Relevant bibliographies by topics / Rushton Turbine

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Rushton Turbine'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 June 2025

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Journal articles on the topic "Rushton Turbine"

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Ranade, V. V., M. Perrard, N. Le Sauze, C. Xuereb, and J. Bertrand. "Trailing Vortices of Rushton Turbine." Chemical Engineering Research and Design 79, no. 1 (2001): 3–12. http://dx.doi.org/10.1205/026387601528471.

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2

Belhanafi, Abdelghani, Zied Driss, and Mohamed Salah Abid. "Hydrodynamic Comparative Study on the Pumping Effects of a Square Tank Equipped with Single-Stage and Bi-Stage Impellers." Acta Universitatis Sapientiae, Electrical and Mechanical Engineering 14, no. 1 (2022): 1–12. http://dx.doi.org/10.2478/auseme-2022-0001.

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Abstract A computational fluid dynamics simulation is done for comparative study from the pumping effect on the four surfaces of the stirred tank. The flow field generated by one-stage and bi-stage six-bladed Rushton turbine in the unbaffled square tank was studied. The Reynolds-averaged Navier-Stokes equation with steady-state multi-reference frame approach (MRF) is used to simulate hydrodynamic flow in the tank. The turbulent viscosity, the turbulent kinetic energy and mean velocity distributions obtained in vertical and horizontal plans are analyzed and discussed. We can deduce that the additional Rushton turbine in the upper part of the square tank improves the quality of the mixture.
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Fan, Jun Ling, and De Yu Luan. "Numerical Simulation of Laminar Flow Field in a Stirred Tank with a Rushton Impeller or a Pitch 4-Bladed Turbine." Advanced Materials Research 557-559 (July 2012): 2375–82. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.2375.

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Computational fluid dynamics (CFD) method was applied to the study of flow field in the agitation of glycerin fluid with a Rushton impeller and a pitch 4-bladed turbine. The flow was modeled as laminar and a multiple reference frame (MRF) approach was used to solve the discretized equations of motion. The velocity profiles predicted by the simulation with four different impellers rotating at constant speed of 200r/min were obtained. By analysis to their axial, radial and tangent velocity vector plots, velocity contours and velocity distribution curves, it was found that the stirred effect of the Rushton impeller was better than one of the pitch 4-bladed turbines，however，accompanied with high power consumption according to the calculated values of required power. Moreover, there were all similar flow characteristics for the pitch 4-bladed turbines with different blade pitch angle. The research provided a theoretical basis for the design and practical application of the stirred tank under laminar flow.
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Ståhl Wernersson, Eva, and Christian Trägårdh. "Scale-up of Rushton turbine-agitated tanks." Chemical Engineering Science 54, no. 19 (1999): 4245–56. http://dx.doi.org/10.1016/s0009-2509(99)00127-x.

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5

Sadikin, Azmahani, Md Iskandar Md Noor, Norasikin Mat Isa, Siti Mariam Basharie, and Amir Khalid. "Pressure Distribution around Mixing Blades in Biodiesel Reactor Using Computational Fluid Dynamics (CFD)." Applied Mechanics and Materials 554 (June 2014): 381–85. http://dx.doi.org/10.4028/www.scientific.net/amm.554.381.

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This paper presented simulation analysis of stress distribution along a mixing blades propeller used in biodiesel reactor tank. The mixing blade types used are: (1) three bladed mixing propeller, (2) pitch turbine blade and (3) Rushton blade. ANSYS FLUENT software was used to run the simulation. The maximum stress occurs when using three bladed mixing propellers type. The minimum stress occurs when using the Rushton blade. Therefore, the Rushton blade is the best blade used for biodiesel reactor. Stress concentration is observed at the fillet for all blade types. The selection of the right type mixing blade can improve the biodiesel production and lower the maintenance cost. The result obtained from the simulation is agreed well with the published data.
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Bliem, Volker, and Heyko Jürgen Schultz. "Investigation of Horizontal Velocity Fields in Stirred Vessels with Helical Coils by PIV." International Journal of Chemical Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/763473.

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Horizontal velocity flow fields were measured by particle image velocimetry for a stirred vessel with baffles and two helical coils for enlargement of heat transfer area. The investigation was carried out in a cylindrical vessel with flat base and two different stirrers (radial-flow Rushton turbine and axial-flow propeller stirrer). Combined velocity plots for flow fields at different locations are presented. It was found that helical coils change the flow pattern significantly. Measurements for the axial-flow Rushton turbine showed a strong deflection by the coils, leading to a mainly tangential flow pattern. Behind baffles large areas of unused heat transfer area were found. First results for the axial-flow propeller reveal an extensive absence of fluid movement in the horizontal plane. Improved design considerations for enhanced heat transfer by more compatible equipment compilation are proposed.
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Zhang, Yulong, Zhengming Gao, Zhipeng Li, and J. J. Derksen. "Transitional flow in a Rushton turbine stirred tank." AIChE Journal 63, no. 8 (2017): 3610–23. http://dx.doi.org/10.1002/aic.15809.

