Chaotic mixing of a viscous fluid in a screw impeller mixer

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Chaotic mixing of a viscous fluid in a screw impeller ...

Jun 04, 1998  Several studies on model systems 1,2 have established the potential utility of the theory of chaotic systems for the analysis of mixing in laminar flow fields. Here

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Chaotic mixing of a viscous fluid in a screw impeller ...

Abstract. Several studies on model systems 1,2 have established the potential utility of the theory of chaotic systems for the analysis of mixing in laminar flow

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Data on mixing of viscous fluids by helical screw ...

May 25, 2016  2.1. Geometry studied. The mixing system studied is shown in Fig. 1.It is a cylindrical tank agitated by a screw impeller. Details of all geometrical parameters

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Chaotic mixing of a viscous fluid in a screw impeller ...

Several studies on model systems have established the potential utility of the theory of chaotic systems for the analysis of mixing in laminar flow fields. Here we

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High Viscosity Mixing Impellers - ProQuip Mixers

Aug 05, 2019  The following video demonstrates the mixing of the same high viscosity fluid used in the double-helix impeller video. The lab scale vessel is 13.25” diameter with

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(PDF) Performance of Helical Ribbon and Screw Impellers ...

Jun 11, 2018  The present paper deals with the mixing of a highly viscous fluid by close-clearance impellers in cylindrical vessels. The study is performed via numerical simulations.

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Thermal chaotic mixing of power-law fluids in a mixer with ...

Jun 01, 2010  We investigate the enhancement of both mixing and heat transfer in a two-rod mixer for highly viscous non-Newtonian fluids. The mixer is composed of t

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Performance of Helical Ribbon and Screw Impellers for ...

The present paper deals with the mixing of a highly viscous fluid by close-clearance impellers in cylindrical vessels. The study is performed via numerical simulations. Calculations are achieved by the discretization of continuity and momentum equations with the finite volume method. The effect of blade diameter and its shape on the well-stirred region size and the power consumption is ...

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Thermal Chaotic Mixing of Power-Law Fluids in a Mixer with ...

We investigate the enhancement of both mixing and heat transfer in a two-rod mixer for highly-viscous non-Newtonian fluids. The mixer is com-posed of two vertical circular rods in a cylindrical tank. Chaotic flows are obtained by imposing the temporal modulations of the rotational velocities of the walls.

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Flow and Mixing Performance in Helical Ribbon Mixers

Flow and Mixing Performance in Helical Ribbon Mixers Martin Robinson 1 and Paul W. Cleary CSIRO Mathematics, Informatics and Statistics Private Bag 33, Clayton South, Vic, 3168. Australia E-mail: [email protected] Abstract This paper explores the effect of impeller design on the chaotic mixing in a helical ribbon mixer.

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[PDF] Flow and mixing performance in helical ribbon mixers ...

Abstract This paper explores the effect of impeller design on the chaotic mixing in a helical ribbon mixer. Numerical simulations using the smoothed particle hydrodynamics (SPH) method are used to solve for the fluid flow around the moving impellor. The mixing flow is visualised by extracting the hyperbolic Lagrangian coherent structures (LCS) of the flow from the finite-time Lyapunov exponent ...

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Bakker A., Gates L.E. (1995) Viscous Mixing. Chemical ...

helical-ribbon impeller b. Screw impeller c. Single-flight helical-ribbon with an auger d. Anchor impeller therefore, are sometimes called close- clearance agitators. They guarantee liquid motion all the way to the wall of the tank, even for these very viscous materials, Helical impellers can also be manu- factured in a different configuration,

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Chaotic characteristics of pseudoplastic fluid induced by ...

[7] E. Galindot, A.W. Nienow, Mixing of highly viscous simulated xanthan fermentation broths with the Lightnin A-315 impeller, Biotechnol. Prog. 8(3) (2010) 233-239. [8] J. Sossa-Echeverria, F. Taghipour, Computational simulation of mixing flow of shear thinning non-Newtonian fluids with various impellers in a stirred tank, Chem. Eng. Process ...

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(PDF) Mixing of fluids Sandip Bakshi - Academia

Mixing is an integral part of chemical or physical processes f Fluids Mixing such as blending, dissolving, dispersion, suspension, emulsification, heat transfer, and chemical reactions. Dispersion characteristics can be considered as the mixing of two or more immiscible liquids, solids and liquids, or liquids and gases, into a pseudo ...

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Mixing of shear‐thinning fluids with yield stress in ...

Mar 31, 2006  The snapshot demonstrates that fluid does not mix down to a very small length-scale. As expected, no signs of chaotic mixing are observed since at low Re the flow is an effectively steady 2-D integrable system (every azimuthal slice through the system is identical). This situation is characterized by a linear rate of stretching, and mixing is ...

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EXPERIMENTAL AND NUMERICAL ANALYSIS OF CHAOTIC

By creating a chaotic flow inside a highly viscous fluid mixer, the fluid is mixed homogenously. So far, many attempts have been made to design a mixer with chaotic performance. The performance of the mixer is such that, by creating a perturbation in the flow, the flow path was changed and caused chaotic trajectories of fluid particles.

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Understanding High-Viscosity Mixing - Adhesives Mag

Jun 01, 2000  But there is more to designing a proper high-viscosity mixing system. First of all, viscous mixing systems should use laminar impellers, not turbulent impellers. Figure 3 shows various impeller-design configurations. Laminar impellers generally fill the entire mixing tank. In the viscous range, the formation of eddy currents is limited.

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Advances in 3D Numerical Simulation of Viscous and ...

