Macromixing study for various designs of impellers in a stirred vessel

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Macromixing study for various designs of impellers in a stirred vessel

Afshar Ghotli, R; Shafeeyan, MS; Abbasi, MR; Abdul Raman, AA; Ibrahim, S; (2020) Macromixing study for various designs of impellers in a stirred vessel. Chemical Engineering and Processing - Process Intensification , 148 , Article 107794. 10.1016/j.cep.2019.107794. Green open access

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Abstract

The effect of the impeller designs and impeller clearance level (C/T) on power consumption, mixing time and air entrainment point in a single liquid phase under turbulent conditions (Re > 104) were investigated. Different impeller designs including conventional and new designs, were used to consider both axial and radial flow impellers. The electric conductivity method, suspended motor system and observation method were employed to determine the mixing time, the power consumption and the air entrainment point, respectively. The reduction in the impeller clearance level form T/3 to T/6 resulted in a decrease in power number values for up-flow pumping impellers while it was increased for down-flow pumping. The same trend was observed for the mixing time results. Moreover, axial flow impellers and specially HE3 are preferable for higher agitation speeds due to the less air entrainment. The results verified that the axial flow impellers and specifically down-flow impellers are more efficient than the radial flow impellers. ANFIS-Fuzzy C–means (ANFIS–FcM) and nonlinear regression were used to develop models to predict the mixing time based on the energy dissipation rate and clearance. The results verified that the model predictions successfully fit the experimental mixing time data.

Type:	Article
Title:	Macromixing study for various designs of impellers in a stirred vessel
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1016/j.cep.2019.107794
Publisher version:	https://doi.org/10.1016/j.cep.2019.107794
Language:	English
Additional information:	This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords:	Impeller design, Clearance level; Energy dissipation rate; Mixing time; Nonlinear regression; ANFIS-Fuzzy C-means
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI:	https://discovery.ucl.ac.uk/id/eprint/10090196