Visualization of gas–liquid mass transfer and wake structure of rising bubbles using pH-sensitive PLIF

Stöhr, Michael; Schanze, Julian Johannes; Khalili, Arzhang

doi:10.1007/s00348-009-0633-6

Cited by 46 publications

(33 citation statements)

References 17 publications

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“…For interfacial mass transfer measurements in gas-liquid applications, PLIF techniques with quenching, denamed PLIFI for PLIF techniques with Inhibition, have been developped. 20,23,[28][29][30][31] In the present case, the concentration of fluorescent dye is uniform in the liquid phase. The dye is chosen because its intensity of fluorescence is inhibited by the molecule which is transferred at the interface.…”

Section: Plif Technique With Quenchingmentioning

confidence: 80%

Experimental investigation of interfacial mass transfer mechanisms for a confined high‐reynolds‐number bubble rising in a thin gap

et al. 2016

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Interfacial mass transfer is known to be enhanced for confined bubbles due to the efficiency of the transfer in the thin liquid films between them and the wall. In the present experimental investigation, the mechanisms of gas–liquid mass transfer are studied for isolated bubbles rising at high Reynolds number in a thin gap. A planar laser induced fluorescence (PLIF) technique is applied with a dye the fluorescence of which is quenched by dissolved oxygen. The aim is to measure the interfacial mass fluxes for pure oxygen bubbles of various shapes and paths rising in water at rest. In the wakes of the bubbles, patterns due to the presence of dissolved oxygen are observed on PLIF images. They reveal the contrasted contributions to mass transfer of two different regions of the interface. The flow around a bubble consists of both two thin liquid films between the bubble and the walls of the cell and an external high‐Reynolds‐number in‐plane flow surrounding the bubble. Mass transfer mechanisms associated to both regions are discussed. Measurement of the concentration of dissolved oxygen is a difficult task due to the nonlinear relation between the fluorescence intensity and the concentration in the gap. It is however possible to accurately measure the global mass flux transferred through the bubble interface. It is determined from the fluorescence intensity recorded in the wakes when the oxygen distribution has been made homogeneous through the gap by diffusion. Assuming a reasonable distribution of oxygen concentration through the gap at short time also allows a measurement of the mass fluxes due to the liquid films. A discussion of the results points out the specific physics of mass transfer for bubbles confined between two plates as compared to bubbles free to move in unconfined flows. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2394–2408, 2017

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Section: Plif Technique With Quenchingmentioning

confidence: 80%

Experimental investigation of interfacial mass transfer mechanisms for a confined high‐reynolds‐number bubble rising in a thin gap

et al. 2016

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“…4d-f). Stöhr et al (2009) performed LIF-based experimental investigations with the CO 2 -water system and a bubble diameter of 1.1 mm, and they also reported a constant-length wake region 1.5d e long.…”

Section: Oxygen-water Systemmentioning

confidence: 97%

A CFD-based approach to the interfacial mass transfer at free gas–liquid interfaces

Ganguli

Kenig

2011

Chemical Engineering Science

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“…Optical drawbacks at a rising bubble (image taken from ); darker areas depict areas of high concentration.…”

Section: Lif At Curved Gas‐liquid Interfacesmentioning

confidence: 99%

Laser‐Induced Fluorescence in Multiphase Systems

et al. 2018

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Nowadays, multiphase flows occur in many different applications in everyday life or industrial context. Consequently, the understanding of transport phenomenolgy between the participating phases is a crucial task of recent and prospective research. When it comes to the optimization of absorption and chemical reaction tasks in process industry, in‐depth knowledge concerning mass transfer is required. The laser‐induced fluorescence (LIF) imaging is therefore a promising optical measurement technique to characterize concentration fields with high spatial and temporal resolution. This review gives an overview of the different fields of research within which LIF measurements are carried out, with focus on gas‐liquid systems. Chances and obstacles of recently publicated results as well as experiences of LIF methods regarding multiphase flows are presented and discussed.

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Visualization of gas–liquid mass transfer and wake structure of rising bubbles using pH-sensitive PLIF

Cited by 46 publications

References 17 publications

Experimental investigation of interfacial mass transfer mechanisms for a confined high‐reynolds‐number bubble rising in a thin gap

Experimental investigation of interfacial mass transfer mechanisms for a confined high‐reynolds‐number bubble rising in a thin gap

A CFD-based approach to the interfacial mass transfer at free gas–liquid interfaces

Laser‐Induced Fluorescence in Multiphase Systems

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