Determination of mixing time by colourimetric diagnosis?Application to a new mixing system

Delaplace, Guillaume; Bouvier, Laurent; Moreau, Anne; Guérin, Romuald; Leuliet, J. C.

doi:10.1007/s00348-003-0741-7

Cited by 44 publications

(35 citation statements)

References 12 publications

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“…Over the past decades, a lot of research on this subject has been published. Some of these works focused on the measurement technique and experiments [2][3][4][5] while others achieved empirical correlations from their experimental work [6,7]. A major emphasis was put on analyzing gas-liquid systems, either experimentally or numerically [8,9].…”

Section: Introductionmentioning

confidence: 99%

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Maaß¹,

Eppinger²,

Altwasser³

et al. 2011

Chem Eng & Technol

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Previous studies have shown the great potential, but also the great challenges, in handling slim reactors often used for polymerization reactions. Experiments and simulations were carried out in reactors with aspect-to-diameter ratios of up to 5, to test and to evaluate the mixing and dispersion efficiency for liquid-liquid systems of single-and multiple-stage impellers. Therefore, power consumption, mixing time and minimum dispersion speed were determined for five different stirrer types under turbulent conditions. It was found that the dimensionless mixing time is highly sensitive to the configuration of the impellers, with almost no dependency on the turbulent power number. Another focus was the analysis of the effect of the baffles. The influence of the baffle length in slim reactors on the mixing time and the macroscopic flow field was determined.

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Section: Introductionmentioning

confidence: 99%

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Maaß¹,

Eppinger²,

Altwasser³

et al. 2011

Chem Eng & Technol

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“…Since the detailed description of the experimental setup and method is available elsewhere [11], it is not repeated here. Suffice it to say that a batch of 30 liters of test fluid was stirred in a round bottom transparent vessel fitted with an Ekato Paravisc impeller.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

“…Some of these difficulties are circumvented in an indirect method recently reported by Delaplace et al [11] which has been shown to function with a high degree of reliability and robustness in highly viscous Newtonian systems, with different kind of mixing systems [11,12].This technique is based on the principle of video recording a fast acid-base indicator reaction in a transparent vessel and using an advanced image analysis technique for the determination of mixing times. In this study, this method is extended to non-Newtonian fluids to study the effect of rheological properties on mixing times.…”

Section: Introductionmentioning

confidence: 98%

Determination of Mixing Times with Helical Ribbon Impeller for Non‐Newtonian Viscous Fluids Using an Advanced Imaging Method

Chhabra

Bouvier²,

Delaplace³

et al. 2007

Chem Eng & Technol

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New results on mixing times for viscous Newtonian and non-Newtonian fluids being homogenized with a helical ribbon impeller are presented. In particular, a recently developed technique to determine the macromixing kinetics of an impeller in a transparent vessel was applied to investigate the effects of rheological properties on mixing times. Significant differences were observed in the mixing times for viscous Newtonian and non-Newtonian fluids. Based on the new data obtained in this work, a correlation incorporating the elastic effects is proposed in terms of a Weissenberg number for predicting the mixing time as a function of the Reynolds number and the system geometry.

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“…On one hand, the local methods rely on physical measurements using intrusive probes, such as thermal methods, conductimetric methods [7], pH-based methods, and so on. On the other hand, the global methods are based on either chemical reactions (e.g., redox and acid-base color change methods) [8] or optical tests like the Schlieren method.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies of the Flow Field in a Stirred Tank Equipped with Multiple Side‐Entering Agitators

2011

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The flow field and the macro-mixing process in a stirred tank equipped with four side-entering agitators were investigated experimentally and numerically. Experiments were conducted using two-dimensional particle image velocimetry (PIV) measurements to characterize the flow field at different positions in the vessel. The computational fluid dynamics (CFD) simulation was performed by the software Fluent 6.3, using the standard k-e turbulent model and the multiple reference frame together with the sliding mesh technique. The macro-mixing process was also discussed using CFD and decolorization experiments. The effects of the tracer detection positions and some mounting parameters in the mixing system were discussed. The results show that the mixing process was dominated by the flow field pattern in the stirred tank. According to the mixing times under different conditions using CFD simulation, the mounting parameters including inclination angle, plunging length and mounting height of the shaft were optimized.

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Determination of mixing time by colourimetric diagnosis?Application to a new mixing system

Cited by 44 publications

References 12 publications

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Determination of Mixing Times with Helical Ribbon Impeller for Non‐Newtonian Viscous Fluids Using an Advanced Imaging Method

Experimental and Numerical Studies of the Flow Field in a Stirred Tank Equipped with Multiple Side‐Entering Agitators

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