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ChemEngineering 2018, 2(2), 26; https://doi.org/10.3390/chemengineering2020026

Performance of Helical Ribbon and Screw Impellers for Mixing Viscous Fluids in Cylindrical Reactors

1
Institute of Science and Technology, University Center Ahmed Salhi of Naâma (Ctr Univ Naâma), P.O. 66, Naâma 45000, Algeria
2
Faculty of Technology, University Hassiba Ben Bouali, Chlef 02000, Algeria
3
Department of Technical Sciences, University Amar Thilidji, Laghouat 03000, Algeria
*
Author to whom correspondence should be addressed.
Received: 21 March 2018 / Revised: 9 May 2018 / Accepted: 3 June 2018 / Published: 11 June 2018
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Abstract

The present paper deals with the mixing of a highly viscous fluid by close-clearance impellers in cylindrical vessels. The study is performed via numerical simulations. Calculations are achieved by the discretization of continuity and momentum equations with the finite volume method. The effect of blade diameter and its shape on the well-stirred region size and the power consumption is investigated. For highly viscous fluids, the obtained results suggest the use of impellers rotating at low Reynolds number, and having a blade with the same shape of the tank to ensure mixing near the vessel base. A comparison is made between the performance of a simple helical ribbon (HR), a simple small screw (SS), helical ribbon-small screw (HR-SS) and a large screw (LS) impeller. The predicted results allow the following classification of impellers studied, based on less power requirements and small size of well-agitated region: SS < HR < HR-SS < LS. View Full-Text
Keywords: mixing; viscous fluids; cylindrical tank; close-clearance impeller; helical-screw impeller mixing; viscous fluids; cylindrical tank; close-clearance impeller; helical-screw impeller
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Ameur, H.; Kamla, Y.; Sahel, D. Performance of Helical Ribbon and Screw Impellers for Mixing Viscous Fluids in Cylindrical Reactors. ChemEngineering 2018, 2, 26.

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