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Home»Articles»Turbulence Characteristics in a Rushton Stirring Vessel: A Numerical Investigation

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Asian Journal of Science and Applied Technology (AJSAT)

Editor Dr. Balaji Ramachandran
Print ISSN : 2249 - 0698
Frequency : Half-yearly

Turbulence Characteristics in a Rushton Stirring Vessel: A Numerical Investigation

Author : Mohammad Amin Rashidifar and Ali Amin Rashidifar
Volume 2 No.2 July-December 2013 pp 25-42

Abstract

Understanding of the flow in stirred vessels can be useful for a wide number of industrial applications, like in mining, chemical and pharmaceutical processes. Remodeling and redesigning these processes may have a significant impact on the overall design characteristics, affecting directly product quality and maintenance costs. In most cases the flow around the rotating impeller blades interacting with stationary baffles can cause rapid changes of the flow characteristics, which lead to high levels of turbulence and higher shear rates. The flow is anisotropic and inhomogeneous over the entire volume. A better understanding and a detailed documentation of the turbulent flow field is needed in order to design stirred tanks that can meet the required operation conditions. This paper describes an effort for accurate estimation of the velocity distribution and the turbulent characteristics (vorticity, turbulent kinetic energy, dissipation rate) in a cylindrical vessel agitated by a Rushton turbine (a disk with six flat blades). Results from simulations using FLUENT (a commercial CFD package) are compared with Time Resolved Digital Particle Image Velocimetry (DPIV) for baseline configurations in order to validate and verify the fidelity of the computations. Different turbulent models are used in this study in order to determine which one is the most appropriate. Subsequently a parametric analysis of the flow characteristics as a function of the clearance height of the impeller from the vessel floor is performed. Results are presented along planes normal or parallel to the impeller axis, displaying velocity vector fields and contour plots of vorticity turbulent dissipation and others. Special attention is focused in the neighborhood of the impeller region and the radial jet generated there. The present results provide useful information for the design of the mixing process as well as for more accurate estimations in future work.

Keywords

Mixing; Stirring tank; Turbulence; DPIV; FLUENT; Rushton turbine

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References

AJSAT is covering all aspects of Science and Applied Technology areas. Topics include, but are not limited to:

Chemistry
Physics
Astronomy
Earth Science
Environmental Science
Biology
Computer Science
Mathematics
Statistics
Systems Science

Understanding of the flow in stirred vessels can be useful for a wide number of industrial applications, like in mining, chemical and pharmaceutical processes. Remodeling and redesigning these processes may have a significant impact on the overall design characteristics, affecting directly product quality and maintenance costs. In most cases the flow around the rotating impeller blades interacting with stationary baffles can cause rapid changes of the flow characteristics, which lead to high levels of turbulence and higher shear rates. The flow is anisotropic and inhomogeneous over the entire volume. A better understanding and a detailed documentation of the turbulent flow field is needed in order to design stirred tanks that can meet the required operation conditions. This paper describes an effort for accurate estimation of the velocity distribution and the turbulent characteristics (vorticity, turbulent kinetic energy, dissipation rate) in a cylindrical vessel agitated by a Rushton turbine (a disk with six flat blades). Results from simulations using FLUENT (a commercial CFD package) are compared with Time Resolved Digital Particle Image Velocimetry (DPIV) for baseline configurations in order to validate and verify the fidelity of the computations. Different turbulent models are used in this study in order to determine which one is the most appropriate. Subsequently a parametric analysis of the flow characteristics as a function of the clearance height of the impeller from the vessel floor is performed. Results are presented along planes normal or parallel to the impeller axis, displaying velocity vector fields and contour plots of vorticity turbulent dissipation and others. Special attention is focused in the neighborhood of the impeller region and the radial jet generated there. The present results provide useful information for the design of the mixing process as well as for more accurate estimations in future work.

