Experimental and Modelling Studies With Mixers for Potential Use With Fast Polymerisations in Tubular Reactors

Murphy, S.; Meszena, Z. G.; Johnson, A. F.

doi:10.1081/pre-100107508

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…The measurement field of the mixing zone is 40 mm × 6 mm. The size of a pixel is equal to 100 µm, and the total measured volume represented by one pixel is thus 0.1 × 0.1 × 0.5 mm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…In particular, fluid mixing becomes more crucial in chemical processes where fast, multiple parallel competing reactions or consecutive competing reactions occur in either a single-phase flow or a multiphase flow (see review article). In other cases, where nanoparticles or fine-quality polymers are prepared from the instantaneous precipitation of liquid reactants, the size distribution of the nanoparticles or molecular weight distribution of polymer molecules are greatly affected by the mixing efficiency. , Although the applications mentioned above are rather diversified, there is a common demand for fast liquid mixing, that is, to match the reaction time scale at milliseconds or even lower and the mixing homogeneity in space as well. Thus, it is essential to master the design of efficient mixing equipment to reduce the segregation of the reactants at the molecular scale during the initial mixing.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Mixing Behavior of Thin Liquid-Sheet Impinging Jets Using the PLIF Technique

Luo

Cheng

Wang

et al. 2005

Ind. Eng. Chem. Res.

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A thin liquid-sheet impinging jet is proposed for the application of fast liquid mixing with low viscosity and studied experimentally using the nonintrusive planar laser-induced fluorescence (PLIF) technique. The design of the jet consists of two separate liquid sheets flowing in each channel of 2-mm thickness, which impinge on each other at an impingement angle of 30° or 45° with a free mixing zone or a restricted zone. The mixing process is visualized by the PLIF technique with the addition of Rhodamine B as the dye, where the concentration distribution of the traced liquid sheet is represented by the received fluorescent light strength. The results are characterized quantitatively by contours of the mean concentration, deviations of the concentration fluctuations, the intensity of segregation (IOS), and the 95% mixing time (τ95). It is found that the mixing efficiency of a jet with a restricted impingement zone is remarkably higher than that of a jet with a free impingement zone; a larger impingement angle between the two liquid sheets and a larger velocity ratio of the outer liquid sheet to the inner one promote the mixing performance characterized by more homogeneous mixing at shorter times.

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“…The measurement field of the mixing zone is 40 mm × 6 mm. The size of a pixel is equal to 100 µm, and the total measured volume represented by one pixel is thus 0.1 × 0.1 × 0.5 mm 3 .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Mixing Behavior of Thin Liquid-Sheet Impinging Jets Using the PLIF Technique

Luo

Cheng

Wang

et al. 2005

Ind. Eng. Chem. Res.

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“…Anionic polymerization is one of the three most important polymerizations and has an key function in producing thermoplastic rubber 13. In addition, currently available experimental data on anionic polymerization are limited because of sensitivity to traces of impurities, such as water, alcohol, and oxygen 19, 20. Therefore, a case study based on the new CFD model was conducted to optimize macroscale parameters and polymer microstructure distributions in a styrene anionic polymerization tubular reactor.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of Multiscale Mixing in Anionic Polymerization Tubular Reactors

2016

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The molecular properties of polymers are greatly influenced by operation parameters during polymerization in reactors. Since operation parameter distributions in reactors also result in molecular property distributions, polymerization bridges the gap between molecular properties and operation parameters. The combination of the computational fluid dynamics technology with the method of moments to form a uniquely coupled model was used to describe multiscale mixing fields in the reactor. The coupled model was validated by open experimental data, and the effects of polymerization kinetics on macroscopic and microscopic fields were investigated numerically. Also, the coupled model was applied to numerically predict the impacts of some key operation conditions on the main macroscopic flow field parameters and polymer molecular properties.

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Free‐Radical Polymerization: Homogeneous Systems

Hutchinson¹,

Penlidis²

2007

Polymer Reaction Engineering

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Experimental and Modelling Studies With Mixers for Potential Use With Fast Polymerisations in Tubular Reactors

Cited by 4 publications

References 27 publications

Study on the Mixing Behavior of Thin Liquid-Sheet Impinging Jets Using the PLIF Technique

Study on the Mixing Behavior of Thin Liquid-Sheet Impinging Jets Using the PLIF Technique

Computational Fluid Dynamics Simulation of Multiscale Mixing in Anionic Polymerization Tubular Reactors

Free‐Radical Polymerization: Homogeneous Systems

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