Imperial College London
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Professor Jan Cilliers

Faculty of Engineering, Department of Earth Science & Engineering

Chair in Mineral Processing
 
 
 
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Contact

 

+44 (0)20 7594 7360j.j.cilliers

 
 
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Location

 

RSM 1.46BRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wang:2019:10.1021/acs.langmuir.8b04112,
author = {Wang, P and Cilliers, JJ and Neethling, SJ and Brito-Parada, PR},
doi = {10.1021/acs.langmuir.8b04112},
journal = {Langmuir},
pages = {3680--3687},
title = {Effect of particle size on the rising behavior of particle-laden bubbles},
url = {http://dx.doi.org/10.1021/acs.langmuir.8b04112},
volume = {35},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The rising behavior of bubbles, initially half and fully coated with glass beads of various sizes, was investigated. The bubble velocity, aspect ratio, and oscillation periods were determined using high-speed photography and image analysis. In addition, the acting forces, drag modification factor, and modified drag coefficient were calculated and interpreted. Results show that the aspect ratio oscillation of the rising bubbles is similar, irrespective of the attached particle size. As the particle size is increased, the rising bubbles have a lower velocity and aspect ratio amplitude, with the time from release to each aspect ratio peak increasing. Higher particle coverage is shown to decrease the bubble velocity and dampen the oscillations, reducing the number of aspect ratio peaks observed. The highest rise velocities correspond to the lowest aspect ratios and vice versa, whereas a constant aspect ratio yields a constant rise velocity, independent of the particle size. Force analysis shows that the particle drag modification factor increases with the increased particle size and is greatest for fully laden bubbles. The modified drag coefficient of particle-laden bubbles increases with the increased particle size, although it decreases with the increased Reynolds number independent of the particle size. The drag force exerted by the particles plays a more dominant role in decreasing bubble velocities as the particle size increases. The results and interpretation produced a quantitative description of the behavior of rising particle-laden bubbles and the development of correlations will enhance the modeling of industrial applications.
AU  - Wang,P
AU  - Cilliers,JJ
AU  - Neethling,SJ
AU  - Brito-Parada,PR
DO  - 10.1021/acs.langmuir.8b04112
EP  - 3687
PY  - 2019///
SN  - 0743-7463
SP  - 3680
TI  - Effect of particle size on the rising behavior of particle-laden bubbles
T2  - Langmuir
UR  - http://dx.doi.org/10.1021/acs.langmuir.8b04112
UR  - https://www.ncbi.nlm.nih.gov/pubmed/30785756
UR  - http://hdl.handle.net/10044/1/69033
VL  - 35
ER  -
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