Estimation of mass transfer velocity based on measured turbulence parameters

Janzen, Johannes Gérson; Herlina, Herlina; Jirka, Gerhard H.; Schulz, Harry Edmar; Gulliver, John S.

doi:10.1002/aic.12123

Cited by 35 publications

(53 citation statements)

References 41 publications

(56 reference statements)

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“…Back to vertical phenomenon considerations, it has been observed by Herlina and Jirka [5,8] and Janzen et al [10], and confirmed by Variano and Cowen [6,12] that surface renewal is not the only mechanism responsible for turbulent mass transfer.…”

Section: Mass Transfer Modelsmentioning

confidence: 85%

“…This smaller scale convection like phenomena, also called "injection" events, were found to be not only observable [10,16] but also quantitatively non negligible in the total mass flux exchanged [12]. Mass transfer seems therefore to be enhanced by a combination of injection and renewal events at different scales.…”

Section: Mass Transfer Modelsmentioning

confidence: 99%

“…The first observation that can be made is that the presence of the interface tends to deform the upcoming turbulent structures by reducing their vertical dimension and increasing their horizontal scales [10,12], as schemed on Figure 1. This implies that the bulk turbulence is different from the one impinging on the diffusion layers at the interface.…”

Section: Subsurface Hydrodynamicsmentioning

confidence: 99%

“…in each phase 1 . Several investigations have been made using numerical simulations, channel flows, or stirred tank experiments to study the influence of these parameters [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Mass Transfer Modelsmentioning

confidence: 85%

Section: Mass Transfer Modelsmentioning

confidence: 99%

Section: Subsurface Hydrodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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“…This simultaneous measurement was extensively used to investigate the mixing processes [17] [18] [19]. Figure 3 shows the measurement section of simultaneous PIV and PLIF measurement.…”

Section: Methodsmentioning

confidence: 99%

Diffusion Process of High Concentration Spikes in a Quasi-Homogeneous Turbulent Flow

Endo¹,

Shao²,

Tsukahara³

et al. 2016

OJFD

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When a mass spreads in a turbulent flow, areas with obviously high concentration of the mass compared with surrounding areas are formed by organized structures of turbulence. In this study, we extract the high concentration areas and investigate their diffusion process. For this purpose, a combination of Planar Laser Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV) techniques was employed to obtain simultaneously the two fields of the concentration of injected dye and of the velocity in a water turbulent channel flow. With focusing on a quasi-homogeneous turbulence in the channel central region, a series of PLIF and PIV images were acquired at several different downstream positions. We applied a conditional sampling technique to the PLIF images to extract the high concentration areas, or spikes, and calculated the conditional-averaged statistics of the extracted areas such as length scale, mean concentration, and turbulent diffusion coefficient. We found that the averaged length scale was constant with downstream distance from the diffusion source and was smaller than integral scale of the turbulent eddies. The spanwise distribution of the mean concentration was basically Gaussian, and the spanwise width of the spikes increased linearly with downstream distance from the diffusion source. Moreover, the turbulent diffusion coefficient was found to increase in proportion to the spanwise distance from the source. These results reveal aspects different from those of regular mass diffusion and let us conclude that the diffusion process of the spikes differs from that of regular mass diffusion.

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Characteristic time scales for predicting the scalar flux at a free surface in turbulent open‐channel flows

Nagaosa

Handler

2012

AIChE Journal

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The purpose of this study is to predict the turbulent scalar flux at a free surface subject to a fully developed turbulent flow based on a hydrodynamic analysis of turbulence in the region close to the free surface. The effect of the Reynolds number on turbulent scalar transfer mechanisms is extensively examined. A direct numerical simulation technique is applied to achieve the purpose. The surface‐renewal approximation is used to correlate the free‐surface hydrodynamics and scalar transport at the free surface. Two types of characteristic time scales have been examined for predicting turbulent scalar flux. One is the time scale derived from the characteristic length and velocity scale at the free surface. The other is the reciprocal of the root‐mean‐square surface divergence. The results of this study show that scalar transport at the free surface can be predicted successfully using these time scales based on the concept of the surface‐renewal approximation. © 2012 American Institute of Chemical Engineers AIChE J, 2012

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Estimation of mass transfer velocity based on measured turbulence parameters

Cited by 35 publications

References 41 publications

Study of Gas Liquid Mass Transfer in a Grid Stirred Tank

Study of Gas Liquid Mass Transfer in a Grid Stirred Tank

Diffusion Process of High Concentration Spikes in a Quasi-Homogeneous Turbulent Flow

Characteristic time scales for predicting the scalar flux at a free surface in turbulent open‐channel flows

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