Power consumption and mixing time in rheologically complex fluids by a two-bladed impeller

Youcefi, Sarra; Youcefi, Abdelkader

doi:10.1007/s12206-015-0114-1

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…The curves of Eq. 2 for two different concentrations have the same shape but are offset relative to each other solution due to the influence of elasticity, which is greater for higher concentrations of 2.0 % and 1.0 % CMC solution of the laminar regime and early transition regime, respectively 37.…”

Section: Resultsmentioning

confidence: 93%

Mixing Efficiency of Viscous Fluid in a Multiple‐Impeller Agitated Tank

Shiue

Chen

et al. 2023

Chem Eng & Technol

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The development of a multi-impeller reactor for the mixing of non-Newtonian fluids under full flow regime conditions depends on mixing time, power consumption, and mixing energy. These parameters must be well-defined with 3-blade propellers, 4-pitched turbines, and 6-flat-blade turbines. An innovative expression of mixing time for the thermal pulse disturbance method is introduced. The Buckingham's p-theorem was utilized to denominate and transfer dimensionless power and homogenization number. To achieve consistent mixing, the results indicated that axial flow of the 4-pitched-blade turbine is the most effective approach. The examined correlation is a functional tool to determine the mixing energy based on the measured specific power consumption and mixing time.

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Section: Resultsmentioning

confidence: 93%

Mixing Efficiency of Viscous Fluid in a Multiple‐Impeller Agitated Tank

Shiue

Chen

et al. 2023

Chem Eng & Technol

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“…This type of mixer creates a tangential flow, i.e. the tangential velocity component dominates in the entire volume of the tank [20][21][22]. Based on this, changes in the tangential velocity are followed along the vessel radius for two angular positions (θ): θ = 0° (on the extension of the blade, Fig.…”

Section: Effect Of Diameter and Length Of The Bladementioning

confidence: 99%

“…Design of the impeller blade is an important parameter to be investigated in mixing systems [16][17][18][19][20][21][22][23][24]. Due to the different blade shapes available in industries, the fluid flows inside the vessel and the power consumed change, increasing the necessity of optimizing the blade geometry.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the Operating and Design Conditions to Reduce the Power Consumption in a Vessel Stirred by a Paddle Impeller

Ameur¹,

Kamla

Sahel

2018

Period. Polytech. Mech. Eng.

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Design of the impeller blade is a determining factor in power consumption and mixing quality, which determines consequently the cost of the mixing operation. This study explores the flow patterns and the power required for stirring a Newtonian fluid by paddle impellers. Investigations are carried out via three dimensional (3D) numerical simulations. Effects of the blade curvature, blade diameter, blade number and Reynolds number are analyzed. The curved blade is found to be more efficient to reduce the power consumption, compared with the straight blade. A new correlation is proposed for predicting the power required with two-curved-bladed impellers. The straight and very large blade creates a dead zone in the space between the blade tip and the vertical wall of vessel. This issue may be overcome by the curved blade, which increases consequently the well-mixed region size. A wider well-mixed region may be obtained with the larger curved blade, but with an additional energy cost.

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“…Also, the time-resolved PIV method was used to measure the angle-resolved velocity field near impeller blades in horizontal and vertical planes. Youcefi and Youcefi [17] measured the power consumption and the mixing time of a two-blade stirred tank during mixing viscoelastic fluids in the laminar region of the flow. Hamed Bashiri et al [18] investigated turbulent fluid flows in stirred tanks using a nonintrusive particle tracking technique.…”

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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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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Power consumption and mixing time in rheologically complex fluids by a two-bladed impeller

Cited by 15 publications

References 23 publications

Mixing Efficiency of Viscous Fluid in a Multiple‐Impeller Agitated Tank

Mixing Efficiency of Viscous Fluid in a Multiple‐Impeller Agitated Tank

Optimization of the Operating and Design Conditions to Reduce the Power Consumption in a Vessel Stirred by a Paddle Impeller

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

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