Imperial College London
Alternate

DrLyesKahouadji

Faculty of Engineering, Department of Chemical Engineering

Research Fellow in Computational Fluid Dynamics
 
 
 
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Contact

 

l.kahouadji Website CV

 
 
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Location

 

501bRoderic Hill BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Batchvarov:2020:10.1103/physrevfluids.5.093605,
author = {Batchvarov, A and Kahouadji, L and Magnini, M and Constante-Amores, CR and Shin, S and Chergui, J and Juric, D and Craster, RV and Matar, OK},
doi = {10.1103/physrevfluids.5.093605},
journal = {Physical Review Fluids},
pages = {093605  1--093605  21},
title = {Effect of surfactant on elongated bubbles in capillary tubes at high Reynolds number},
url = {http://dx.doi.org/10.1103/physrevfluids.5.093605},
volume = {5},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The effect of surfactants on the tail and film dynamics of elongated gas bubbles propagating through circular capillary tubes is investigated by means of an extensive three-dimensional numerical study using a hybrid front-tracking/level-set method. The focus is on the visco-inertial regime, which occurs when the Reynolds number of the flow is much larger than unity. Under these conditions, “clean” bubbles exhibit interface undulations in the proximity of the tail, with an amplitude that increases with the Reynolds number. We perform a systematic analysis of the impact of a wide range of surfactant properties, including elasticity, bulk surfactant concentration, solubility, and diffusivity, on the bubble and flow dynamics in the presence of inertial effects. The results show that the introduction of surfactants is effective in suppressing the tail undulations as they tend to accumulate near the bubble tail. Here large Marangoni stresses are generated, which lead to a local “rigidification” of the bubble. This effect becomes more pronounced for larger surfactant elasticities and adsorption depths. At reduced surfactant solubility, a thicker rigid film region forms at the bubble rear, where a Couette film flow is established, while undulations still appear at the trailing edge of the downstream “clean” film region. In such conditions, the bubble length becomes an influential parameter, with short bubbles becoming completely rigid.
AU  - Batchvarov,A
AU  - Kahouadji,L
AU  - Magnini,M
AU  - Constante-Amores,CR
AU  - Shin,S
AU  - Chergui,J
AU  - Juric,D
AU  - Craster,RV
AU  - Matar,OK
DO  - 10.1103/physrevfluids.5.093605
EP  - 1
PY  - 2020///
SN  - 2469-990X
SP  - 093605
TI  - Effect of surfactant on elongated bubbles in capillary tubes at high Reynolds number
T2  - Physical Review Fluids
UR  - http://dx.doi.org/10.1103/physrevfluids.5.093605
UR  - https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.5.093605
UR  - http://hdl.handle.net/10044/1/82972
VL  - 5
ER  -
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