Study of gas–liquid mixing in stirred vessel using electrical resistance tomography

F. Sher, Z. Sajid, B. Tokay, Martin Khzouz, H. Sadiq

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This study presents a full operation and optimization of a mixing unit; an innovative approach is developed to address the behaviour of gas–liquid mixing by using electrical resistance tomography. The validity of the method is investigated by developing the tomographic images using different numbers of baffles in a mixing unit. This technique provided clear visual evidence of better mixing that took place inside the gas−liquid system and the effect of a different number of baffles on mixing characteristics. For optimum gas flow rate (m3/s) and power input (kW), the oxygen absorption rate in water was measured. Dynamic gassing-out method was applied for five different gas flow rates and four different power inputs to find out mass transfer coefficient (KLa). The rest of the experiments with one up to four baffles were carried out at these optimum values of power input (2.0 kW) and gas flow rate (8.5 × 10−4 m3/s). The experimental results and tomography visualizations showed that the gas−liquid mixing with standard baffling provided near the optimal process performance and good mechanical stability, as higher mass transfer rates were obtained using a greater number of baffles. The addition of single baffle had a striking effect on mixing efficiency, and additions of further baffles significantly decrease mixing time. The energy required for complete mixing was remarkably reduced in the case of four baffles as compared with without any baffle. The process economics study showed that the increased cost of baffle installation accounts for less cost of energy input for agitation. The process economics have also revealed that the optimum numbers of baffles are four in the present mixing unit, and the use of an optimum number of baffles reduced the energy input cost by 54%.
Original languageEnglish
Pages (from-to)855-865
Number of pages11
JournalAsia-Pacific Journal of Chemical Engineering
Issue number6
Early online date22 Jun 2016
Publication statusPublished - Dec 2016

Bibliographical note

This is the peer reviewed version of the following article: Sher, F, Sajid, Z, Tokay, B, Khzouz, M & Sadiq, H 2016, 'Study of gas–liquid mixing in stirred vessel using electrical resistance tomography' Asia-Pacific Journal of Chemical Engineering, vol. 11, no. 6, pp. 855-865.which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.


  • gas−liquid mixing
  • hydrodynamics
  • mass transfer
  • tomography
  • stirred vessel
  • baffles
  • process economics


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