Author Identifier
Maryam Amiraftab
https://orcid.org/0000-0003-0611-2890
Mehdi Khiadani
https://orcid.org/0000-0003-1703-9342
Hussein A. Mohammed
Document Type
Journal Article
Publication Title
Chemical Engineering and Processing - Process Intensification
Publisher
Elsevier
School
School of Engineering
RAS ID
30700
Funders
Edith Cowan University - Open Access Support Scheme 2020
Abstract
The performance of a dual helical ribbon impeller in a gassed stirred tank reactor filled with a shear-thinning polymer has been investigated experimentally in this study. Sodium carboxymethyl cellulose with different concentrations were applied to change the viscosity and rheological behaviour of working fluid. Titration reaction between HCl and NaOH then took place inside the reactor under controlled pH, evaluating the influence of a dual helical ribbon impeller on the performance of a two-phase agitated reactor. The impact of impeller rotational speed, gas flow rate, viscosity, and clearance to the bottom on power uptake and mixing time are explored. The results thus reveal that the presence of bubbles reduces both required power uptake and mixing time to reach an endpoint reaction. Contrary to expectations, this study indicates that increasing the impeller's speed beyond a certain level, not only fails to further reduction in mixing time, whilst the power uptake increases exponentially. Furthermore, for the first time, this study suggest that power number is inversely proportional to the square root of Reynolds number when systems are equipped with a dual helical ribbon impeller. The response surface method and quadratic numerical models are applied to suggest models in order to calculate the mixing time and power consumption.
DOI
10.1016/j.cep.2020.107811
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Amiraftabi, M., Khiadani, M., & Mohammed, H. A. (2020). Performance of a dual helical ribbon impeller in a two-phase (gas-liquid) Stirred Tank Reactor. Chemical Engineering and Processing: Process Intensification, 148, Article 107811.
https://doi.org/10.1016/j.cep.2020.107811