Comparison of PIV measurements and OpenFOAM simulations of a stirred tank: study of the azimuthal position effect

Koyro, Paula Trindade; Moura, Helder Lima de; Amaral, Ronaldo; Freitas, Lucas Freitas de Lima e; Barbutti, Aliandra Duarte; Nunhez, José Roberto; Castilho, Guilherme José de

doi:10.1007/s40430-022-03713-6

Cited by 6 publications

(4 citation statements)

References 70 publications

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“…The bibliographic review of computational simulation works equivalent to this study was also a determining factor for choosing the realizable k ‐ ε turbulence model, which showed excellent results with a relative reduction in computational cost and processing time, in addition to the simplicity of the model, which during construction of the geometric mesh allowed the use of a boundary layer containing a smaller number of elements. [ 14,17,18 ]…”

Section: Discussionmentioning

confidence: 99%

Experimental and computational investigation of coaxial contra‐rotating impellers design in baffled‐free stirred reactors

Berestinas,

Nunhez

2024

Can J Chem Eng

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Fluid mixing is a common topic in contemporary industry. The search for more efficient processes and reliable equipment is a constant challenge. In this work, numerical and experimental tests analyzed a 45° pitched blade turbine in a contra‐rotating coaxial impeller system (CRCIS) configuration mounted on baffles‐free reactors and compared it with conventional systems with one (CS1I) and two (CS2I) impellers mounted on tanks with baffles. Experimental tests were carried out using a pilot reactor with reduced scales of 1.0 m in diameter and 1.0 m in height (square batch). The behaviour of the physical variables was analyzed for mixing operations, solid particle suspension, and formation of vortices, and the power consumption was recorded through a torque transducer for different rotations. The acquired results helped in the validation of models and numerical simulations. The numerical simulation was carried out using the OpenFOAM® open‐source field operation and manipulation software. In addition, the velocity profile along with the height of the reactor, flow lines, pumping number, power consumption variations, and mixing time were compared. The conclusion of this study showed that CRCIS can be used in tanks without baffles. It also showed promising results for applications involving the suspension of solids, developing axial velocities at the bottom of the reactor higher than those of the CS1I and CS2I arrangements for the same rotation, with less energy consumption, proving to be a technically promising option for application on an industrial scale.

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Section: Discussionmentioning

confidence: 99%

Experimental and computational investigation of coaxial contra‐rotating impellers design in baffled‐free stirred reactors

Berestinas,

Nunhez

2024

Can J Chem Eng

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“…Numerical simulation based on computational fluid dynamics (CFD) and experimental measurement based on flow visualization techniques, such as particle image velocimetry (PIV), are widely used to investigate the flow characteristics in a stirred tank. Many researchers have used PIV to validate CFD simulation results and to study the flow characteristic of the stirred tank. − …”

Section: Introductionmentioning

confidence: 99%

CFD-PBM Investigation on Droplet Size Distribution in a Liquid–Liquid Stirred Tank: Effect of Impeller Type

Tan

Qian

Jiang

et al. 2023

Ind. Eng. Chem. Res.

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The influence of impeller type on the liquid−liquid dispersion system was investigated by computational fluid dynamics coupled with the population balance model (PBM). Rushton turbine (RT), pitched-blade turbine (PBT), and parabolic blade turbine (PB) produce different flow fields and turbulence distribution. The droplet size distribution (DSD), breakage frequency, and coalescence rate were predicted with the Alopaeus breakage model and the CT coalescence model. The simulated velocity field and DSD were validated with particle image velocimetry and image analysis, respectively. The analysis of the interaction between eddy and droplet shows that the turbulent inertial regime was the dominant mechanism of droplet breakage in the impeller region for radial-type impellers (RT and PB), while the turbulent viscous regime for an axial impeller (PBT). RT and PB can produce smaller droplets than PBT, about 16.4 and 10.7%, respectively. The average turbulent dissipation rates of RT and PB are about 7 and 10 times that of PBT in the impeller region, which explains the better performance of these two radial impellers in terms of droplet breakup.

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Section: Introductionmentioning

confidence: 99%

“…Image-based methods including invasive and noninvasive techniques can intuitively visualize and objectively reflect the hydrodynamics of reactors. The most used noninvasive measuring technique like particle image velocimetry (PIV) , relies on capturing images from outside a reactor with transparent walls and liquids, so it is mainly used in single or dilute two-phase systems. , In addition, the invasive methods, such as the telecentric vision probe (TVP), are capable of capturing local information at various spatial locations and adapting to highly dispersed phase conditions, although they may slightly interfere with flow fields. The telecentric vision probe for multiphase system measurement was developed by Wang et al, and it was used to probe the BSD and the local gas holdup in both the gas–liquid stirred tank under typical industrial gassing rates (i.e., 0.5–1.0 vvm) and the bubble column with irregular large bubbles .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Gas–Liquid–Solid Stirred Tank by Using the Intrusive Image-Based Method

Wang,

Duan,

Feng

et al. 2023

Ind. Eng. Chem. Res.

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This work investigates the effect of solid particles on bubble size distribution and dispersed phase holdup in a stirred tank with the invasive telecentric photographic measurement system. The bubbles and solid particles are efficiently identified and distinguished with the image processing mainly based on deep learning and two different magnifications of telecentric lenses. The results show that solid particles promote the coalescence of bubbles, particularly at high solid concentrations. However, small bubbles (<1 mm) still dominate in number density, but their volume proportions are less than 3%. The Sauter mean diameter of bubbles (d 32 ) does not always increase monotonously with the increase in solid concentration. For small particles, the increment in d 32 is more pronounced due to a better solid suspension and a higher local effective viscosity, which further results in a lower local gas holdup. To summarize, the developed measurement method for the gas−liquid−solid system in this work provides valuable insights into the hydrodynamics in a stirred tank.

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Comparison of PIV measurements and OpenFOAM simulations of a stirred tank: study of the azimuthal position effect

Cited by 6 publications

References 70 publications

Experimental and computational investigation of coaxial contra‐rotating impellers design in baffled‐free stirred reactors

Experimental and computational investigation of coaxial contra‐rotating impellers design in baffled‐free stirred reactors

CFD-PBM Investigation on Droplet Size Distribution in a Liquid–Liquid Stirred Tank: Effect of Impeller Type

Investigation of the Gas–Liquid–Solid Stirred Tank by Using the Intrusive Image-Based Method

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