Analyse des grenzschichtnahen Stofftransports an frei aufsteigenden Gasblasen

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

doi:10.1002/cite.200900034

Cited by 18 publications

(18 citation statements)

References 3 publications

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“…Because of the large bubble volume, its shape changes significantly with time, and this, in turn, influences the concentration distribution of oxygen. Once again, the simulation results are qualitatively in line with the experiments of Kück et al (2009). Thus, on the overall, this first testing can be considered as satisfactory for both cases studied.…”

Section: Oxygen-water/cmc Systemsupporting

confidence: 81%

“…They were compared with the experimental images obtained by Kück et al (2009) using laser induced fluorescence (LIF). Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Both bubbles contained 99% oxygen and 1% nitrogen. Similar systems were studied experimentally by Kück et al (2009). Regarding that our study was focused on the method feasibility, we used a simplified treatment of the water-CMC solution neglecting its non-Newtonian properties.…”

Section: Model Implementationmentioning

confidence: 99%

“…Viscosity values were taken as 2.03 Â 10 À 5 kg/(m s) for oxygen (Perry, 2008), 1.0 Â 10 À 3 kg/(m s) for water and 2.5 Â 10 À 2 kg/(m s) for CMC/water-mixture (Kück et al, 2009). The correspondent densities are 1.314, 1000 and 1000 kg/m 3 .…”

Section: Physical Propertiesmentioning

confidence: 99%

“…The diffusion coefficients are 1.91 Â 10 À 5 m 2 /s (oxygen-nitrogen), 2.01 Â 10 À 9 m 2 /s (oxygenwater) and 1.47 Â 10 À 9 m 2 /s (oxygen-CMC/water). They are taken from Bothe et al (2003) and Kück et al (2009). The surface tension is taken for both cases as 0.072 N/m (Perry, 2008).…”

Section: Physical Propertiesmentioning

confidence: 99%

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

Ganguli

Kenig

2011

Chemical Engineering Science

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Section: Oxygen-water/cmc Systemsupporting

confidence: 81%

“…They were compared with the experimental images obtained by Kück et al (2009) using laser induced fluorescence (LIF). Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Model Implementationmentioning

confidence: 99%

Section: Physical Propertiesmentioning

confidence: 99%

Section: Physical Propertiesmentioning

confidence: 99%

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

Ganguli

Kenig

2011

Chemical Engineering Science

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On reduced modeling of mass transport in wavy falling films

et al. 2018

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In many industrial units such as packing columns, falling film reactors, etc., the liquid phase is designed as a falling film. It is well known that the mass and heat transfer in laminar wavy film flows is significantly enhanced compared to flat films. The kinetic phenomena underlying the increase in mass and heat transfer are, however, still not fully understood. For an efficient design of falling film units, computational models that account for these enhanced transport mechanisms are of key importance. In this article, we present a reduced modeling approach based on a long-wave approximation to the fluid dynamics of the film. Furthermore, we introduce a new two-dimensional (2D) high-resolution laser-induced luminescence measurement technique. Both in the numerical simulation results and in the high-resolution 2D-concentration measurements obtained in the experiments we observe similar patterns of high concentrations locally, especially in the areas close to the wave hump.Since the species transport is dominated by the liquid side, the key idea toward a reduced model is to reduce the detailed two-phase model to a one-phase model of the liquid film phase only, which is still able to account for the wavy enhancement mechanisms. To this end, the two-phase NSE are replaced byThe colored areas resemble the light collected on the CCD-sensor for the first image (P 1 ) and the second image (P 2 ). [Color figure can be viewed at wileyonlinelibrary.com.]

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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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Analyse des grenzschichtnahen Stofftransports an frei aufsteigenden Gasblasen

Cited by 18 publications

References 3 publications

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

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

On reduced modeling of mass transport in wavy falling films

Laser‐Induced Fluorescence in Multiphase Systems

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