Nov 20, 2010  While the simulation of flow and mixing for fluids of relatively simple rheological character (viscous Newtonian and non-Newtonian) has been done for complex geometries at a 3D level, there is a need for further work in simulating the mixing of more complex viscoelastic fluid models in full-scale continuous mixer geometries.

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Food Mixing: Principles and Applications Wiley

The mixing of liquids, solids and gases is one of the most common unit operations in the food industry. Mixing increases the homogeneity of a system by reducing non-uniformity or gradients in composition, properties or temperature. Secondary objectives of mixing include control of rates of heat and mass transfer, reactions and structural changes. In food processing applications, additional ...

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Thermal chaotic mixing of power-law fluids in a mixer with ...

Jun 01, 2010  We investigate the enhancement of both mixing and heat transfer in a two-rod mixer for highly viscous non-Newtonian fluids. The mixer is composed of t

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Thermal Chaotic Mixing of Power-Law Fluids in a Mixer with ...

We investigate the enhancement of both mixing and heat transfer in a two-rod mixer for highly-viscous non-Newtonian fluids. The mixer is com-posed of two vertical circular rods in a cylindrical tank. Chaotic flows are obtained by imposing the temporal modulations of the rotational velocities of the walls.

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MIXING ENHANCEMENT OF FLOWS IN STIRRED VESSELS BY

MIXING ENHANCEMENT OF FLOWS IN STIRRED VESSELS BY CHAOTIC ADVECTION Hyun Do Lee, Dong Hyun Lee, Wook Ryol Hwang School of Mechanical Engineering, Gyeongsang National University, Gajwa-dong 900, Jinju, KOREA, 660-701 [email protected] Abstract. We propose a new design of stirred vessels for mixing of highly viscous fluid, especially for

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Bakker A., Gates L.E. (1995) Viscous Mixing. Chemical ...

helical-ribbon impeller b. Screw impeller c. Single-flight helical-ribbon with an auger d. Anchor impeller therefore, are sometimes called close- clearance agitators. They guarantee liquid motion all the way to the wall of the tank, even for these very viscous materials, Helical impellers can also be manu- factured in a different configuration,

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Understanding High Viscosity Mixing Blog Hockmeyer ...

Oct 10, 2012  One of the fascinating aspects of high-viscosity mixing is that the mixer must accurately and intensely move the product. First of all, viscous mixing systems should use laminar impellers, not turbulent impellers. Laminar impellers generally fill the entire mixing tank. In the viscous range, the formation of eddy currents is limited.

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Mixing of shear‐thinning fluids with yield stress in ...

Mar 31, 2006  The snapshot demonstrates that fluid does not mix down to a very small length-scale. As expected, no signs of chaotic mixing are observed since at low Re the flow is an effectively steady 2-D integrable system (every azimuthal slice through the system is identical). This situation is characterized by a linear rate of stretching, and mixing is ...

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(PDF) Numerical investigation of the mixing efficiency of ...

Using computational fluid dynamics modeling to study the mixing of pseudoplastic fluids with a Scaba 6SRGT impeller By Leila Pakzad A fast and robust fictitious domain method for modelling viscous flows in complex mixers: The example of propellant make-down

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Mixing Chemical Processing Expert Forum: How Do I ...

Feb 25, 2013  The 17" diameter impeller will do little more than rotate the contents of the tank, which will not provide much mixing. However, I can give you a method for estimating the amount of torque required. The viscous power number for your impeller is 176. The viscous power number is a characteristic of the impeller geometry.

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EXPERIMENTAL AND NUMERICAL ANALYSIS OF CHAOTIC

By creating a chaotic flow inside a highly viscous fluid mixer, the fluid is mixed homogenously. So far, many attempts have been made to design a mixer with chaotic performance. The performance of the mixer is such that, by creating a perturbation in the flow, the flow path was changed and caused chaotic trajectories of fluid particles.

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Types of Agitators, Agitators Design and Usages for Mixing

Propeller agitators are popular for simple mixing jobs. Turbine Agitators: Turbine Agitators are widely used to perform all types of mixing operations and to handle fluid and liquid or gas reactions of various viscosity. Its ability to produce high radial flow facilitates the dispersion operation. Helical Agitators: These agitators have blades ...

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Tote Mixers - WMProcess - Industrial Mixing Equipment ...

Tote Mixer Impellers and Agitators Mixing impellers typically feature a 5.75″ diameter for direct drive mixers. Higher torque gear drive tote agitators feature a folding, collapsible mixing impeller that fits through the tote’s 6” top opening. A collapsible mixing impeller opens up to its full diameter once mixing

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Optimization of Viscous Mixing in a Two-Dimensional Cavity ...

Following up ideas put forward by J.M. Ottino and colleagues, the possibility of designing a computational tool to optimize the mixing of viscous fluids in industrial devices is studied. It is shown that an efficient method to characterize and quantify a mixing process is to apply the statistical measures introduced by Danckwerts (e.g., intensity of segregation and scale of segregation) on the ...

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High Shear Mixer: What Is It? How Does It Work? Types Of

Shearing forces mixing the components are generated by the relative motion of the rotating and stationary parts of the mixer. The rotating parts may be one or a set of impellers, paddles, or screws. The stationary parts, on the other hand, are the walls of the tank or chamber, and in some designs, baffles, and vanes.

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Advances in 3D Numerical Simulation of Viscous and ...

Nov 20, 2010  While the simulation of flow and mixing for fluids of relatively simple rheological character (viscous Newtonian and non-Newtonian) has been done for complex geometries at a 3D level, there is a need for further work in simulating the mixing of more complex viscoelastic fluid models in full-scale continuous mixer geometries.

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