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8

Nienow, A. W. "Hydrodynamics of Stirred Bioreactors." Applied Mechanics Reviews 51, no. 1 (1998): 3–32. http://dx.doi.org/10.1115/1.3098990.

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This review of the hydrodynamics of stirred bioreactors begins with an introduction to the agitation problems of particular concern in such systems. This is followed by a brief review of some basic concepts in turbulence and rheology of relevance to bioreactors. Important aspects of single phase mixing in low viscosity, high viscosity and Theologically complex broths are then covered in some detail including flow patterns, power number versus Reynolds number plots (including the modification of the latter to allow for shear thinning broths), flow numbers, energy dissipation rates and flow close to impellers and between multiple impeller systems. From these basic principles, the problem of homogenization is then covered in depth because of its significance for bioreactor performance. Aeration concepts are then introduced and the behavior of traditional Rushton turbine impellers is then treated in detail, covering the flow patterns, aerated power characteristics, mixing time and scale-up considerations. The weaknesses of the Rushton turbine are then discussed which leads into a section describing how more modern impellers are able to improve on many of these, especially emphasising their ability to introduce more energy dissipation into the broth and handle more air before flooding, both of which enhance oxygen transfer. The improvement in bulk blending found with multiple axial flow agitators is brought out too. Finally, the retrofitting of fermenters originally containing Rushton turbines with these more modern impellers is discussed. In conclusion, it is clear that there have been substantial increases in the understanding of stirred bioreactor hydrodynamics. However, whilst further understanding will occur within the framework discussed here, the expectation must be that computational fluid dynamics will increase in importance in spite of the difficulty of handling complex rheology, multiphase systems and biological responses. This review article has 135 references.
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Ochieng, Aoyi, and Maurice Onyango. "CFD simulation of the hydrodynamics and mixing time in a stirred tank." Chemical Industry and Chemical Engineering Quarterly 16, no. 4 (2010): 379–86. http://dx.doi.org/10.2298/ciceq100211040o.

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Hydrodynamics and mixing efficiency in stirred tanks influence power draw and are therefore important for the design of many industrial processes. In the present study, both experimental and simulation methods were employed to determine the flow fields in different mixing tank configurations in single phase system. The laser Doppler velocimetry (LDV) and computational fluid dynamics (CFD) techniques were used to determine the flow fields in systems with and without a draft tube. There was a reasonable agreement between the simulation and experimental results. It was shown that the use of a draft tube with the Rushton turbine and hydrofoil impeller resulted in a reduction in the homogenization energy by 19.2% and 17.7%, respectively. This indicates that a reduction in the operating cost can be achieved with the use of a draft tube in a stirred tank and there would be a greater cost reduction in a system stirred by the Rushton turbine compared to that stirred by a propeller.
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Dai, Li, Li Bin Yang, and Kai Liu. "Numerical Investigation on the Stirred Reactor with Rushton Turbine." Advanced Materials Research 881-883 (January 2014): 1823–26. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1823.

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Computational Fluid Dynamics (CFD) simulation is expected to give detailed flow information which is important for stirred reactor design and optimization, however accurate flow prediction remains a challenge for CFD application. In the present paper, influence of discretization scheme on the flow prediction in a stirred reactor with Rushton turbine was investigated. Standardk-εturbulent model and MRF model was adopted and numerical results obtained by using three different discretization schemes were compared. Results showed that the numerical results agreed well with data provided in literature. It is acceptable to use any discreticaiton method if aiming at a general flow field, while QUICK is recommended considering the more detailed flow information.
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Dissertations / Theses on the topic "Rushton Turbine"

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Ochieng, A., MS Onyango, A. Kumar, K. Kiriamiti, and P. Musonge. "Mixing in a tank stirred by a Rushton turbine at a low clearance." Elsevier, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000754.

