In this part we interested to study the effects of the impeller angle of four agitator’s types (RT, CTB, DTBT and CTBT) on the hydrodynamic flow in tanks with The equipment used preeminently as a reactor in batch mode is the agitated tank, given its versatility and relative ease of installation [ 1 ]. Three-phase Study on the aggregate motion for gas–liquid–solid agitated tank
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Phosphoric Acid plant Slurry Tank; THICKENERS. Clarifying tanks make use of gravity to assist separation and sedimentation of liquid / solid mixtures from a blended phase. For example, Clarifying Tanks with In this study the CFD software Fluent 6 is used to simulate flow in a small baffled tank of standard geometry agitated by a Rushton turbine impeller. Simulations are CFD modelling of stirred tanks: Numerical considerations
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On the basis of computational fluid dynamics(CFD) software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade-Rushton-turbines(6 In this study the CFD software Fluent 6 is used to simulate flow in a small baffled tank of standard geometry agitated by a Rushton turbine impeller. Simulations are CFD modelling of stirred tanks: Numerical considerations
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Fluid Flow in Pachuca (Air-Agitated) Tanks: Part II. Mathematical Modeling of Flow in Pachuca Tanks R. SHEKHAR and J.W. EVANS A generalized mathematical The hydrodynamics and the flow field in an agitated vessel were measured using 2-D time resolved particle image velocimetry (2-D TR PIV). The experiments were Local Turbulent Energy Dissipation Rate in an Agitated
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Ståhl Wernersson, E. and Trägårdh, C., Turbulence characteristics in turbine-agitated tanks of different sizes and geometries, Chem. Eng. J., 1999, vol. 72, p. Section snippets Stirred tank configuration. The system investigated in this study consists of a 15 cm diameter cylindrical tank with four equally spaced baffles and agitated by a standard six-bladed Rushton turbine impeller (cf. Fig. 1).This system was chosen as it is more or less a research standard configuration for stirred tanks and is CFD modelling of stirred tanks: Numerical considerations
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However, on the second, they worked with a varying range of speed between 50 min −1 and 402 min −1 and found that U increased with an average of 6.83%. In the W + FW scenario, the overall heat transfer The system investigated in this study consists of a 15 cm diameter cylindrical tank with four equally spaced baffles and agitated by a standard six-bladed Rushton turbine impeller (cf. Fig. 1).This system was chosen as it is more or less a research standard configuration for stirred tanks and is sufficiently small to investigate very fine grids.CFD modelling of stirred tanks: Numerical considerations
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The Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computational fluid dynamics(CFD) software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade The Jorf Lasfar phosphate slurry pipeline in Morocco, commissioned in April 2014, is one of the world's largest slurry pipelines. The pipeline receives phosphate ore from the El Halassa, MEA and Daoui wash plants situated up to 22 km away.The product from these plants varies in grade and quality and is stored in separate agitated slurry tanks at The Design and Engineering of the 187 km Khouribga to Jorf
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The heating and cooling of non-Newtonian liquids in tanks with mechanical impellers are operations commonly employed as chemical reactors, heat exchangers, distillers, extractors, thinners and decanters. In particular, the design of heat exchangers (jackets, helical coils, spiral coils and vertical tubular baffles) in tanks We now extend the approach to handle two-fluid blending of non-Newtonian fluids. We focus here on agitated tanks and comparing model predictions to the measured data of Grenville (Grenville, 1992). The general system set-up, as presented in Fig. 2, is a baffled dish-bottom tank agitated by a single impeller centered in the tank. For the Blending and cavern formation within non-Newtonian fluids
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Fig. 2 shows maps of local Sauter mean bubble diameters, d 32, for a dual Rushton turbine agitated tank, in both non-coalescing liquid media and in tap water. It confirms a situation already revealed by the results of Barigou [19] and Barigou and Greaves [7], for a single turbine tank, namely, that average bubble size increases quickly in theThe Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computational fluid dynamics(CFD) software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade CFD simulation of local and global mixing time in an agitated tank
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low as 5.6% (Jameson, 1999). Mechanically agitated flotation cells are commonly used in the mineral industry with tank sizes up to 250 m3 (Deglon, 2005). They offer the advantages of large capacities, high aeration rates and vigorously turbulent parti-cle/droplet-bubble contacting. Mechanically agitated flotationA cylindrical stirred tank (transparent and flat bottomed) of 0.48 m diameter (T) was used for carrying out the solid-liquid mixing experiment as shown in Fig. 1.The tank was furnished with four equally spaced vertical baffles on its inner surface with a width of W = T/10 and a thickness of T/100.The fluid level of H = T = 0.48 m was fixed in the solid CFD simulation and experimental analysis of solid-liquid
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A numerical simulation of a solid–liquid mixture concentration field in a cone-bottom stirred tank (diameter D = 150 mm) was conducted using computational fluid dynamics (CFD). The influence of the 45° disk turbine impeller diameter on the mixing time number of solid–liquid mixture, mixing energy per unit volume, concentration standard The Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computational fluid dynamics(CFD) software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade CFD simulation of local and global mixing time in an agitated tank
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The heat transfer equation can be expressed as F 31 z2oyaTl 32T A 1 (8) and the boundary conditions for the upper part of the tank wall with a predicted temperature T,., are T=T0 for x=x1 (9) and T=T,, forz=Oatx1~xcCx2. (10) This is a generalized Leveque problem, the solution having been developed by Lighthill (1950).Several researchers have made valuable contributions on the thermal behavior and fluid flow within agitated tanks through a range of studies documented in the literature . Among them, Anne-Archard et al. [ 13 ] explored the distributions of shear rates and their correlation to power consumption during the mixing of power-law fluids usingEng Free Full-Text Agitation of Viscoplastic Fluid in a
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The heat transfer enhancement by using nanoparticles ranged 40- 114 % as compared with a single phase. CFD simulation was performed to predict the velocity field in the agitated tank and to predict the heat transfer coefficient in the double pipe heat exchanger in the presence and absence of nanofluid.A rigorous gas–liquid mass transfer model based on Maxwell–Stefan diffusion and two-film theory was validated against dynamic oxygen transfer experiments and exit gas analysis with mass spectrometry. A multiblock stirred tank model, which consists of 21 ideally mixed subregions, was used to consider non-ideal mixing in the Modelling Local Gas–Liquid Mass Transfer in Agitated Vessels
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The results of the power consumption for an agitated vessel equipped with vertical tubular baffles and high-speed impeller are presented in the paper. Aqueous solutions of CMC were agitated within transitional range of the non-Newtonian liquid flow in the agitated vessel of inner diameter equal to 0.6 m. Eight different types of the impellers The aim of this paper is to study the effect of agitator’s types on the turbulent flows in stirred tanks without and with baffles. The hydrodynamics behavior induced by four different agitator’s types: a Rushton turbine (RT), a circular blade turbine (CBT), a diverging triangular blade turbine (DTBT) and converging triangular blade Effect of Agitator’s Types on the Hydrodynamic Flow in an Agitated Tank
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Mixing in agitated tanks can be done in continuous or batch reactor. Proper mixing result is important for reducing investment and operating costs, providing high yields when mas transfer is limiting, and thus enchasing effectiveness. Processing with mechanical or chemical mixers follows under either laminar or turbulent flow conditions,
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