Mixing of complex fluids with flat-bladed impellers: effect of impeller geometry and highly shear-thinning behavior

Thakur, Rajeev K.; Vial, Christophe; Djelveh, Gholamreza; Labbafi, Mohsen

doi:10.1016/j.cep.2003.11.005

Cited by 50 publications

(51 citation statements)

References 11 publications

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“…Its value is normally obtained experimentally using the Metzner method and Rieger-Novak method [10,14,15]. The Metzner method defines the Re n and K pn by 2 2 n psu…”

Section: Nd Rementioning

confidence: 99%

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

Zhang

Jiang

et al. 2008

Chinese Journal of Chemical Engineering

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“…Its value is normally obtained experimentally using the Metzner method and Rieger-Novak method [10,14,15]. The Metzner method defines the Re n and K pn by 2 2 n psu…”

Section: Nd Rementioning

confidence: 99%

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

Zhang

Jiang

et al. 2008

Chinese Journal of Chemical Engineering

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“…For turbine agitators power consumption is usually expressed by the dimensionless Newton number N P (Equation (12)) and the rotational Reynolds number Re (Equation (13)) when no vortex is present. This procedure provides a single master curve that depends only on impeller geometry and can be used to predict power requirements for any given fluid properties (density ρ and viscosity μ), impeller dimensions and rotational speed [26]. In case of the leaching reactor, for the maximum recommended agitator speed, turbulent regime is achieved (Re ≈ 25,000), so NP is independent of Re and can be calculated graphically as 2 [25].…”

Section: Leaching Equipmentmentioning

confidence: 99%

Demonstration Plant Equipment Design and Scale-Up from Pilot Plant of a Leaching and Solvent Extraction Process

2015

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Germanium recovery from coal fly ash by hydrometallurgical procedures was studied at the pilot scale (5 kg of fly ash/h). Results were used to design the equipment of a demonstration-sized plant (200 kg of fly ash/h). The process is based on hydrometallurgical operations: firstly a germanium extraction from fly ash by leaching and a consequent Ge separation from the other elements present in the solution by solvent extraction procedures. Based on the experimental results, mass balances and McCabe-Thiele diagrams were applied to determine the number of steps of the solvent extraction stage. Different arrangements have been studied and a countercurrent process with three steps in extraction and six steps in elution was defined. A residence time of 5 min was fixed in both the extraction and elution stages. Volumetric ratios in extraction and stripping were: aqueous phase/organic phase = 5 and organic phase/stripping phase = 5, so a concentration factor of 25 is achieved. Mixers and decanters were completely defined. The maximum extracted and eluted germanium was estimated and a global efficiency of 94% was achieved. The cost-effectiveness of the equipment was estimated using the Lang factors.

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“…For the case of static flow condition, the maximum velocity of droplets is a function of interfacial tension between two liquid phases, density of two liquid phases, and viscosity of continuous phase [10]. In the agitated mixing vessel, the mean diameter of droplets is a function of Weber number [11], viscosity ratio between two phases, and the geometrical factors [12]. An increase in the slag volume leads to a reduction in metal losses because of the greater pressure of the slag column on the pig iron [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Flow Behavior of Molten Iron and Slag in Main Trough of Blast Furnace during Tapping Process

Wang

Pan

Cheng

2017

Advances in Numerical Analysis

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The three-dimensional model was developed according to number 4 of the main trough of blast furnace at China Steel Co. (CSC BF4). The -equations and volume of fluid (VOF) were used for describing the turbulent flow at the impinging zone of trough, indicating fluids of liquid iron, molten slag, and air in the governing equation, respectively, in this paper. The pressure field and velocity profile were then obtained by the finite volume method (FVM) and the pressure implicit with splitting of operators (PISO), respectively, followed by calculating the wall shear stress through Newton's law of viscosity for validation. Then, the operation conditions and the main trough geometry were numerically examined for the separation efficiency of iron from slag stream. As shown in the results, the molten iron losses associated with the slag can be reduced by increasing the height difference between the slag and iron ports, reducing the tapping rate, and increasing the height of the opening under the skimmer.

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Mixing of complex fluids with flat-bladed impellers: effect of impeller geometry and highly shear-thinning behavior

Cited by 50 publications

References 11 publications

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

Demonstration Plant Equipment Design and Scale-Up from Pilot Plant of a Leaching and Solvent Extraction Process

Numerical Analysis on Flow Behavior of Molten Iron and Slag in Main Trough of Blast Furnace during Tapping Process

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