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Mixing efficiency in stirred tanks is an important consideration in the design of many industrial processes. Computational fluid dynamics (CFD) techniques have been employed in the present work to study the hydrodynamics in a tank stirred by a Rushton turbine. The effect of the impeller clearance on the velocity field and mixing has been investigated. It has been shown that at a low impeller clearance, the Rushton turbine generates a flow field that evolves from the typical two loops to a single loop flow pattern similar to that of an axial impeller. This single loop flow pattern resulted in an increase in axial flow and a decrease in mixing time at a constant power number. It has been found that a draft tube can be used with a single Rushton turbine, at a low clearance to aid axial flow and mixing, and this resulted in 50% reduction in mixing time. There was a good comparison between laser Doppler velocimetry (LDV) experimental and CFD simulation flow fields, both of which showed that the draft tube improved mixing in the tank by suppressing secondary circulation loops.
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Leka, Suida. "On mixing and aeration of Rushton turbine stirred tanks." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The present study investigates the influence of the fluid properties on the mixing and aeration process of a Rushton turbine stirred tanks. Once the Rushton turbine agitated reactor is designed and developed following common standards, the effects of the viscosity, density, and surface tension on the bubbling process are evaluated. The size of single gas bubbles issued from a submerged nozzle is estimated at constant gas flow rate varying the orifice diameter, gas phase injected, and the liquid medium. Four orifice diameters are used: 0.6 mm, 1.0 mm, 2.0 mm, and 5.0 mm in diameter. As liquid medium, glycerine aqueous solutions at three different glycerine volume concentrations (20%, 40% and 60%), salt aqueous solution (300 g/L of salt) and surfactant solutions using Tween 20 at 0.01 mM and 0.1 mM concentrations, are employed for the experiments. Instead, air and argon are used to analyse the influence of the gas properties on the bubble size. Subsequently, the evaluations of the bubble frequency, the time rising, gas hold up and power consumption are performed considering all the investigated solutions. The mentioned experiments are carried out at three different impeller speed: 0, 185 and 315 RPM. It has been found that the fluid properties have an important role on the bubble size which largely influence the gas frequency, the time rising, and the gas hold up. Finally, the objective is to study qualitatively the shape of the gaseous cavities in relation with the agitator speed and the gas phase flow rate in order to understand in which flow regime the different gas cavities are present. The experiments are carried out using water as liquid medium and air for the gas phase. Two different cases are investigated. In the first case, the impeller speed was varied from 150 RPM to 600 RPM, maintaining constant the gas flow rate at 0.5 L/min. In the second case, the impeller speed has been kept constant at 500RPM and the gas flow rate varied from 0.5 L/min to 1.5 L/min.
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Escudié, Renaud. "Structure de l'hydrodynamique générée par une turbine de Rushton." Toulouse, INSA, 2001. http://www.theses.fr/2001ISAT0040.

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L'hydrodynamique 3D générée par une turbine de Rushton est analysée expérimentalement à l'aide de la technique de mesure P. I. V. . Une technique de moyenne de phase est mise en œuvre pour extraire les mouvements moyen, turbulent et organisé lié au passage périodique des pales de l'agitateur. Les résultats sont tout d'abord validés par rapport aux nombreuses données de la bibliographie. La technique de décomposition triple est utilisée pour quantifier les échanges d'énergie cinétique entre les trois mouvements ; les termes présents dans les équations de bilan d'énergie cinétique des trois mouvements sont calculés et le taux de dissipation visqueux de l'énergie cinétique turbulente est estimé. Une définition objective des tourbillons est mise en place pour localiser les vortex traînants et leur trajectoire dans la cuve : les interactions entre ces structures et les mouvements moyen et turbulent sont quantifiées. Nous terminons par la caractérisation des structures de la turbulence en termes d'échelles (Kolmogorov, Taylor, macro-échelle) et d'anisotropie<br>The 3D hydrodynamic generated by a Rushton turbine is analyzed by P. I. V. Technique. Phase average acquisition is performed in order measure mean velocity field, turbulent motion and organized flow induced by the impeller blade (trailing vortices). Results are compared firstly to previous works. Triple decomposition method enables to quantify kinetic energy exchanges between the three motions. Moreover, one can calculate the terms that constitute the kinetic energy balance of the three motions: in particular, the viscous dissipation rate of turbulent kinetic energy is estimated. An objective definition of vortex is used to locate the trailing vortices and their trajectories through the tank: interactions between organized structure and mean and turbulent flows are outlook. Finally, the structure of turbulence is defined in terms of length-scales (Kolmogorov, Taylor, macro scale) and anisotropy
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Belgacem, Mayouf. "Étude de réacteurs équipés de turbines autoaspirantes : modélisation et simulation pour le cas d'une turbine Rushton." Vandoeuvre-les-Nancy, INPL, 2000. http://www.theses.fr/2000INPL131N.

