Using positron emission particle tracking (PEPT) to study the turbulent flow in a baffled vessel agitated by a Rushton turbine: Improving data treatment and validation

Chiti, Fabio; Bakalis, Serafim; Bujalski, W.; Barigou, Mostafa; Eaglesham, Archie; Nienow, Alvin W.

doi:10.1016/j.cherd.2011.01.015

Cited by 48 publications

(30 citation statements)

References 19 publications

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“…However, it is very challenging to apply the PEPT to measure velocity fluctuation as the mass of water surrounding the tracer absorbs a portion of the γ-rays, decreasing the signal to noise ratio (Chiti, et al, 2011). Therefore, is not able to quantify turbulence.…”

Section: Particle Tracking Velocimetrymentioning

confidence: 99%

“…Excellent velocity measurement results were also obtained for solid suspensions with concentrations as high as 5wt%, which was not achievable using PIV. Chiti et al(2011) used PEPT to study the turbulent flow in a baffled vessel agitated by a Rushton turbine. The Lagrangian velocity obtained from the PEPT was converted to an Eulerian velocity that was then compared with LDA measurement results in the literature.…”

Section: Particle Tracking Velocimetrymentioning

confidence: 99%

“…: A schematic of a flotation cell with the various sub-processes Guida et al, 2009;PiankoOprych et al , 2009;Chiti et al,2011;Cole, et al, 2014 …”

mentioning

confidence: 99%

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Experimental quantification of turbulence and its applications in the study of multiphase flotation pulps

Xie¹,

Meng²,

Nguyen

2016

International Journal of Mineral Processing

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Turbulence is common in daily activities, both naturally and industrially. However, it is not well understood on the microscopic level because there is a lack of suitable quantification techniques especially for multi-phase particulate systems such as flotation pulps. In this paper, the different quantification techniques which have been used to characterise turbulence in the literature have been reviewed in terms of their basic principles, system structure, the range of application and limitations. Optical techniques such as Laser Doppler Anemometry and Particle Image Velocimetry can produce accurate measurement results with high spatial and temporal resolution, but their applications are limited to transparent flows. Hot wire probes have high spatial and temporal resolution in turbulence quantification, but they are susceptible to environmental factors. Conductivity probe, Electrical Resistance Tomography (ERT) and Piezoelectric Sensor are techniques that can quantify turbulence in multiphase flows, but their spatial resolutions are limited. Particle Tracking Velocimetry can reveal particle trajectories in multiphase flows; it can also measure velocity fluctuation. Positron Emission Particle Tracking cannot be used to quantify turbulence although it can also be used to determine the Lagrangian trajectory of particles. For turbulence quantification in three phase flows, piezoelectric sensor, ERT and conductivity probe require further development.

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Section: Particle Tracking Velocimetrymentioning

confidence: 99%

Section: Particle Tracking Velocimetrymentioning

confidence: 99%

See 1 more Smart Citation

Experimental quantification of turbulence and its applications in the study of multiphase flotation pulps

Xie¹,

Meng²,

Nguyen

2016

International Journal of Mineral Processing

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“…Cole et al (2010) determined the flow pattern of viscous non-Newtonian CMC solutions inside a vessel with PEPT, characterising the effectiveness with which they mixed. Chiti et al (2011) used PEPT to study the turbulent flow in a baffled vessel agitated by a Rushton turbine. The Lagrangian velocity obtained from the PEPT was converted to an Eulerian velocity that was then compared with LDA measurement results in the literature.…”

Section: Positron Emission Particle Tracking (Pept)mentioning

confidence: 99%

A review of turbulence measurement techniques for flotation

Meng

Tabosa

Xie

et al. 2016

Minerals Engineering

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“…Therefore, mixing time can be directly calculated from the velocity of the mixed fluid [12]. The velocity can be measured by various indirect techniques such as the Laser Doppler Anemometry (LDA) [13,14], Particle Image Velocimetry (PIV) [15,16], or the less common Positron Emission Particle Tracking (PEPT) [17,18]. Furthermore, it can also be calculated with a proper CFD simulator.…”

Section: Introductionmentioning

confidence: 99%

CFD Based Qualification of Mixing Efficiency of Stirred Vessels

Till

Molnár²,

Egedy

et al. 2018

Period. Polytech. Chem. Eng.

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In this work, we focus on the most crucial units in a chemical technology, the chemical reactors. Using a commercially available CFD software package, COMSOL Multiphysics, 3D mathematical models of a batch reactor with different impeller geometries have been investigated. The reasonable agreement between the experimental and simulation results indicates the validity of the developed CFD model. The effect of the impeller design, e. g. number of blades on the mixing efficiency is evaluated based on the simulation studies.The proposed measure to determine the energy efficiency of mixing (i. e. mixing index) is based on the calculated velocity field and energy usage. The information about the homogeneity of the mixed phase in the system can be extracted from the developed velocity field. Hence, we proposed histograms of velocity fluctuations on a logarithmic scale as an efficient tool to measure the achieved homogeneity of the phase in case of different impellers and rotational speeds. IntroductionDuring the last few decades, computational fluid dynamics (CFD) method has become a very powerful tool in the process industry primarily to analyse the hydrodynamic behavior. In general, CFD methods rely on the numerical solution of the Navier-Stokes equations, thus flow velocity, velocity magnitudes, and pressure values can be calculated in the geometric space investigated. A particularly significant benefit of the CFD simulators is that they can include entire apparatuses in three dimensions, regarding either single phase or multiphase systems [1,2]. This property of the CFD simulators makes them useful in a large number of research areas, including the study of mixing phenomena. Fluid mixing is a fundamental operation in the chemical process industry and the stirred tank or autoclave is a commonly used reactor type in many kinds of chemical technologies; therefore these systems are well described. Regardless, when it comes to design work, simple experimental correlations are still commonly used, e.g. Reynolds number, Froude number, power number or the Euler number which is derived from the previous ones. This approach has its limitations when it comes to the design of stirred vessels with complex internal structure.

show abstract

Using positron emission particle tracking (PEPT) to study the turbulent flow in a baffled vessel agitated by a Rushton turbine: Improving data treatment and validation

Cited by 48 publications

References 19 publications

Experimental quantification of turbulence and its applications in the study of multiphase flotation pulps

Experimental quantification of turbulence and its applications in the study of multiphase flotation pulps

A review of turbulence measurement techniques for flotation

CFD Based Qualification of Mixing Efficiency of Stirred Vessels

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