Ekman pumping and intermittent particle resuspension in a stirred tank reactor

Lavezzo, Valentina; Verzicco, Roberto; Soldati, Alfredo

doi:10.1016/j.cherd.2009.01.004

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…Introducing fluctuations will also be a step toward studying the effects of turbulence on solids suspension processes in mixing tanks. As is known from swirling flows, the Ekman vortex enhances turbulence levels and the entrainments of particles into the liquid …”

Section: Discussionmentioning

confidence: 99%

Suspending a solid sphere in laminar inertial liquid flow—experiments and simulations

Gao

Bao

et al. 2015

AIChE Journal

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The critical conditions for the suspension of single, spherical solid particles by a liquid flow in a square container driven by a rotating disk have been determined. In the experiments, the motion of the sphere has been visualized quantitatively. The conditions are such that the flow in the container is laminar (Reynolds numbers based on the rotating disk characteristics are in the range 10 -40). The Archimedes numbers of the spheres are of order 1. The suspension process has also been numerically simulated with full resolution of the liquid flow, including the flow around the sphere, and the translational and rotational motion of the sphere. The simulations recover the critical conditions to within 3% in terms of the rotational speed of the disk. Also the sphere's trajectory in the container is reproduced well by the simulations.

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Section: Discussionmentioning

confidence: 99%

Suspending a solid sphere in laminar inertial liquid flow—experiments and simulations

Gao

Bao

et al. 2015

AIChE Journal

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“…DNS consists on the full resolution of the turbulent flow field. The technique has been applied by Lavezzo et al (2009) to an unbaffled stirred vessel with Re = 1686 providing evidence of flow instabilities.…”

Section: Numerical Techniquesmentioning

confidence: 99%

Flow Instabilities in Mechanically Agitated Stirred Vessels

Galletti¹,

Brunazzi²

2011

Hydrodynamics - Advanced Topics

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“…The different behavior in the suspension of three sizes of heavy particles within a mixing vessel was recently simulated using Lagrangian particle tracking and direct numerical simulation of turbulence. 7 Experimental techniques which are effective in providing Lagrangian data in flow systems, however, are very limited. 8,9 A number of authors have shown that the analysis of Lagrangian data obtained from a single particle trajectory allows important mixing information to be obtained which is not measurable by Eulerian observations.…”

Section: Introductionmentioning

confidence: 99%

Lagrangian tools for the analysis of mixing in single‐phase and multiphase flow systems

2011

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Mixing is intrinsically a Lagrangian process and, while Eulerian data are very important, Lagrangian information is necessary for its complete description. Lagrangian data can, in principle, be generated by using numerical simulations or experimental techniques based on Lagrangian tracking to provide the trajectories of fluid elements or particles. We present a set of theoretical and computational tools specifically developed for the analysis and validation of single-phase and multiphase Lagrangian flow data obtained from tracer trajectories in mechanically agitated vessels. The implementation and power of these tools are demonstrated by analyzing a wide range of measurements acquired using the technique of positron emission particle tracking during mixing of Newtonian and non-Newtonian fluids as well as mixing of concentrated solid-liquid suspensions. Finally, the accuracy of the raw Lagrangian data treatment developed here is illustrated by comparing with an Eulerian technique and showing very precise mass continuity for an agitated solid-liquid system.

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Ekman pumping and intermittent particle resuspension in a stirred tank reactor

Cited by 9 publications

References 18 publications

Suspending a solid sphere in laminar inertial liquid flow—experiments and simulations

Suspending a solid sphere in laminar inertial liquid flow—experiments and simulations

Flow Instabilities in Mechanically Agitated Stirred Vessels

Lagrangian tools for the analysis of mixing in single‐phase and multiphase flow systems

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