Potential of Lagrangian Analysis Methods in the Study of Chemical Reactors

Llamas, Cristina Garcia; Spille, Claas; Kastens, Sven; Paz, Daniel Garaboa; Schlüter, Michael; Kameke, Alexandra von

doi:10.1002/cite.201900147

Cited by 13 publications

(9 citation statements)

References 30 publications

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“…Llamas et al investigated POCS for the application of Lagrangian analysis techniques to gain new insights into reactor dynamics. This could be a valuable tool to identify and characterize areas with different mixing performance and to further optimize the geometry design . Most recently, Do et al.…”

Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucmentioning

confidence: 99%

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

et al. 2020

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In chemical process engineering, fast gas‐liquid reactions often suffer from an inefficient distribution of gas and therefore mixing and mass transfer performance. This study deals with the possibility of influencing the local gas holdup and bubble size distribution in a gas‐liquid process using additively manufactured lattice structures (AMLS). The used measuring technique to study bubble size, velocity, and the local gas holdup is a photo‐optical needle probe. By using AMLS, a significant radial homogenization of the local gas holdup and the mean bubble size is achieved. Furthermore, it can be demonstrated that the bubble size can be tailored by the geometry of the inserted structure. It is illustrated that the mean bubble velocities are lowered within the lattice resulting in a higher residence time of the dispersed phase with an impact on the mass transfer performance within the AMLS.

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Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucmentioning

confidence: 99%

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

et al. 2020

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“…where v is the characteristic velocity. Within this work, the characteristic velocity is set equal to the averaged velocity over the cross section v c that is needed to fix the bubble in the countercurrent flow 11, 12.…”

Section: Introductionmentioning

confidence: 99%

Taylor Bubble Study of the Influence of Fluid Dynamics on Yield and Selectivity in Fast Gas‐Liquid Reactions

Kexel

Kameke

Tenhaus

et al. 2021

Chemie Ingenieur Technik

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A consecutive competitive gas‐liquid reaction is investigated using a Taylor bubble setup regarding the influence of fluid mixing in the bubble wake on yield and selectivity. The concentration fields behind a Taylor bubble are visualized and measured quantitatively with a novel time‐resolved absorption imaging technique based on Beer Lamberts law and an integral selectivity is derived. In addition, the calculation of the local selectivity, often used in numerical approaches, is discussed and the existing experimental limits for its derivation are pointed out. Finally, an increase in selectivity of a competitive consecutive reaction for enhanced mixing is experimentally confirmed.

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“…The groups led by Freund and Schwieger have carried out studies on process intensification and, for example, improvement of liquid distribution in trickle-bed reactors [20,21], as well as reaction engineering design, use, and evaluation of these structures [15][16][17]22]. AMLS and, in particular, POCS are characterized by several advantages: Their use increases mass transfer while maintaining a comparatively small pressure drop (high energy efficiency) [28][29][30] and they also act as a static mixer [31]. Furthermore, POCS have a high surface-to-volume ratio and thus additionally enable a targeted use of heterogeneous catalysts or, in the case of a biochemical reaction, act as a carrier for immobilized enzymes [25].…”

Section: Introductionmentioning

confidence: 99%

Electrical Capacitance Volume Tomography (ECVT) for Characterization of Additively Manufactured Lattice Structures (AMLS) in Gas-Liquid Systems

Spille

Tholan

Straiton

et al. 2021

Fluids

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Against the background of current and future global challenges, such as climate change, process engineering requires increasingly specific solutions adapted to the respective problem or application, especially in gas–liquid contact apparatuses. One possibility to adjust the conditions in this kind of apparatuses is an intelligent and customized structuring, which leads to consistent fluid properties and flow characteristics within the reactor. In the course of this, the interfacial area for mass transfer, as well as residence times, have to be adjusted and optimized specifically for the respective application. In order to better understand and advance the research on intelligent customized additively manufactured lattice structures (AMLS), the phase distributions and local gas holdups that are essential for mass transfer are investigated for different structures and flow conditions. For the first time a tomographic measurement technique is used, the Electrical Capacitance Volume Tomography (ECVT), and validated with the volume expansion method and a fiber optical needle probe (A2PS-B-POP) for an air-water system for different modes of operation (with or without co-current liquid flow in empty or packed state). The ECVT proved to be particularly useful for both in the empty tube and the packed state and provided new insights into the phase distributions occurring within structured packings, which would have led to significantly underestimated results based on the visual reference measurements, especially for a densely packed additively manufactured lattice structure (5 mm cubic on the tip). Particularly for the modified structures, which were supposed to show local targeted differences, the ECVT was able to resolve the changes locally. The additional use of a pump for co-current flow operation resulted in slightly higher fluctuations within the ECVT data, although local events could still be resolved sufficiently. The final comparison of the empty tube at rest data with a fiber optical needle probe showed that the results were in good agreement and that the local deviations were due to general differences in the respective measurement techniques.

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Potential of Lagrangian Analysis Methods in the Study of Chemical Reactors

Cited by 13 publications

References 30 publications

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

Taylor Bubble Study of the Influence of Fluid Dynamics on Yield and Selectivity in Fast Gas‐Liquid Reactions

Electrical Capacitance Volume Tomography (ECVT) for Characterization of Additively Manufactured Lattice Structures (AMLS) in Gas-Liquid Systems

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