Advanced analysis of liquid dispersion and gas–liquid mass transfer in a bubble column with dense vertical internals

Möller, Felix; MacIsaac, Alan; Lau, Y.M.; Schleicher, Eckhard; Hampel, Uwe; Schubert, Markus

doi:10.1016/j.cherd.2018.04.018

Cited by 11 publications

(14 citation statements)

References 34 publications

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“…This way, gas can be distinguished from the liquid to study the gas‐liquid flow morphology. Moreover, conductivity tracers can be added to study liquid mixing , . The spatial resolution of WMSs depends on the application and is usually in the range of 3 – 5 · 10 −3 m for pipe flows and 5 – 10 · 10 −3 m for larger bubble columns.…”

Section: Methodsmentioning

confidence: 83%

“…Reconstruction algorithms, e.g., filtered back projection, to obtain images with a spatial resolution of roughly 0.5 · 10 −3 m and post‐processing steps, e.g., normalizing, referencing, and thresholding, are required to extract hydrodynamic parameters. Details about the imaging technique and the post‐processing can be found elsewhere , , . 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.…”

Section: Methodsmentioning

confidence: 99%

“…5 % and below has hardly any effect , values larger than 20 % have a significant influence on the hydrodynamics. Compared to empty columns, the average gas holdup in columns with internals is increasing due to smaller and slower rising bubbles as a result of the prevailing breakup bubble formation mechanism , , . Tracer experiments have shown that internals also favor larger liquid circulation cells and suppress radial spreading and dispersion .…”

Section: Introductionmentioning

confidence: 99%

“…Compared to empty columns, the average gas holdup in columns with internals is increasing due to smaller and slower rising bubbles as a result of the prevailing breakup bubble formation mechanism , , . Tracer experiments have shown that internals also favor larger liquid circulation cells and suppress radial spreading and dispersion . Recent studies in a narrow column revealed that internals favor asymmetric flow patterns , while comparable analyses at pilot‐scale are not yet available.…”

Section: Introductionmentioning

confidence: 99%

“…Tracer experiments have shown that internals also favor larger liquid circulation cells and suppress radial spreading and dispersion . Recent studies in a narrow column revealed that internals favor asymmetric flow patterns , while comparable analyses at pilot‐scale are not yet available.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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Section: Methodsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Möller

Kipping

Schleicher

et al. 2019

Chemie Ingenieur Technik

Self Cite

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Prediction of intensity of dispersion in surfactant solutions in vertical sparged bubble column

Parmar

2022

Asia-Pacific J Chem Eng

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Dispersion of liquid in bubble column is an important process in chemical and allied industries. In the present work, the dispersion characteristics of liquid phase in a bubble column is studied in three different surfactant solutions. A comparative analysis on the dispersion characteristics of liquid phase in different surfactants has been carried out. The gas holdup and mixing time are also analysed. The effect of different physiochemical properties and operating variables on the dispersion coefficient and gas holdup is examined. A novel model for the estimation of dispersion due to bubble motion has been developed which incorporates the effect of gas holdup, liquid viscosity and circulation velocity. The contribution of dispersion coefficient due to the bubble motion in overall dispersion is also examined. The value of velocity distribution parameter in three different surfactant solutions is also compared. Generalised correlations for gas holdup, dispersion coefficient and mixing time are also developed based on the physicochemical properties of liquid. This research may be useful for the selection and application of these three surfactants in industries. This article will also help researchers for designing multiphase flow system where role of dispersion due to the motion of bubbles is significant.

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Liquid and solids phase backmixing in a bubble and slurry bubble column using a virtual tracer response methodology based on the trajectory data of the radioactive particle tracking (RPT) technique

2021

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Virtual tracer response methodology developed based on the trajectory data of the computer aided radioactive particle tracking (CARPT) technique was demonstrated. The demonstrated virtual tracer technique has advantages of non‐invasiveness, near perfect injection/sampling, and flexibility in choosing the sampling/injection boundaries in a specific spatial pattern. With the developed virtual tracer technique, liquid and solids backmixing were investigated at the conditions mimicking Fischer‐Tropsch synthesis. Experiments were conducted at different pressure, solids loading, and superficial gas velocity. The axial dispersion model (ADM) and recirculation and cross flow dispersion (RCFD) models were used to model the liquid mixing. Transient sedimentation dispersion model (SDM) was used to model the solids mixing. It was found that the measured axial dispersion coefficient (Dl) in the ADM model increases with increase in the pressure. The increase of dispersion coefficient was explained with the experimental values of mean axial diffusivity and mean recirculation velocity. Axial dispersion coefficients (Dz,uDz,d) in the RCFD model (compartment model) were apparently lower than the Dl, due to the decoupling of global recirculation from the dispersion coefficients in the RCFD. Further, it was found that the dispersion coefficients in the RCFD model follow the trend of the axial eddy diffusivity with change in the operating conditions revealing the dominance of the turbulence in the upflow and downflow compartments. From the solids backmixing study, axial dispersion coefficient (Ds) of solids was found to increase with increase in the solids loading, pressure, and superficial gas velocity at the studied conditions.

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Advanced analysis of liquid dispersion and gas–liquid mass transfer in a bubble column with dense vertical internals

Cited by 11 publications

References 34 publications

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

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

Prediction of intensity of dispersion in surfactant solutions in vertical sparged bubble column

Liquid and solids phase backmixing in a bubble and slurry bubble column using a virtual tracer response methodology based on the trajectory data of the radioactive particle tracking (RPT) technique

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