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L'étude a porté sur le fonctionnement de contacteurs gaz-liquide alimentés en gaz par une ou deux turbines autoaspirantes. Les mobiles étudiés sont la turbine Rushton et la turbine à pales inclinées à pompage bas. Dans la première partie de ce travail, le cas d'une seule turbine autoaspirante a été étudié. Les paramètres de l'hydrodynamique globale et locale, ainsi que le transfert de matière ont été déterminés pour chacun des mobiles et pour différentes configurations géométriques. Ce travail a permis de mettre en évidence les différents régimes existants pour la turbine Rushton autoaspirante et de les comparer au cas d'une turbine Rushton alimentée par un distributeur de gaz. La modélisation et la simulation d'un réacteur équipé d'une seule turbine autoaspirante Rushton ont également été faites. La comparaison des deux types de mobiles, Rushton et à pales inclinées montre que cette dernière est très intéressante comme mobile autoaspirant et présente des performances similaire à celles de la turbine Rushton , jusqu'à 3,5 kW/m3. La deuxième partie de cette thèse a porté sur l'association de deux turbines, dont au moins une est autoaspirante. Nous avons d'abord montré l'existence de la double autoaspiration. Puis nous avons étudié différentes associations de mobiles (turbine Rushton, turbines à pales inclinées à pompage haut et bas), autoaspirante ou pas, et identifié les paramètres géométriques (position des mobiles les uns par rapport aux autres et par rapport au bas du réacteur) qui peuvent influencer les performances du réacteur (rétention gazeuse globale, débit gazeux autoaspiré et le transfert de matière). L'association de deux turbines Rushton a ainsi été montrée comme la plus performante. Enfin, la comparaison avec un réacteur monoétagé permet de noter les avantages du multi-étagé autoaspirant qui permet d'atteindre des taux de rétention gazeuse nettement supérieur et des valeurs du coefficient volumique de transfert de matière kLa jusqu'à trois fois plus grand.
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Costes, Jean. "Structure des écoulements générés par une turbine de Rushton dans une cuve chicanée." Toulouse, INPT, 1986. http://www.theses.fr/1986INPT012G.

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La structure des ecoulements d'eau generes par une turbine de rushton dans une cuve agitee munie de 4 chicanes verticales est etudiee dans 3 unites d'agitation realisees en similitude geometrique (50, 70 et 200 litres). Les vitesses moyenne et fluctuante ainsi que les structures fines de la turbulence sont mesurees par anemometrie et anemometrie doppler a laser. Les deux methodes sont comparees. Les profils de la vitesse moyenne adimensionnelle et de la moyenne quadratique des fluctuations de vitesse adimensionnelle sont pratiquement independantes de la taille de l'unite et du nombre de reynolds rapporte a l'agitateur. La structure fine de la turbulence (spectre de frequence, macroechelles, puissance dissipee) est independante de la taille de l'unite et du nombre de reynolds
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Costes, Jean. "Structure des écoulements générés par une turbine de Rushton dans une cuve chicanée." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375968372.

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Vlachakis, Vasileios N. "Turbulent Characteristics in Stirring Vessels: A Numerical Investigation." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34599.

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Understanding the flow in stirred vessels can be useful for a wide number of industrial applications, like in mining, chemical and pharmaceutical processes. Remodeling and redesigning these processes may have a significant impact on the overall design characteristics, affecting directly product quality and maintenance costs. In most cases the flow around the rotating impeller blades interacting with stationary baffles can cause rapid changes of the flow characteristics, which lead to high levels of turbulence and higher shear rates. The flow is anisotropic and inhomogeneous over the entire volume. A better understanding and a detailed documentation of the turbulent flow field is needed in order to design stirred tanks that can meet the required operation conditions. This thesis describes efforts for accurate estimation of the velocity distribution and the turbulent characteristics (vorticity, turbulent kinetic energy, dissipation rate) in a cylindrical vessel agitated by a Rushton turbine (a disk with six flat blades) and in a tank typical of flotation cells. Results from simulations using FLUENT (a commercial CFD package) are compared with Time Resolved Digital Particle Image Velocimetry (DPIV) for baseline configurations in order to validate and verify the fidelity of the computations. Different turbulence models are used in this study in order to determine the most appropriate for the prediction of turbulent properties. Subsequently a parametric analysis of the flow characteristics as a function of the clearance height of the impeller from the vessel floor is performed for the Rushton tank as well as the flotation cell. Results are presented for both configurations along planes normal or parallel to the impeller axis, displaying velocity vector fields and contour plots of vorticity turbulent dissipation and others. Special attention is focused in the neighborhood of the impeller region and the radial jet generated there. This flow in this neighborhood involves even larger gradients and dissipation levels in tanks equipped with stators. The present results present useful information for the design of the stirring tanks and flotation cells, and provide some guidance on the use of the present tool in generating numerical solutions for such complex flow fields.<br>Master of Science
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Assirelli, Melissa. "Micromixing studies in turbulent stirred baffled and unbaffled vessels agitated by a Rushton turbine : an experimental study." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.626864.

