubble departure volume, bond number due to orifice size and surface tension, and capillary number are examined for different orifice sizes at constant air flow rate boundary condition. The numerical results are validated with available correlation and experimental data for orifice bond number reported in the literature. A comparison of BF characteristics between in the viscous liquid and in the water is examined. The instantaneous contact angle decreases steeply for the orifice with small size than a large orifice. The bubble volume increases with increasing contact angle and decreasing the orifice bond number. In comparison with water, a decreasing detachment time and dome width of bubble and an increasing bubble neck elongation are found in viscous liquid and decrease with increasing bond number. Moreover, there is a minimum capillary number, where the bubble neck elongation height and breakup processes are relatively fast. This study can helpful in designing a coarse gas sparger to develop pseudo-homogeneous bubbly flow regime at lower superficial gas velocity conditions. © 2019 Curtin University and John Wiley & Sons, Ltd.
format Article
author Islam, Md Tariqul
Ganesan, Poo Balan
Billah, Md Masum
Uddin, Md Nasir
author_facet Islam, Md Tariqul
Ganesan, Poo Balan
Billah, Md Masum
Uddin, Md Nasir
author_sort Islam, Md Tariqul
title A numerical study of single air bubble formation comparison between in viscous liquid and in water
title_short A numerical study of single air bubble formation comparison between in viscous liquid and in water
title_full A numerical study of single air bubble formation comparison between in viscous liquid and in water
title_fullStr A numerical study of single air bubble formation comparison between in viscous liquid and in water
title_full_unstemmed A numerical study of single air bubble formation comparison between in viscous liquid and in water
title_sort numerical study of single air bubble formation comparison between in viscous liquid and in water
publisher Wiley
publishDate 2019
url http://eprints.um.edu.my/24086/
https://doi.org/10.1002/apj.2367
_version_ 1662755221028208640
score 13.211869

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