Hydrodynamics in a stirred tank with a retreat blade impeller: Evaluating the potential of IBM-LES through comparison with PIV data

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design Pub Date : 2025-02-10 DOI:10.1016/j.cherd.2025.02.009

Seyed Salar Hoseini , Ali Hamieh , Carole Coufort-Saudejaud , Christine Frances , Alain Liné , Jérôme Morchain

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Abstract

This work presents numerical and experimental studies on the turbulent flow in a stirred tank reactor equipped with a two-finger baffle and a retreat blade impeller at Re = 43,200. Numerical results were obtained from Large Eddy Simulation (LES) combined with an Immersed Boundary Method (IBM) for the impeller and baffle representation. The experimental data consists in a set of PIV measurements in a vertical plane containing the shaft axis. The numerical results are compared with experimental data in terms of the flow field, mean velocity components, and kinetic energy. Proper Orthogonal Decomposition (POD) is applied to the IBM-LES results to extract the dominant modes and their time coefficients. The POD analysis suggests that the high energy level found in the upper part of the tank results from an energy transfer from the coherent structures created downstream the two-finger baffle. Finally, the trailing vortices behind the impeller blades and the baffle were detected and visualized using Jeong and Hussain's technique. The results show that IBM-LES is a reliable tool for studying the unsteady characteristics of turbulent flow in agitated tanks with complex geometry.

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来源期刊

Chemical Engineering Research & Design 工程技术-工程：化工

CiteScore

6.10

自引率

7.70%

发文量

623

审稿时长

42 days

期刊介绍： ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering. Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.