Corrigendum to “Experimental and CFD investigation of power consumption in a dual Rushton turbine stirred tank” [Chem. Eng. Res. Des. 89 (2011) 280–290]

Taghavi, Mahsa; Zadghaffari, Ramin; Moghaddas, Jafarsadegh; Moghaddas, Yousef

doi:10.1016/j.cherd.2012.04.012

Cited by 4 publications

(5 citation statements)

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“…The mixing system was assumed to be isothermal, and the multiphase flow was modelled using the Eulerian–Eulerian approach, whose equations have been presented by Gimbun et al [ 24 ] , Taghavi et al [ 25 ] , and Guan et al [ 26 ] This multiphase framework treats both continuous and dispersed phases as interpenetrating continua, making it a practical approach for high gas flow rates. [ 27 ]…”

Section: Methodsmentioning

confidence: 99%

“…The mixing system was assumed to be isothermal, and the multiphase flow was modelled using the Eulerian-Eulerian approach, whose equations have been presented by Gimbun et al [24] , Taghavi et al [25] , and Guan et al [26] This multiphase framework treats both continuous and dispersed phases as interpenetrating continua, making it a practical approach for high gas flow rates. [27] The continuous phase was characterized as a Herschel-Bulkley fluid using the rheological parameters obtained experimentally, a density of 0.986 kg/L, and a surface tension of 0.0423 N/m.…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

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Effect of agitation and aeration on gas dispersion efficiency in coaxial mixers containing yield‐pseudoplastic fluids: Experimental and numerical analysis

Barros,

Ein‐Mozaffari,

Lohi

2023

Can J Chem Eng

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Aerated stirred vessels are commonly employed to enhance gas dispersion. However, the associated high energy consumption is a challenging feature, particularly when dealing with complex non‐Newtonian fluids. Coaxial mixers comprising a central impeller and a close‐clearance impeller have emerged as an energy‐efficient alternative that effectively intensifies gas dispersion. Hence, the objective of this study is to investigate the effect of aeration and agitation on the gas dispersion effectiveness of a coaxial mixer containing a yield‐pseudoplastic fluid. An anchor‐pitched blade turbine was employed to disperse air into a 1 wt.% xanthan gum solution, and the analysis primarily focused on characterizing the gas holdup and fluid flow behaviour. Gas holdup data were obtained experimentally using electrical resistance tomography (ERT), while computational fluid dynamics (CFD) simulations provided a detailed analysis of fluid flow patterns within the coaxial mixer. The rotational speed of the impeller exhibited a non‐monotonic effect on the gas holdup, and a significant influence of the interaction between variables was identified. For instance, the experimental data showed that the aeration effect varied with the anchor speed. Nevertheless, the variables' interaction effect was explained by the change in flow pattern observed numerically. Furthermore, the CFD results demonstrated that high gas holdup does not necessarily indicate intensified mixing. Therefore, combining experimental data and numerical simulations enables a more accurate characterization of mixing performance. These findings contribute to the understanding and improvement of mixing performance in such a complex system, which is crucial for designing efficient operations.

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Section: Methodsmentioning

confidence: 99%

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

Effect of agitation and aeration on gas dispersion efficiency in coaxial mixers containing yield‐pseudoplastic fluids: Experimental and numerical analysis

Barros,

Ein‐Mozaffari,

Lohi

2023

Can J Chem Eng

View full text Add to dashboard Cite

show abstract

“…[ 9 ] The simultaneous use of the planar laser‐induced fluorescence (PLIF) and particle image velocimetry (PIV) techniques has allowed understanding qualitatively and quantitatively, in a way not possible before, the mixing and homogenization processes in various systems other than ladles and under different processing conditions. [ 10–13 ] The interest of the application of these experimental techniques to obtain a deeper insight into mixing phenomena in steelmaking reactors shows that these techniques can be of the uttermost relevance from two points of view of practical application. On the one hand, the application of these tools opens the possibility of establishing, directly from experimental measurements of velocity and concentration fields in physical models, the determination of optimal design and operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Mass Transfer Mechanisms for Solute Mixing in a Gas‐Stirred Ladle Using the Particle Image Velocimetry and Planar Laser‐Induced Fluorescence Techniques

Jardón-Pérez

González‐Rivera

Trápaga

et al. 2021

steel research int.

