Noninvasive 4D Flow Characterization in a Stirred Tank via Phase‐Contrast Magnetic Resonance Imaging

Janiga, Gábor; Stucht, Daniel; Bordás, Róbert; Temmel, Erik; Seidel‐Morgenstern, Andreas; Thévenin, Dominique; Speck, Oliver

doi:10.1002/ceat.201700067

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…In physical experiments, many techniques, such as laser doppler velocimetry (LDV), particle image velocimetry (PIV), , double-tip conductivity probe, phase doppler velocimetry (PDA), magnetic resonance imaging (MRI), radioactive particle tracing (RPT), , electrical resistance tomography (ERT) , and positron emission particle tracking (PEPT), , were used to measure the velocity field and track the particle motion in the stirred tanks. They are all time- and cost-consuming, and the techniques used make it difficult to observe the microscopic phenomena.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Li,

Zhang,

et al. 2024

Ind. Eng. Chem. Res.

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Exploring the drawdown and dispersion behaviors of particles in stirred tanks can provide insights and valuable references for optimizing the design of equipment and improving the efficiency of the stirring process. In this article, the kinetic behaviors of drawdown and dispersion of floating particles in the stirred tank were simulated by the DEM-VOF (discrete element method−volume of fluid) model. The influences of impeller parameters (blade number n, rotation speed w, eccentric distance l, and off-bottom clearance h) on the granular characteristics (particle distribution, coupling force, total force, and translational/rotational kinetic energies), fluid dynamics (fluid velocity and turbulent kinetic energy), and gas−liquid free surface were investigated. The results show that the drawdown process of floating particles can be divided into the pull-down stage, dispersion stage, and cycle stage. With the increase in n, w, l, or h, the duration of the pull-down stage decreases, while the duration of the cycle stage increases. Due to the vortex effect and turbulent motion in the stirred tank, both the particle characteristics and flow dynamics change with the impeller parameters. Besides, large n or w, small l, and moderate h result in the deeper gas−liquid free surface.

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Section: Introductionmentioning

confidence: 99%

Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Li,

Zhang,

et al. 2024

Ind. Eng. Chem. Res.

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“…A proof of concept on how phase‐contrast MRI can be used to study the flow inside a stirred tank is demonstrated by Janiga et al. 27. The method is also known as 4D phase‐contrast MRI and is often used in medical applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Resonance Imaging for Non‐invasive Study of Hydrodynamics Inside Gas‐Liquid Taylor Flows

et al. 2021

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Multiphase flows are of major importance in today's industrial processes as many products originate from gas‐liquid reactions. The hydrodynamics within the wake behind the bubbles is essential as product selectivity is determined by the residence times in these mixing zones. Magnetic resonance imaging (MRI) offers a wide range of options for the investigation of multiphase flows. Here, non‐invasive MRI flow measurements of buoyancy‐driven N2 Taylor bubbles, spatially fixed inside a countercurrent flow of water, are performed. An experimental setup is presented, enabling the generation of Taylor bubbles inside a horizontal bore MRI scanner. Furthermore, a suitable MRI sequence allowing a time‐dependent analysis of the present flow field is described. The obtained MRI results are qualitatively compared to PIV images acquired in the same setup.

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“…Within the different solvent systems, the requirements vary significantly, e.g., coalescence in a decanter is intended in a phase separation step in micellar and thermomorphic solvent systems whereas it should be prevented in nanoparticle‐stabilized emulsions where droplets are separated from the bulk phase by ultrafiltration. The measurement techniques used to monitor the swarm behavior, reaction performance and system characteristics range from (cryogenic) scanning electron microscopy (SEM) , and endoscopes and phase contrast magnetic resonance imaging (PC‐NMR) to inductively coupled plasma optical emission spectroscopy (ICP‐OES) , .…”

Section: Introductionmentioning

confidence: 99%

Description of Disperse Multiphase Processes: Quo Vadis?

Hohl

Panckow

Schulz

et al. 2018

Chemie Ingenieur Technik

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The experimental accessibility of disperse systems often is a critical factor when it comes to the development of modeling approaches that intend to converge towards an exact solution. Often, integral or pseudo‐homogeneous values are used to reduce the complexity of the system, but a detailed single particle or interface analysis is crucial to understand relevant effects that also affect the swarm behavior. A high number of experimental techniques with respective limitations and advantages is available to quantify these effects. In this work, an overview on measurement techniques for momentum, heat and mass transfer in particle swarms as well as for the particle size distribution and interface characterization is provided. The industrial applicability is addressed by pointing out the vicinity to the process and the costs of different measurement techniques.

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Noninvasive 4D Flow Characterization in a Stirred Tank via Phase‐Contrast Magnetic Resonance Imaging

Cited by 5 publications

References 47 publications

Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Magnetic Resonance Imaging for Non‐invasive Study of Hydrodynamics Inside Gas‐Liquid Taylor Flows

Description of Disperse Multiphase Processes: Quo Vadis?

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