Using electrical resistance tomography and computational fluid dynamics modeling to study the formation of cavern in the mixing of pseudoplastic fluids possessing yield stress

Pakzad, Leila; Ein‐Mozaffari, Farhad; Chan, Philip K.

doi:10.1016/j.ces.2008.02.009

Cited by 137 publications

(115 citation statements)

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“…Impellers with a semicircular blade shape are now common in the industry, e.g. the Chemineer CD-6 (BAKKER et al, 1994) and the Scaba 6SRGT impeller (PAKZAD et al, 2008). Warmoeskerken and Smith (1989) reported that the gas-liquid mass transfer in an agitated tank due to a semi-circular blade impeller is at least 20% higher than that of a standard Rushton impeller at high power dissipation levels.…”

Section: Effect Of the Curvature Bladementioning

confidence: 99%

“…Pakzad et al (2007) have investigated the flow pattern generated by a Scaba impeller for mixing yield stress fluid. Pakzad et al (2008) have used the electrical resistance tomography (ERT) technique to examine, in three dimensions, the homogeneity and flow pattern inside the mixing tank. They have studied the shape and the size of cavern generated around a radial-flow Scaba 6SRGT impeller in the Bakker et al (2010) have developed a semi-empirical model to calculate the height of caverns forming in non-Newtonian mineral slurries in a mechanical flotation cell.…”

Section: Introductionmentioning

confidence: 99%

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<b>Numerical investigation of flow induced by a disc turbine in unbaffled stirred tank</b> - doi: 10.4025/actascitechnol.v35i3.15554

Ameur

Bouzit

2013

Acta Sci. Technol.

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ABSTRACT. The flow generated by a disc turbine in a cylindrical unbaffled tank was numerically modeled. This study was carried out for shear-thinning fluids. Analyses concern the effect of impeller rotational speed, fluid rheology and impeller blade curvature on the mean velocities and power consumption. It was found that the cavern size and the power consumption are higher for extreme shear thinning fluids. It was found also that the best performance is achieved at high Reynolds number and flat-blade turbine. Predictions have been compared with literature data and a satisfactory agreement has been found.Keywords: numerical study, stirred tank, shear thinning fluid, disc turbine, impeller location, blade curvature.Investigação numérica do fluxo induzido por uma turbina de disco em 'unbaffled' tanque de agitação RESUMO. O fluxo gerado por uma turbina de disco em um tanque cilíndrico unbaffled foi numericamente modelada. Este estudo foi realizado para corte fino fluidos. As análises dizem respeito ao efeito da velocidade de rotação do rotor, reologia de fluidos e curvatura da lâmina do rotor na velocidade média e consumo de energia. Verificou-se que o tamanho da caverna eo consumo de energia são maiores para diluir os fluidos de corte extremas. Verificou-se também que o melhor desempenho é alcançado em número de Reynolds alto e flat-blade turbina. Previsões foram comparados com dados da literatura e um acordo satisfatório foi encontrado.Palavras-chave: estudo numérico, tanque de agitação, fluido pseudoplástico, disco turbina, localização do rotor, a curvatura da lâmina.

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Section: Effect Of the Curvature Bladementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

<b>Numerical investigation of flow induced by a disc turbine in unbaffled stirred tank</b> - doi: 10.4025/actascitechnol.v35i3.15554

Ameur

Bouzit

2013

Acta Sci. Technol.

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“…The Herschel-Bulkley model causes numerical instability when the non-Newtonian viscosity blows up at small shear rates (Ford et al, 2006;Pakzad et al, 2008a;. This problem is surmounted by the modified Herschel-Bulkley model given by > (Ford et al, 2006;Pakzad et al, 2008a;.…”

Section: The Rheological Modelmentioning

confidence: 99%

“…This problem is surmounted by the modified Herschel-Bulkley model given by > (Ford et al, 2006;Pakzad et al, 2008a;.…”

Section: The Rheological Modelmentioning

confidence: 99%

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

Ein‐Mozaffari¹,

Upreti²

2010

Computational Fluid Dynamics

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“…When mixing materials are opaque, the process cannot be monitored directly via eye visualization. EIT is, therefore, proposed as a suitable technique that can offer real-time mixing examination as well as flow distribution monitoring [16][17][18][19][20]. EIT techniques have been implemented in many companies, such as GlaxoSmithKline (GSK, UK) [21], Johnson Matthey (UK) [22,23] and Unilever (UK) [17].…”

Section: (Ii) Mixingmentioning

confidence: 99%

Super-sensing technology: industrial applications and future challenges of electrical tomography

Wei

Qiu

Primrose

2016

Phil. Trans. R. Soc. A.

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One contribution of 10 to a theme issue 'Super-sensing through industrial process tomography' . Electrical tomography is a relatively new imaging technique that can image the distribution of the passive electrical properties of an object. Since electrical tomography technology was proposed in the 1980s, the technique has evolved rapidly because of its low cost, easy scale-up and non-invasive features. The technique itself can be sensitive to all passive electrical properties, such as conductivity, permittivity and permeability. Hence, it has a huge potential to be applied in many applications. Owing to its illposed nature and low image resolution, electrical tomography attracts more attention in industrial fields than biomedical fields. In the past decades, there have been many research developments and industrial implementations of electrical tomography; nevertheless, the awareness of this technology in industrial sectors is still one of the biggest limitations for technology implementation. In this paper, the authors have summarized several representative applications that use electrical tomography. Some of the current tomography research activities will also be discussed.This article is part of the themed issue 'Supersensing through industrial process tomography'.

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Using electrical resistance tomography and computational fluid dynamics modeling to study the formation of cavern in the mixing of pseudoplastic fluids possessing yield stress

Cited by 137 publications

References 41 publications

<b>Numerical investigation of flow induced by a disc turbine in unbaffled stirred tank</b> - doi: 10.4025/actascitechnol.v35i3.15554

<b>Numerical investigation of flow induced by a disc turbine in unbaffled stirred tank</b> - doi: 10.4025/actascitechnol.v35i3.15554

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

Super-sensing technology: industrial applications and future challenges of electrical tomography

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