Flow characteristics of Newtonian and non-Newtonian fluids in a vessel stirred by a 60° pitched blade impeller

Nouri, J. M.; Hockey, Randal

doi:10.1260/175095408784300261

Cited by 6 publications

(1 citation statement)

References 26 publications

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“…The main aims of Aubin et al [8] were to characterize the single phase turbulent flow in a tank stirred by a 45° pitched blade impeller using CFD. Nouri and Hockey [9] presented the mean and rms velocity characteristics of the Newtonian and non-Newtonian flow in a mixing vessel stirred by a 60° pitched blade impeller, measured by LDV. Venneker et al [10] examined the impact of the Reynolds number and the flow index for the turbulent flow and non-Newtonian fluid, experimentally and using LDV.…”

Section: Introductionmentioning

confidence: 99%

An Investigation into Different Power Consumption Parameters of Rushton Turbines: A Computational Survey

Ashory

Talebi

Ghadikolaei

et al. 2018

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SummaryIn the present work, the mixing process of shear thinning liquids in a six-blade Rushton turbine is studied. A finite volume based computational fluid dynamics (CFD) simulation has been carried out and the three-dimensional turbulent flow is numerically analyzed by using the Shear Stress Transport k-ω (k-ω SST) model. Shear thinning liquids were investigated and shear thinning behaviour was modelled by the Ostwald-de Waele law. The used stirred vessel has a cylindrical shape with a flat bottom and the liquid height was kept equal to the vessel diameter. Effects of the power law index and the angle of attack of the blade on power consumption have been investigated. The results show that decreasing the angle of attack from 90° to 45° not only results in an increase in the flow rate down to the bottom of the vessel, resulting in a better mixture qualification, but also reduces the power consumption of the stirring process. To verify the simulation, axial, radial and tangential velocity components were compared with other experimental data and satisfactory agreement was found.

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Section: Introductionmentioning

confidence: 99%

An Investigation into Different Power Consumption Parameters of Rushton Turbines: A Computational Survey

Ashory

Talebi

Ghadikolaei

et al. 2018

TFAMENA

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Modeling of cavern formation in yield stress fluids in stirred tanks

et al. 2014

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Prediction of cavern formation in yield stress fluids in stirred tanks is of great importance for optimization. A new torus model is developed and then validated by experimental data and computational fluid dynamics simulation. Unlike existing mathematical models, the new torus model assumes that the circular center of the torus should not be outside the impeller swept region as the Reynolds number (Re) increases. Hence the cavern boundary is shaped like an apple torus rather than a horn torus. The new model also considers the cavern‐vessel interactions. At relatively high Re, the new model predicts cavern shape and size better than other models. It correctly captures the cavern outline at various Re, which verified the assumption about torus center. The new model is then used to identify the influence of rheological parameters on cavern formation, and further extended to the cavern prediction of the dual‐impeller system. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3057–3070, 2014

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Energy Dissipation Rates of Newtonian and Non‐Newtonian Fluids in a Stirred Vessel

2014

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Energy dissipation rates of water and glycerol as Newtonian fluids and carboxyl methyl carbonate solution as non-Newtonian fluid in a stirred vessel are investigated by 2D particle image velocimetry and compared. Mean velocity profiles reflect the Reynolds (Re) number similarity of two flow fields with different rheological properties, but the root mean square velocity profiles differ in rheology at the same Re-number. Energy dissipation rates are estimated by direct calculation of fluctuating velocity gradients. The varying energy dissipation rates of Newtonian and non-Newtonian fluids result from the difference in fluid rheology and apparent viscosity distribution which decides largely the flow pattern, circulation intensity, and rate of turbulence generation.

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Flow characteristics of Newtonian and non-Newtonian fluids in a vessel stirred by a 60° pitched blade impeller

Cited by 6 publications

References 26 publications

An Investigation into Different Power Consumption Parameters of Rushton Turbines: A Computational Survey

An Investigation into Different Power Consumption Parameters of Rushton Turbines: A Computational Survey

Modeling of cavern formation in yield stress fluids in stirred tanks

Energy Dissipation Rates of Newtonian and Non‐Newtonian Fluids in a Stirred Vessel

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