On the experimental investigation of gas-liquid flow in bubble columns using ultrafast X-ray tomography and radioactive particle tracking

Azizi, Salar; Yadav, Ashutosh; Lau, Y.M.; Hampel, Uwe; Roy, Shantanu; Schubert, Markus

doi:10.1016/j.ces.2017.02.015

Cited by 42 publications

(15 citation statements)

References 34 publications

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“…Different non-intrusive and intrusive techniques have been proposed for measuring bubble shape and bubble size distribution [338][339][340][341][342][343][344][345][346][347][348][349]. Non-intrusive measurement techniques do not influence the fluid dynamics and for this reason, image analysis has attracted growing attention in recent years [350].…”

Section: The Bubble Size Distribution and Shapementioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: The Bubble Size Distribution and Shapementioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…The measurement height was adjusted to H c / D = 5 for both columns, which corresponds to 0.5 and 2 m above the sparger for the DN100 and DN400 column, respectively, which is located at well‐developed flow conditions. Previous studies confirmed a measurement error below 5 % .…”

Section: Methodsmentioning

confidence: 83%

Comparative Hydrodynamic Analysis of Narrow and Pilot‐Scale Bubble Columns with Internals

Möller

Kipping

Schleicher

et al. 2019

Chemie Ingenieur Technik

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For a stable operation of exothermic processes in bubble column reactors, an appropriate heat control is required, e.g., through dense internal tube bundle heat exchangers. Their impact on hydrodynamic characteristics and scaling approaches is studied for columns of different scales. Two different column dimensions (DN100 and DN400) were equipped with two common tube patterns of triangular and square pitches to study local fluid dynamics. Based on geometrical tube bundle scaling quantities, hydrodynamic similarity as a scale‐up criterion with respect to average holdups, phase distributions, and local gas structures can be reached.

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“…X-µCT is non-invasive and offers high spatial resolutions without requiring optical access [30,31]. Even though X-ray based computed tomography has already been successfully applied for the characterization of processes on a larger scale, among others [32][33][34][35][36][37], studies concerning its extension to the mini-or microscale are limited [31] and only very few studies concern the X-ray based investigation of mass transfer related problems [38][39][40]. Nonetheless, the proposed methodology offers great potential in gaining deeper knowledge about local radial mixing in HCTs, which is crucial for controlling reactions and their selectivity.…”

Section: Introductionmentioning

confidence: 99%

3D investigations of microscale mixing in helically coiled capillaries

2021

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In capillary reactors, improving radial mixing and narrowing the residence time distribution is of great importance for high selectivity and reaction performance. A well-known approach is inducing secondary flow patterns by coiling the capillary around a cylinder. To increase understanding of transport phenomena in helically coiled capillaries non-invasive 3D imaging approaches are required. In this perspective paper, we introduce X-ray-based micro-computed tomography for the investigation of dispersion of iodide in a helically coiled tube. The methodology presented here allows for the direct evaluation of radial concentration fields. By varying Dean number $$Dn$$ D n and modified torsion parameter $${T}^{*}$$ T ∗ , the effect of torsion and curvature on the radial concentration profile can be identified. Detailed knowledge of local radial mixing in helically coiled capillaries will help the precise prediction of reaction progress and selectivity. Graphical abstract

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On the experimental investigation of gas-liquid flow in bubble columns using ultrafast X-ray tomography and radioactive particle tracking

Cited by 42 publications

References 34 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

Comparative Hydrodynamic Analysis of Narrow and Pilot‐Scale Bubble Columns with Internals

3D investigations of microscale mixing in helically coiled capillaries

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