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The parallel-competing iodide-iodate reaction scheme has been used to study micromixing phenomena in baffled and unbaffled vessel of 0.29 m diameter (T) agitated by a Rushton turbine (D=1/3T) under turbulent conditions in a semi-batch mode. Firstly it was confirmed that by using successive injections, this reaction scheme is very efficient for such a study. Using this technique for the rest of the programme of work the first experiments were undertaken in the “standard baffled geometry”. Four agitator speeds giving mean specific energy dissipation rates, T ε , from ~0.2 W/kg to ~1.2 W/kg were used. For a given speed, addition at five different static feed locations, one just above the liquid surface and four submerged, were investigated. The four sub-surface feeding positions were associated with different local specific energy dissipation rates, εT, ranging from less than T ε , very close to the top of the liquid, to much greater close to the impeller. The point closest to the impeller was chosen to be such that feeding was estimated to be at the point of (εT)max. For the maximum speed, the segregation index, Xs, as a measure of the amount of 'waste product', was ~20% with feed onto the top of the liquid (as preferred industrially because of its convenience) or if slightly submerged. This 'waste' was reduced to ~5% by feeding at (εT)max. The distribution of εT was estimated from numerical solutions of the incorporation model combined with relationships arising from turbulence concept. A comparison was also made with results reported in the literature using the same reaction for two new devices developed for improved micromixing. By feeding at the carefully chosen position close to the impeller, the results with the Rushton turbine were as good as or better than with the special devices even at the comparatively low T ε of ~1.2 W/kg. It was estimated that the ratio of T T ε /ε (=φ) gave a maximum circumferentially averaged value of φ of ~90. The iodide-iodate technique was then used to ascertain the effectiveness of micromixing in a standard baffled reactor when feeding with pipes rotating with the impeller and discharging continuously into the region of (εT)max. The results when compared with those obtained using the fixed pipe at the equivalent position showed a significant intensification. Overall, a seven-fold reduction in ‘waste product’ was found between the most convenient fixed feed pipe position above the liquid surface and the rotating pipes, even at the modest T ε of ∼1.0 W/kg. This study is the first to use feeding continuously into the region of (εT)max. Thus an angular resolved (εT)max could be estimated from the incorporation model compared to a circumferentially averaged (εT)max obtained with a fixed pipe. The former was ∼3.0 times the latter, in close agreement with recent PIV based measurements. Finally the same geometry but without baffles was studied. The power number Po was measured and found to be Po=0.8, much less than Po=4.3 for the baffled tank. Visual decolourisation to give the macromixing time θm revealed evidence of a poor mixing region corresponding to the forced vortex region. The poor mixing in this region was confirmed by micromixing experiments. At the same T ε of 0.18 W/kg in the two cases, the values of segregation index, Xs, were found to be from ∼50% to 40% less than those III obtained with the baffled configuration except in the region close to the impeller where similar Xs values were found. These results are considered surprising, the unbaffled vessel proving much more effective for micromixing then expected. However, these improvements are limited by the very low maximum specific power input of 0.18 W/kg achievable with this configuration. Using the same micromixing model, all local (εT) values were > T ε . Clearly, this result is wrong. It is postulated that the swirling vortex flow past the fixed feed tube may give rise to a high very localised εT value. Clearly, further experimental and modelling work is required to gain a better understanding of the flow structure and micromixing in unbaffled vessels.
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Michelet, Stéphane. "Turbulence et dissipation au sein d'un réacteur agité par une turbine Rushton : velocimétrie laser Doppler à deux volumes de mesure." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL128N.

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Cette thèse propose une étude expérimentale de la turbulence au sein d'un réacteur agité standard muni d'une turbine Rushton, fonctionnant en régime monophasique. L'anémométrie laser à deux volumes de mesure a été développée, sur la base d'un velocimètre bi-composante, pour permettre la mesure directe des variances des gradients des fluctuations de vitesse dont est composé le taux moyen local de dissipation d'énergie cinétique de turbulence epsilon. La technique est validée, avec moins de 5% d'écart, dans le cadre d'une turbulence de grille ou epsilon est connu. La comptabilité de la résolution spatiale obtenue avec les échelles de l'écoulement autorise l'utilisation de cette technique dans les mélangeurs. Après avoir identifié et extrait la contribution périodique due au passage des pales, les mesures d’epsilon montrent que : _ plus de 60% de l'énergie mécanique injectée sur l'arbre de la turbine est dissipée dans la région des chicanes et dans les couches limites de paroi. _ la turbulence peut être considérée comme localement isotrope dans l'ensemble du réacteur. _ en comparaison avec les résultats expérimentaux, le calcul d’epsilon par : epsilon = A((q²)³/²)/L donne des valeurs bien supérieures à proximité de l'agitateur et du même ordre de grandeur dans les zones de recirculation. Une étude des échelles de la turbulence a été conduite dans l'ensemble du réacteur. Ceci a amené à la modification de l'hypothèse de Taylor, en tenant compte notamment de la vitesse de convection des structures cohérentes mesurée dans le refoulement de la turbine, à partir des corrélations spatio-temporelles des fluctuations de vitesse. Enfin, le jet généré par le mobile a été modélisé à partir des équations de la dynamique. Une viscosité dynamique a été introduite et un bon accord a été trouvé entre les mesures expérimentales et les profils analytiques trouvés.
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Yapici, Kerim. "Numerical Investigation Of Stirred Tank Hydrodynamics." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1302140/index.pdf.

