Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column

Wang, Chao; Xu, Zhijie; Lai, Canhai; Sun, Xin

doi:10.1016/j.ces.2018.03.021

Cited by 44 publications

(23 citation statements)

References 28 publications

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“…Equilibrium conditions at the interface are achieved immediately. Wang et al (2018) give an overview over multiple criteria, why these assumptions are complicated to be applied to real-life applications. Local flow regimes could vary between laminar, transitional or turbulent.…”

Section: Mass Transfermentioning

confidence: 99%

“…Both account for the variability of the flux over time. But still they do not account for local variations of fluid velocities, physical properties and different flow regimes (Wang et al, 2018). This is why in recent years, more and more advanced CFD models have been developed to analyse mass transfer phenomena, many of them using the VOF method.…”

Section: Mass Transfermentioning

confidence: 99%

“…This is why in recent years, more and more advanced CFD models have been developed to analyse mass transfer phenomena, many of them using the VOF method. A one-fluid formulation accounting for advection, diffusion and possibly chemical reactions can be used to describe flow and chemical kinetics (Wang et al, 2018).…”

Section: Mass Transfermentioning

confidence: 99%

“…These different approaches are empirical or theoretical connections between oxygen and H 2 S transfer on the one hand and empirical models linking H 2 S emissions to flow properties in the pipe on the other hand (Carrera et al, 2016). Wang et al (2018) highlight the shortcomings of the two-film theory. It cannot account for local changes of the flow regime or variations of fluid properties.…”

Section: Introductionmentioning

confidence: 99%

“…The most limiting factor however is assumed to be the one-dimensionality of the approach. More advanced approaches, the penetration theory and the surface renewal theory, can account for the variability of the flux over time but do not account for local variations, the change of fluid properties or flow regimes (Wang et al, 2018). This has already led to wide applications of CFD models for mass transfer applications in the chemical industry (Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Using computational fluid dynamics to describe H2S mass transfer across the water–air interface in sewers

Teuber

Broecker

Bentzen

et al. 2019

Water Science and Technology

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For the past 70 years, researchers have dealt with the investigation of odour in sewer systems caused by hydrogen sulphide formations and the development of approaches to describe it. The state-of-the-art models are one-dimensional. At the same time, flow and transport phenomena in sewers can be three-dimensional, for example the air flow velocities in circular pipes or flow velocities of water and air in the reach of drop structures. Within the past years, increasing computational capabilities enabled the development of more complex models. This paper uses a three-dimensional two-phase computational fluid dynamics model to describe mass transfer phenomena between the two phases: water and air. The solver has been extended to be capable of accounting account for temperature dependency, the influence of pH value and a conversion to describe simulated air phase concentrations as partial pressure. Its capabilities are being explored in different application examples and its advantages compared to existing models are demonstrated in a highly complex three-dimensional test case. The resulting interH2SFoam solver is a significant step in the direction of describing and analysing H2S emissions in sewers.

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Section: Mass Transfermentioning

confidence: 99%

Section: Mass Transfermentioning

confidence: 99%

Section: Mass Transfermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Using computational fluid dynamics to describe H2S mass transfer across the water–air interface in sewers

Teuber

Broecker

Bentzen

et al. 2019

Water Science and Technology

View full text Add to dashboard Cite

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Absorption

Karayiannis

Laso

2018

Kirk-Othmer Encyclopedia of Chemical Technology

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Absorption, or gas absorption, is a unit operation used in the chemical industry to separate gases by washing or scrubbing a gas mixture with a suitable liquid. One or more of the gas components dissolves or is absorbed in the liquid and is thus removed from the mixture. Absorption is currently one of the most important processes in chemical engineering not only for product recovery but also, and perhaps mainly, for pollutant removal. Intense industrial and academic effort is focused on optimizing the process, in terms process efficiency as well as commercial aspects. In this article, the fundamental principles of gas solubility and mass transfer, design and operation of industrial equipment with relevant examples of typical commercial gas absorption processes are discussed, including recent developments in these areas.

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The Influence of Gas–Liquid Interfacial Transport Theory on Numerical Modelling of Plasma Activation of Water

Silsby

Simon

Walsh

et al. 2021

Plasma Chem Plasma Process

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Plasma activated water has shown great promise in a number of emerging application domains; yet the interaction between non-equilibrium plasma and liquid represents a complex multiphase process that is difficult to probe experimentally, necessitating the development of accurate numerical models. In this work, a global computational model was developed to follow the concentrations of aqueous reactive species in water treated using a surface barrier discharge in ambient air. While the two-film theory has long superseded other methods of modelling mass transfer in such areas of research as environmental and aerosol science, plasma modelling studies continue to use equilibrium and one-film theories. The transport of reactive species across the gas–liquid interface was therefore treated using the one-film and two-film theories, with the results compared to ascertain which is most appropriate for PAW modelling studies. Comparing the model-predicted concentrations to those measured, it was shown that concentrations of aqueous H+ and NO3− ions were better represented by the two-film theory, more closely fitting experimental measurements in trend and in magnitude by a factor of ten, while HNO2 and NO2− showed a slightly worse fit using this theory. This is attributed to the assumption in two-film theory of a gas-phase stagnant film which provides additional resistance to the absorption of hydrophilic species, which is absent in the one-film theory, which could be improved with a more accurate value of the Sherwood number for each species.

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Beyond the standard two-film theory: Computational fluid dynamics simulations for carbon dioxide capture in a wetted wall column

Cited by 44 publications

References 28 publications

Using computational fluid dynamics to describe H2S mass transfer across the water–air interface in sewers

Using computational fluid dynamics to describe H2S mass transfer across the water–air interface in sewers

Absorption

The Influence of Gas–Liquid Interfacial Transport Theory on Numerical Modelling of Plasma Activation of Water

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