Concentration measurement in the wake of a free rising bubble using planar laser-induced fluorescence (PLIF) with a calibration taking into account fluorescence extinction variations

Valiorgue, Pierre; Souzy, Nicolas; Hajem, Mahmoud El; Hadid, H. Ben; Simoëns, Serge

doi:10.1007/s00348-013-1501-y

Cited by 28 publications

(29 citation statements)

References 21 publications

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“…Thus, in this region, we observe a Stern-Volmer-type relationship [11,14] that is typically applied to describe fluorescence quenching by oxygen [7,10]. On the other hand, for lower values of pH, G is observed to change fairly linearly with pH, a result that was reported by Asher and Litchendorf [9] for a similar range in pH.…”

Section: Intensity Concentration and Ph Profilessupporting

confidence: 65%

“…Such is the case of sodium fluorescein, whose emission intensity increases nonlinearly with pH in the range ∼3−9 [17]. pH-sensitive LIF is a useful method to quantify CO 2 absorption in liquids [9,14], and it can be likewise employed as a means to accurately measure the diffusivity of CO 2 in water [18]. In a recent work, Vreme et al [19] made use of it to visualize the gravitational (convective) instability triggered by the dissolution of carbon dioxide through a water-gas interface in a vertical Hele-Shaw cell.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of dissolved CO2 in water propagating from a cylindrical bubble in a horizontal Hele-Shaw cell

et al. 2017

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The dissolution of a gas bubble in a confined geometry is a problem of interest in technological applications such as microfluidics or carbon sequestration, as well as in many natural flows of interest in geophysics. While the dissolution of spherical or sessile bubbles has received considerable attention in the literature, the case of a two-dimensional bubble in a Hele-Shaw cell, which constitutes perhaps the simplest possible confined configuration, has been comparatively less studied. Here, we use planar laser-induced fluorescence to experimentally investigate the diffusion-driven transport of dissolved CO 2 that propagates from a cylindrical mm-sized bubble in air-saturated water confined in a horizontal Hele-Shaw cell. We observe that the radial trajectory of an isoconcentration front, r f (t), evolves in time as approximately r f − R 0 ∝ √ t,where R 0 denotes the initial bubble radius. We then characterize the unsteady CO 2 concentration field via two simple analytical models, which are then validated against a numerical simulation. The first model treats the bubble as an instantaneous line source of CO 2 , whereas the second assumes a constant interfacial concentration. Finally, we provide an analogous Epstein-Plesset equation with the intent of predicting the dissolution rate of a cylindrical bubble.

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Section: Intensity Concentration and Ph Profilessupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Diffusion of dissolved CO2 in water propagating from a cylindrical bubble in a horizontal Hele-Shaw cell

et al. 2017

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“…The principle of BPLIF using fluorescein sodium as a fluorescent dye has been developed by Valiorgue et al [1,45] and is briefly summarized below.…”

Section: Concentration Fields Is a Variant Of Planar Laser Induced Flmentioning

confidence: 99%

“…The operations necessary to measure dissolved carbon dioxide fields are the following: 1. record fluorescence intensity field and apply correction taking into account non homogeneous excitation light intensity, and variations of extinction coefficient [45,46]; 2. convert intensity field to pH field using previously established calibration curves similar to the one shown in Figure 6; 3. convert pH field to [CO 2 ] aq field using either theoretical solving of acid-base equilibria (Eqs. [19][20][21] as done in Figure 7, or an experimental [CO 2 ] aq = f(pH) calibration curve previously established.…”

Section: Concentration Fields Is a Variant Of Planar Laser Induced Flmentioning

confidence: 99%

Study of Gas Liquid Mass Transfer in a Grid Stirred Tank

Lacassagne

Hajem

Morge

et al. 2017

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-Dissolution and mass transfer at gas liquid interfaces are central to many industrial and environmental issues. All these applications aim at predicting the transfer velocities between the two phases, and the dependency of these velocities on several factors such as pressure, temperature, flow regime and so on. The goal of the present study is to understand the physical phenomena acting in the liquid phase during the dissolution and transfer of a gas at a flat two-phase interface; and to measure the influence of these phenomena on mass exchanges. To that end, an oscillating grid apparatus is used to generate a controlled liquid side turbulence. The dissolution of an atmospheric sparingly soluble gas, carbon dioxide, is considered. Optical measurement techniques are used simultaneously in order to gain further insight on the hydrodynamics influence on dissolved gas mixing. The phenomena responsible for mass transfer acceleration are found to happen in thin characteristic depth scales under the interface. In those regions, a complex combination of dissolved gas injection and diffusion layers renewing events is observed. The analysis of velocity fields highlights their strongly three dimensional aspects, and simultaneous measurements, lead to the conclusion that these three-dimensional effects have an impact on dissolved scalar concentration structures, and consequently on mass transfer.Résumé -Étude du transfert de masse gas-liquide dans une cuve agitée par grille oscillanteLa dissolution et le transfert de masse au niveau des interfaces gaz-liquide sont au coeur de nombreuses problématiques tant industrielles qu'environnementales. Toutes ces applications nécessitent de prédire les vitesses d'échanges de matière entre les deux phases, et la dépendance de ces vitesses d'échanges aux différentes conditions de température, pression, écoulement, etc. L'objectif de la présente étude est de comprendre les phénomènes physiques intervenant en phase liquide lors de la dissolution et du transfert d'un gaz au niveau d'une interface diphasique plane, et de quantifier l'influence de ces phénomènes sur les échanges de masse. Pour ce faire, un dispositif de grille oscillante permettant de générer une turbulence contrôlée coté liquide est utilisé. La dissolution d'un gaz atmosphérique faiblement soluble dans l'eau, à savoir le dioxyde de carbone, est considérée. Des techniques de diagnostic optique faiblement intrusives sont employées de manière simultanée pour pouvoir étudier directement l'influence de l'hydrodynamique sur le mélange du gaz. Il est observé que l'essentiel des phénomènes déterminant la vitesse de transfert de masse a lieu dans des sous-couches caractéristiques de très faible épaisseur sous l'interface. Dans ces régions, un ensemble complexe d'évènements d'injection de gaz dissout et de renouvellement des zones de diffusion est observé. L'analyse des champs de vitesse met en évidence leur caractère fortement tridimensionnel et les mesures couplées permettent de constater que ces effets tridimensionnels o...

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“…The authors of [19] deal with these challenges and propose a calibration technique. Furthermore, the extinction coefficient can vary with concentration, which can be taken into account using the technique introduced by Valiorgue et al [96]. It is worth noting that despite the calibration techniques mentioned, the experimental and image processing effort remains very high, especially if various drawbacks should be compensated by calibration techniques at the same time.…”

Section: Challenges Regarding Fluorescent Dyesmentioning

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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Concentration measurement in the wake of a free rising bubble using planar laser-induced fluorescence (PLIF) with a calibration taking into account fluorescence extinction variations

Cited by 28 publications

References 21 publications

Diffusion of dissolved CO2 in water propagating from a cylindrical bubble in a horizontal Hele-Shaw cell

Diffusion of dissolved CO2 in water propagating from a cylindrical bubble in a horizontal Hele-Shaw cell

Study of Gas Liquid Mass Transfer in a Grid Stirred Tank

Laser‐Induced Fluorescence in Multiphase Systems

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