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A theoretical study on the hydrodynamics of mixing processes in stirred tanks is described. The primary objective of this study is to investigate flow field and power consumption generated by the six blades Rushton turbine impeller in baffled, flat-bottom cylindrical tank both at laminar and turbulent flow regime both qualitatively and quantitatively. Experimental techniques are expensive and time consuming in characterizing mixing processes. For these reasons, computational fluid dynamics (CFD) has been considered as an alternative method. In this study, the velocity field and power requirement are obtained using FASTEST, which is a CFD package. It employs a fully conservative second order finite volume method for the solution of Navier-Stokes equations. The inherently time-dependent geometry of stirred vessel is simulated by a multiple frame of reference approach. The flow field obtained numerically agrees well with those published experimental measurements. It is shown that Rushton turbine impeller creates predominantly radial jet flow pattern and produces two main recirculation flows one above and the other below the impeller plane. Throughout the tank impeller plane dimensionless radial velocity is not affected significantly by the increasing impeller speed and almost decreases linearly with increase in radial distance. Effect of the baffling on the radial and tangential velocities is also investigated. It is seen that tangential velocity is larger than radial velocity at the same radial position in unbaffled system. An overall impeller performance characteristic like power number is also found to be in agreement with the published experimental data. Also power number is mainly affected by the baffle length and increase with increase in baffle length. It is concluded that multiple frame of reference approach is suitable for the prediction of flow pattern and power number in stirred tank.
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Books on the topic "Rushton Turbine"

1

Structure des écoulements générés par une turbine de Rushton dans une cuve chicanée. 1986.

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Book chapters on the topic "Rushton Turbine"

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Mahouast, M. "Reynolds Stresses and Stirring Regimes of a Rushton Turbine." In Fluid Mechanics and Its Applications. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-7973-5_22.

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Sharp, K. V., K. C. Kim, and R. Adrian. "Dissipation Estimation Around a Rushton Turbine Using Particle Image Velocimetry." In Laser Techniques Applied to Fluid Mechanics. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-56963-0_22.

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Mulampaka, Aishwarya, and K. S. Rajmohan. "Computational Study of Mixing of Shear Thinning Fluids with Modifications in Rushton Turbine Impeller." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6928-6_1.

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Peña, Anieval, Steve Camargo, Frando Condor, Angela Tunque, and Ashley Verano. "Design of a Rushton Turbine for the Improvement of the Bioreactor in the Wastewater Treatment Plant in the City of Morococha (Carhuacoto)-Peru." In Springer Proceedings in Earth and Environmental Sciences. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27803-7_2.

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Escudié, Renaud, Alain Liné, and Michel Roustan. "Turbulent Macroscale in the Impeller Stream of a Rushton Turbine." In 10th European Conference on Mixing. Elsevier, 2000. http://dx.doi.org/10.1016/b978-044450476-0/50045-5.

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Orvalho, Sandra C. P., Jorge M. T. Vasconcelos, and Sebastião S. Alves. "Hold-up and gas-liquid mass transfer performance of modified Rushton turbine impellers." In 10th European Conference on Mixing. Elsevier, 2000. http://dx.doi.org/10.1016/b978-044450476-0/50058-3.

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Bartels, C., M. Breuer, and F. Durst. "Comparison between Direct Numerical Simulation and κ-ɛ Prediction of the Flow in a Vessel Stirred by a Rushton Turbine." In 10th European Conference on Mixing. Elsevier, 2000. http://dx.doi.org/10.1016/b978-044450476-0/50031-5.

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"Fig. 12 Radial (Rushton) type impeller. blade angle, it is best to work closely with the manufacturers of the mixer to specify an optimum design for the process. The preceding discussion of axial- and radial-flow turbines has been a very cur-sory survey of what can be a very involved and detailed study. As mentioned above, a large amount of research on these types of mixers is available [13,14]. A detailed dis-cussion of this subject would be beyond the scope of this work. If a blending or sus-pension problem occurs in large production batches, consultation of the references on mixing included at the end of this chapter or, even better, consulting the experts at the major manufacturers of this type of mixer, would be the best place to start. 3. Anchor Mixers An often overlooked mixing device, which is low speed and considered low capabil-ity, is the anchor agitator, so named for its anchorlike shape, as illustrated in Fig. 13. However, this slowly moving agitator makes it possible for many dispersion and emul-sification processes to be accomplished without overshear, aeration, and heat transfer problems. The anchor agitator is a slow (up to 50 rpm) device whose sole function is to rotate the contents of a batch in a radial direction without providing any significant shear. These are high-torque devices that must be designed sturdily to withstand the forces of the high viscosities. Anchor agitators are typically designed to be able to withstand a maximum viscosity beyond which they might actually bend or break. That is, the an-chor itself is built of materials strong enough to withstand the drag of the viscous liq-uid as it passes by the mixer. In addition, the motor has to supply the very high torque requirement that arises when the anchor is stirring viscous materials. When designing the mixer it is important not to understate the viscosity. This is especially important if there is a point in the process where the anchor must be stopped. If this happens, in the case of shear thinning materials, the agitator has to start up from rest in a viscosity much higher than that normally occurring during the process. Products exhibiting pseudoplastic or Bingham plastic behavior are very difficult to move when at rest." In Pharmaceutical Dosage Forms. CRC Press, 1998. http://dx.doi.org/10.1201/9781420000955-40.