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Particle image velocimetry (PIV) and planar laser‐induced fluorescence (PLIF) are synergically used to study from first principles the relative importance of the mass transport mechanisms governing the mixing of tracers in a physical model of a gas‐stirred ladle. A scaled 1/17th physical model of a 200 ton prototype is used to obtain flow patterns and turbulent kinetic energy maps by PIV, while PLIF provides instantaneous measured concentration fields on a complete plane. Results of both techniques allow computing the convection and the turbulent diffusion instantaneous mass transport fluxes from measured data to analyze comprehensively the ladle mixing. Two single injection modes, i.e., centric and eccentric midradius position, are analyzed and compared; eccentric injection is found to promote better mixing. Convective fluxes are bigger than turbulent diffusion fluxes in both injection modes during mixing. Both mechanisms act cooperatively to promote mixing and turbulent diffusion is key on mixing, although it has a smaller effect than convection. The single loop flow pattern and the bigger and better distributed turbulence result in mass transfer combined fluxes (convective plus turbulent diffusion) twice as optimal in the eccentric injection as in the centric injection, which explains why mixing is faster in eccentric than in centric mode.

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“…However, the published investigations are concerned primarily with large impeller clearance and spacing in a cylindrical tank, where there is little or no interaction between the flows produced by individual impeller, for example, in Jahoda et al or Bujalski et al And the patterns of the impeller are usually the Rushton turbine, dual Rushton impellers, or single pitched blade turbine . The detailed information of impeller configurations in the literature is shown in Tables .…”

Section: Introductionmentioning

confidence: 99%

PIV investigation of the flow features of double and single 45° up‐pumping pitched blade turbines in a square tank

Wang

et al. 2017

Can J Chem Eng

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The non‐conventionally square stirred tank with up‐pumping impellers has been recently adopted in wastewater treatment processes due to its simplicity and high efficiency. In this paper, the time‐averaged flow fields in the square tank with both double and single 45° up‐pumping pitched blade turbines (PBTs) are investigated using particle image velocimetry (PIV). Flow field generated by double impellers are directly compared with the flow fields by single impeller. The flow number (FI), anisotropy, total kinetic energy, and energy dissipation rate (ϵT*) are calculated to further investigate the flow features of the double impellers and single impeller. The results show that the high velocity region generated by a single impeller is about 0.4T (T is the length of square cross‐section of tank) in z direction. Flow number of the upper impeller is much larger than that of the lower impeller. In flow fields with a single impeller, the higher the impeller, the larger the flow number. The high flow anisotropy in terms of large scales occurs in the areas both above and beneath the impeller and near wall region. However, the high kinetic energy area corresponds to the high velocity region. Three numerical methods commonly used in the traditional cylindrical tank are employed to calculate ϵT*. The maximum ϵT* happens in areas near the impeller. Three methods give similar dissipation rate distributions but different values, which is the same as that in the cylindrical tank. It means that these methods could also be well used in square stirred tanks.

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Corrigendum to “Experimental and CFD investigation of power consumption in a dual Rushton turbine stirred tank” [Chem. Eng. Res. Des. 89 (2011) 280–290]

Cited by 4 publications

References 0 publications

Effect of agitation and aeration on gas dispersion efficiency in coaxial mixers containing yield‐pseudoplastic fluids: Experimental and numerical analysis

Effect of agitation and aeration on gas dispersion efficiency in coaxial mixers containing yield‐pseudoplastic fluids: Experimental and numerical analysis

Experimental Study of Mass Transfer Mechanisms for Solute Mixing in a Gas‐Stirred Ladle Using the Particle Image Velocimetry and Planar Laser‐Induced Fluorescence Techniques

PIV investigation of the flow features of double and single 45° up‐pumping pitched blade turbines in a square tank

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