Local Measurement of Mass Transfer Rate of a Single Bubble with and without a Chemical Reaction

Kück, Ulf Daniel; Schlüter, Michael; Räbiger, Norbert

doi:10.1252/jcej.12we059

Cited by 25 publications

(20 citation statements)

References 6 publications

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“…Here, the reaction rate is higher than the mass transfer rate, and the oxygen reacts very close to the boundary layer so that no dissolved oxygen is visible. The results are in good agreement with Kück et al [17] for spherical bubbles.…”

Section: Local Mass Transfer Enhancementsupporting

confidence: 92%

“…To investigate the local mass transfer, a planar laser-induced fluorescence (LIF) technique is used to visualize oxygen concentration fields. Therefore, dichlorotris(1,10-phenanthroline)ruthenium(II)-hydrate (c = 30 mg L -1 ; Sigma-Aldrich) is used as a fluorescent dye according to the experiments of Kück et al [17]. This dye shows a decrease in fluorescence intensity as a function of oxygen concentration, which can be described with the Stern-Volmer correlation [18].…”

Section: Local Mass Transfer Measurementsmentioning

confidence: 99%

“…While the overall reaction is simple, the reaction mechanism is very complex due to radical reactions [18] and is not clarified in all details yet [20,21]. But the reaction is commonly used to determine the volumetric mass transfer coefficient and has proven to be controllable in the reaction rate to adjust the time scales of the reaction on the time scales of bubble rise and mixing [17]. Therefore, this reaction is applied within this work only for a first investigation on the influence of bubble bouncing on chemical reactions.…”

Section: Local Mass Transfer Measurementsmentioning

confidence: 99%

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Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction

2016

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The hydrodynamics of bubbly flows is dominated by bubble-induced turbulence and bubble-bubble interactions. Both phenomena influence the gas-liquid mass transfer as well as the mixing of reactants. If the time scales of mass transfer and mixing are in the same order as the time scales of a parallel-consecutive reaction, the yield and selectivity will be affected by the local hydrodynamics. An experimental setup is presented that enables the investigation of mass transfer during well-defined and adjustable bubble collisions. The influence of CO 2 bubble collisions on mass transfer is measured and modeled with a modified Sherwood number correlation. Further visualization of the concentration field in the vicinity of O 2 bubbles by means of laser-induced fluorescence demonstrates the dependency of mass transfer from a chemical reaction and permits the development of a first model approach.

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Section: Local Mass Transfer Enhancementsupporting

confidence: 92%

Section: Local Mass Transfer Measurementsmentioning

confidence: 99%

Section: Local Mass Transfer Measurementsmentioning

confidence: 99%

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Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction

2016

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“…The resulting PLIF image sequences revealed the evolution of characteristic patterns in the near and far wake of the bubbles and further allowed the estimation of bubble size and rise velocity. Kück et al [30,34] [13,37,38] discussed the influences of gas-liquid interface contamination on the bubble motions, bubble wake patterns, and the mass transfer process, through the reconstruction of three-dimensional bubble wakes in purified water and contaminated water. Timmermann et al [39] investigated the influence of bubble collisions on the local concentration field at well-defined conditions and that of a superimposed sodium sulfite reaction on the concentration field after bouncing.…”

Section: Application Of the Visualization Techniques To Gas-liquid Systemsmentioning

confidence: 99%

Comparison of three different techniques for gas-liquid mass transfer visualization

Hébrard

Dietrich

2020

International Journal of Heat and Mass Transfer

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In this article three different techniques for visualizing gas-liquid mass transfer are reviewed according to their applications in air-water systems. The three techniques are: Planar Laser Induced Fluorescence (PLIF with the use of fluorescent resorufin), PLIF with Inhibition (PLIF-I with the use of a ruthenium complex), and a colorimetric technique (using a redox reaction with the pink-colored dye resorufin).For comparison purpose, the three techniques were conducted in the same experimental set-up to characterize the local oxygen mass transfer from a single air bubble (with equivalent diameter ~1 mm) rising in water. This paper rigorously compares these three techniques and aims to point out their advantages and limitations. The comparison was divided into two parts: the visualization and the quantification of the mass transfer. The discussion focused on the image quality, the required equipment, and the accuracy of the quantification results including the mass flux, the diffusion coefficient and the mass transfer coefficient. A guideline was provided for choosing the technique that most accurately visualizes and characterizes the local mass transfer in gas-liquid systems.

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“…To get a holistic view of the processes within the microchannel, it is of great interest to monitor the concentration profiles within the microchannel. These measurements are often done by laser-induced fluorescence, which is a very sensitive tool [8,9]. However, it is limited to applications with fluorescent species.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Raman Spectroscopic and Holographic System for Gas‐Liquid Flows in Microchannels

et al. 2017

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The description and prediction of the highly transient processes on the molecular scale in gas-liquid Taylor flows in microchannels are a great challenge. Due to a lack of in situ measurement techniques with satisfactory spatial and temporal resolution, existing models and numerical simulations of reactive two-phase flows are poorly developed. The Raman spectroscopic and holographic system presented herein overcomes shortcomings regarding the high temporal resolution and concomitant difficulties with the high energy densities that must be coupled into microstructured devices to give good limits of detection. It gives insight into the concentration profiles in the liquid phase within the microchannel to study the interaction between hydrodynamics, mass transport, and reaction kinetics.

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Local Measurement of Mass Transfer Rate of a Single Bubble with and without a Chemical Reaction

Cited by 25 publications

References 6 publications

Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction

Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction

Comparison of three different techniques for gas-liquid mass transfer visualization

Characterization of a Raman Spectroscopic and Holographic System for Gas‐Liquid Flows in Microchannels

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