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Conference papers on the topic "Rushton Turbine"

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Chara, Z., B. Kysela, and I. Fort. "Hydraulic efficiency of a Rushton turbine impeller." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992175.

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Chara, Zdenek, and Bohus Kysela. "Comparison of saw tooth impeller and Rushton turbine." In CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113988.

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Devi, Thiyam Tamphasana, and Bimlesh Kumar. "Turbulent Dissipation Rates in a Baffled Stirred Tank of Rushton Turbine." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_662.

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Šulc, R. "Gas-To-Liquid Heat Transfer in a Vessel Agitated by a Rushton Turbine." In 17th European Conference on Mixing. MIXING17 - 17th European Conference On Mixing, 2024. http://dx.doi.org/10.52202/074122-0054.

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Idžakovičová, K., J. Haidl, O. Gebouský, and M. Isoz. "Mixing Characteristics of a Magnetically Driven Rushton Turbine in an Unbaffled Stirred Tank Reactor." In Topical Problems of Fluid Mechanics 2023. Institute of Thermomechanics of the Czech Academy of Sciences; CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics, 2023. http://dx.doi.org/10.14311/tpfm.2023.009.

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The standard and well-researched stirred vessel configuration comprises a tank equipped with one or more impellers positioned in the vessel’s axis and multiple wall-mounted baffles preventing the central vortex creation. However, particular industries, such as biotechnology, have an increased need for a sterile environment that often results in the usage of atypical stirred vessel configurations. An example of a commonly equipped atypical stirred vessel is an unbaffled stirred tank with an eccentric magnetically driven impeller. However, there is only a little knowledge about the mixing characteristics of such designs. In this work, we list experimental results for both the standard and atypical stirred vessel configurations. Furthermore, we present a CFD model of the atypical configuration. The model is used to calculate its mixing characteristics that are subsequently compared against our experimental results. It is shown that for the liquid height (H) to the vessel diameter (T) ratio H/T ≲ 1.2, the characteristics of both the standard and atypical designs coincide. For higher liquid heights (i) the characteristics of the atypical design decrease dramatically, and (ii) the characteristics estimates based on approaches developed for the standard configuration become unreliable.
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Behanifia, Kada, Lakhdar Rahmani, Mebarki Brahim, and Khaled Al-Farhany. "Numerical investigation of laminar stirring viscous fluid inside stirred tank with newly Rushton turbine design." In CONFERENCE ON MATHEMATICAL SCIENCES AND APPLICATIONS IN ENGINEERING: CMSAE-2021. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0148171.

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Cavadas, Adélio S., and Fernando T. Pinho. "Power Consumption of Polymer Solutions in a Stirred Vessel Powered by an Hyperboloid Impeller." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/fed-24905.

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Abstract Measurements of power consumption in stirred vessel flows powered by a Rushton and an hyperboloid impeller were carried out. The fluids were aqueous solutions of tylose, CMC and xanthan gum at weight concentrations ranging from 0.1% to 0.6% and also included Newtonian fluids. For the Rushton turbine flows the addition of polymer increased the Newton number by about 13–20% at Reynolds numbers in the range 1,000–3,000, whereas with the hyperboloid impeller the Newton number decreased about 13%. This decrease was especially noticeable for the CMC solutions and was absent from the 0.2% tylose solution flow. Concentrated aqueous solutions of CMC (5.2%) and XG (3.6%) were also produced to determine the characteristic impeller parameter k for the hyperboloid, following the procedure of Metzner and Otto (1957) which was found to be 48 ±16.
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Basavarajappa, Manjunath, and Sanja Miskovic. "Numerical Study of Single Phase Liquid Mixing in Stirred Tanks Fitted With Rushton Turbine and Flotation Impeller." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65277.