Editor-in-Chief
Dr. Balaji Ramachandran
Department of Applied Sciences, Nicholls State University, Louisiana, United States
[email protected]
Editorial Advisory Board
Dr. Maamar Benkraouda
Department of Physics, United Arab Emirates University, UAE
[email protected]
Dr. Rasheed Al Hammadi
Department of Biology, United Arab Emirates University, UAE
[email protected]
Dr. Dimitrios P. Nikolelis
Department of Chemistry, University of Athens, Greece
[email protected]
Dr. Fauziah Binti Shahul Hamid
Institute of Biological Sciences, University of Malaya, Malaysia
[email protected]
Dr. Karni S Moshal
Department of Medicine, Alpert Medical School of Brown University, USA
[email protected]
Dr. Koh You Beng
Institute of Mathematical Sciences, University of Malaya, Malaysia
[email protected]
Dr. Lim Sok Li
Institute of Mathematical Sciences, University of Malaya, Malaysia
[email protected]
Dr. Ramesh Kasi
Department of Physics, University of Malaya, Malaysia
[email protected]
Dr. Jasmine Elanie Binti Khairat
Institute of Biological Sciences, University of Malaya, Malaysia
[email protected]
Dr. Nur Airina Binti Muhamad
Institute of Biological Sciences, University of Malaya, Malaysia
[email protected]
Dr. Amizah Malip
Department of Applied Mathematics, University of Malaya, Malaysia
[email protected]
Dr. Azzuliani Binti Supangat
Department of Physics, University of Malaya, Malaysia
[email protected]
Prof. Mohamed Toutounji
Professor, Department of Chemistry, United Arab Emirates University, UAE
[email protected]
Dr. Mohd Azmi Haron
Institute of Mathematical Sciences, University of Malaya, Malaysia
[email protected]
Prof. Noordini Mohamad Salleh
Department of Chemistry, University of Malaya, Malaysia
[email protected]
Dr. Ibrahim Bin Mohamed
Institute of Mathematical Sciences, University of Malaya, Malaysia
[email protected]
Dr. Halijah Ibrahim
Institute of Biological Sciences, University of Malaya, Malaysia
[email protected]
Dr. S. Chandra Kishore
Assistant Professor, University of Information Science and Technology,
“St. Paul The Apostle”, Macedonia, Greece
[email protected]
Dr. Salah Nasri
Department of Physics, United Arab Emirates University, UAE
[email protected]
Dr. Dharini Pathmanathan
Institute of Mathematical Sciences, University of Malaya, Malaysia
[email protected]

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    Editorial Note

    Editorial Dr. Balaji Ramachandran

    Editor-in-Chief
    Dr. Balaji Ramachandran
    Department of Applied Sciences, Nicholls State University, Louisiana, United States
    [email protected]
    Editorial Advisory Board
    Dr. Maamar Benkraouda
    Department of Physics, United Arab Emirates University, UAE
    [email protected]
    Dr. Rasheed Al Hammadi
    Department of Biology, United Arab Emirates University, UAE
    [email protected]
    Dr. Dimitrios P. Nikolelis
    Department of Chemistry, University of Athens, Greece
    [email protected]
    Dr. Fauziah Binti Shahul Hamid
    Institute of Biological Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. Karni S Moshal
    Department of Medicine, Alpert Medical School of Brown University, USA
    [email protected]
    Dr. Koh You Beng
    Institute of Mathematical Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. Lim Sok Li
    Institute of Mathematical Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. Ramesh Kasi
    Department of Physics, University of Malaya, Malaysia
    [email protected]
    Dr. Jasmine Elanie Binti Khairat
    Institute of Biological Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. Nur Airina Binti Muhamad
    Institute of Biological Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. Amizah Malip
    Department of Applied Mathematics, University of Malaya, Malaysia
    [email protected]
    Dr. Azzuliani Binti Supangat
    Department of Physics, University of Malaya, Malaysia
    [email protected]
    Prof. Mohamed Toutounji
    Professor, Department of Chemistry, United Arab Emirates University, UAE
    [email protected]
    Dr. Mohd Azmi Haron
    Institute of Mathematical Sciences, University of Malaya, Malaysia
    [email protected]
    Prof. Noordini Mohamad Salleh
    Department of Chemistry, University of Malaya, Malaysia
    [email protected]
    Dr. Ibrahim Bin Mohamed
    Institute of Mathematical Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. Halijah Ibrahim
    Institute of Biological Sciences, University of Malaya, Malaysia
    [email protected]
    Dr. S. Chandra Kishore
    Assistant Professor, University of Information Science and Technology,
    “St. Paul The Apostle”, Macedonia, Greece
    [email protected]
    Dr. Salah Nasri
    Department of Physics, United Arab Emirates University, UAE
    [email protected]
    Dr. Dharini Pathmanathan
    Institute of Mathematical Sciences, University of Malaya, Malaysia
    [email protected]

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