Dual emission LIF technique for pH and concentration field measurement around a rising bubble

Kong, Gaopan; Buist, KA Kay; Peters, E.A.J.F.; Kuipers, J.A.M.

doi:10.1016/j.expthermflusci.2017.12.032

Cited by 29 publications

(17 citation statements)

References 28 publications

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“…A calibration plate with known size and distance was used to convert pixel distances to mm. On the plate, the center distance of two horizontal/vertical neighboring white dots is 5 mm and the size of the dots is 1.2 mm (Kong et al 2018). The spatial resolution is high enough to capture the bubble interface without the help of any interpolative reconstruction.…”

Section: Measurement and Image Processing Techniquesmentioning

confidence: 99%

Oscillation dynamics of a bubble rising in viscous liquid

et al. 2019

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In the present work, we study the oscillation dynamics of 3 mm-diameter bubbles generated through an orifice submerged in viscous liquids. The viscosity of those liquids is varied to change the behavior of the rising bubble. The details of the rising motion and shape oscillation of the bubbles are measured using a combination of high speed, high-resolution imaging, and an accurate digital image processing technique. Direct Numerical Simulations that mimic the experimental conditions are also performed using a front-tracking technique, called the Local Front Reconstruction Method. The predictions of the bubble shape and rising velocity obtained by the numerical simulations show good agreement with the experimental results. Our experimental and numerical results show that the oscillation frequency and the damping rate at lower modes can be predicted using available theoretical models found in the literature. However, discrepancies arise between our results with the theoretical predictions at higher order oscillation modes. We conclude that the discrepancies are due to the influence of rising motion and the vortex wave, which is not considered in the theoretical models.

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Section: Measurement and Image Processing Techniquesmentioning

confidence: 99%

Oscillation dynamics of a bubble rising in viscous liquid

et al. 2019

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“…In a recent study by Kong et al. , single rising bubbles are investigated using a dual‐emission technique. This technique benefits from the use of only one dye which has two distinct wavelength bands which act as a reference for each other.…”

Section: Lif At Curved Gas‐liquid Interfacesmentioning

confidence: 99%

“…They were able to describe the bubble wakes in detail and the calculated local mass transfer coefficients in the wake (by observing the instantaneous decrease of the bubble volume) which they compared to the bubble trajectory. In a recent study by Kong et al [37], single rising bubbles are investigated using a dual-emission technique. This technique benefits from the use of only one dye which has two distinct wavelength bands which act as a reference for each other.…”

Section: Freely Rising Bubblesmentioning

confidence: 99%

“…In this case, the Stern‐Volmer plots are no longer linear . Recently, Kong and co‐workers proposed a calibration technique with only one fluorescent dye with two distinct wavelength bands. This can be a promising technique, since the system is less disturbed by the addition of fluorescend dyes, and the over‐all concentration of fluorescent dyes is lower.…”

Section: Calibrationmentioning

confidence: 99%

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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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“…In the shown study CO 2 and water were used as first test system, followed by the chemical system of Fe/NO (see section 4). Recently, Kong et al introduced a more advanced dual emission LIF technique to further increase the obtained data on the mass transfer process in bubbly flows …”

Section: Systems With Co2mentioning

confidence: 99%

Reaction Systems for Bubbly Flows

et al. 2018

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Reactive bubbly flows are at the heart of multiphase flows which are a major topic in chemical engineering since many bulk chemicals are produced in bubbly flows. However, the factors determining product yield and selectivity are often subject of complicated mass transfer effects. Herein, we describe the latest developments in the detection of mass transfer [a] is holding a permanent position in the Herres-Pawlis group at RWTH Aachen University for advanced spectroscopy, density functional calculations and X-ray crystallography. He studied Chemistry at the University of Paderborn and finished his PhD thesis at TU Dortmund in 2011 on the coordination chemistry of late transition metals for catalysis and bioinorganic chemistry. Then, he moved to LMU Munich and turned to the theoretical description of N-donor transition metal systems with focus on copper-dioxygen chemistry. In 2013, he was awarded with the Römer-Postdoc Prize.

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Dual emission LIF technique for pH and concentration field measurement around a rising bubble

Cited by 29 publications

References 28 publications

Oscillation dynamics of a bubble rising in viscous liquid

Oscillation dynamics of a bubble rising in viscous liquid

Laser‐Induced Fluorescence in Multiphase Systems

Reaction Systems for Bubbly Flows

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