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Mixing is a complex process and usually involves continuous reduction of length and time scales associated with fluid(s) being mixed. Mixing is an essential process and finds widespread application in a range of industries. Due to lack of understanding of the mixing process, industries lose a significant amount of money contributed by increased power consumption and longer process times. In this work a thorough comparison of flow, mixing, and turbulence characteristics of Rushton turbine (RT) and a flotation impeller, variation of disc turbine, is performed for single phase flows using Computational Fluid Dynamics (CFD). The fluid used is water. Base case validation and model verification is performed by comparing our CFD results with widely accepted Laser Doppler Anemometry (LDA) experimental results for the Rushton Turbine. Multiple reference frame (MRF) technique, a pseudo-steady modeling method, is used to model the impeller motion on flow characteristics at different Reynolds numbers (Re). Turbulence closure is provided using RANS based two equation realizable k-ε turbulence model. Grid independence studies are carried out a sufficiently fine grid is selected to capture the fine flow structures close to the impeller, though radial velocity close to impeller was under-predicted compared to experimental results. Effects of finite impeller blade and disc thicknesses on the local flow field, which are commonly modeled as thin surfaces, are explored. Various tank geometric variations, like different impeller clearances, and impeller diameter to tank diameter ratios (DI/DT), are also investigated. The numerical results will help in understanding the effect of impeller design on local and bulk flow characteristics and turbulence anisotropy close to the impeller. The results from this work will direct the tank and impeller design choices for two phase solid-liquid flows for future investigations.
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Gillis, Paul A., Gerrit Hommersom, and Matthias Scha¨fer. "A Comparison of Several CFD Approaches for Predicting Gas-Liquid Contacting in a Cylindrical Tank Agitated With a Single Rushton Turbine." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1571.

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The expansion of physical models integrated into Computational Fluid Dynamics (CFD) codes is broadening the range of problems being addressed. Multi-phase flow modeling techniques are becoming computationally stable and industrial applications are expanding. This paper focuses on modeling gas/liquid mixing in a stirred tank. This type of multi-phase reactor is widely used in the chemical and pharmaceutical industries. The performance of these reactors can be dependent upon the interfacial surface area. The objective of this work is to evaluate the current capabilities of various multiphase models for predicting the gas/liquid contacting. Accurate predictive models facilitate the screening of unconventional gas/liquid reactor designs, where full-scale trials can be cost prohibitive. Modeling results are compared against experimental data reported in 1977 by Smith and others. These experiments demonstrated the effect of impeller speed and gassing rate on the gas-liquid mass transfer rate, kLa. A standard baffled stirred tank configuration was used (H/T = 1, single Rushton impeller, D/T = 1/3). The data was compared to predictions for three different multiphase approaches. The first model evaluated was the steady Algebraic Slip Model (ASM) implemented in Fluent 5. The second model was a steady Euler/Euler formulation using CFX4. The third approach was a transient Euler/Euler method in Fluent 4. These algorithms employ a single bubble size in the dispersed-phase momentum equations. The effect of variation of the dispersed-phase bubble diameter is shown for the shear-dependent mean-size (SDMS) and the Multiple Size Group (MUSIG) models. The interphase interaction term for all models is commonly calculated using the assumption of rigid spherical bubbles. The effect of bubble distortion is illustrated by using an empirical correlation for bubble rise velocity. Both qualitative and quantitative comparisons are made between the experimental and numerical results. The qualitative comparisons examine the various flow regimes. The quantitative evaluations involve the prediction of interfacial area, overall gas hold-up, and the ratio of gassed impeller power to ungassed impeller power. These comparisons show the bubble size modeling have a significant positive impact on the prediction of gas-liquid contacting.
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Al-Subaey, Mohammed Y., Alberto Passalacqua, and Theodore J. Heindel. "Characterizing Air Entrainment at the Gas-Liquid Interface in Stirred Tank Reactors." In ASME 2024 Fluids Engineering Division Summer Meeting collocated with the ASME 2024 Heat Transfer Summer Conference and the ASME 2024 18th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/fedsm2024-130358.

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Abstract Air entrainment, or surface aeration, is common when the shear between a gas and liquid region is significant. Air entrainment is found in wind-driven flows at the gas-liquid interface of mixing systems and small and large-scale fermentation tanks. This gas-liquid mixing forms a multiphase flow, either promoting the separation of low-density components in a mixture or increasing oxidation, both of which could disrupt the yield of a fermentation process. This study utilizes a standard stirred tank reactor (STR) equipped with a Rushton-type disc turbine impeller and baffles to examine air entrainment at the gas-liquid interface. High-speed backlit imaging is employed to visualize and characterize the air entrainment. The impeller speed and distance between the impeller and the static liquid height significantly impact the amount of air drawn into the system. Substantial surface deformation is observed as a function of impeller speed and location, leading to different surface aeration mechanisms. An average imaging technique was used to characterize air entrained in the system. The results also show the fluid height and depth of entrained air penetration is affected by the impeller speed and location. Recommendations to quantify air entrainment magnitude due to surface aeration will be outlined and will be the focus of future work.
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