Numerical modeling of carbon dioxide chemisorption in sodium hydroxide solution in a micro-structured bubble column

Jain, Deepak D; Kuipers, J.A.M.; Deen, NG Niels

doi:10.1016/j.ces.2015.07.025

Cited by 28 publications

(26 citation statements)

References 29 publications

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“…However, the former is unstable under the highly alkaline conditions (pH > 12.5) in the pore solution and transforms/converts into carbonate ions ( ). These dissolution and hydration processes of CO 2 have been well described in literatures for both cementitious materials 68 and alkali-activated slag 32 , 69 . Formation of Na-carbonate products: and can react with the abundant Na + in pore solution to form sodium carbonates including Na 2 CO 3 (natron) and NaHCO 3 (nahcolite) precipitates as intermediate products 70 .…”

Section: Resultssupporting

confidence: 58%

Alteration in molecular structure of alkali activated slag with various water to binder ratios under accelerated carbonation

Nguyễn

Phung

et al. 2022

Sci Rep

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Carbonation of alkali activated materials is one of the main deteriorations affecting their durability. However, current understanding of the structural alteration of these materials exposed to an environment inducing carbonation at the nano/micro scale remains limited. This study examined the evolution of phase assemblages of alkali activated slag mortars subjected to accelerated carbonation (1% CO2, 60% relative humidity, up to 28 day carbonation) using XRD, FTIR and 29Si, 27Al, and 23Na MAS NMR. Samples with three water to binder (w/b) ratios (0.35, 0.45, and 0.55) were investigated. The results show that the phase assemblages mainly consisted of C-A-S-H, a disordered remnant aluminosilicate binder, and a minor hydrotalcite as a secondary product. Upon carbonation, calcium carbonate is mainly formed as the vaterite polymorph, while no sodium carbonate is found after carbonation as commonly reported. Sodium acts primarily as a charge balancing ion without producing sodium carbonate as a final carbonation product in the 28-day carbonated materials. The C-A-S-H structure becomes more cross-linked due to the decalcification of this phase as evidenced by the appearance of Q4 groups, which replace the Q1 and Q2 groups as observed in the 29Si MAS NMR spectra, and the dominance of Al(IV) in 27Al MAS NMR. Especially, unlike cementitious materials, the influence of w/b ratio on the crystalline phase formation and structure of C-A-S-H in the alkali activated mortars before and after carbonation is limited.

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Section: Resultssupporting

confidence: 58%

Alteration in molecular structure of alkali activated slag with various water to binder ratios under accelerated carbonation

Nguyễn

Phung

et al. 2022

Sci Rep

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“…They introduce a side force depending on the orientation of an ellipsoidal bubble whereby they solve the simplified Jeffery's equation. Bubble breakup and coalescence of the bubbles can be modeled stochastically , and can be also accounted for the gas‐liquid interface at the top of the column .…”

Section: Two‐phase Systemsmentioning

confidence: 99%

“…accounted for the gas-liquid interface at the top of the column [118]. A limitation of EL is the predicament with the spatial resolution of the continuous phase domain because the cell size must not exceed bubble size excessively [10].…”

Section: Marchisio and Fox [94]mentioning

confidence: 99%

Models for the Numerical Simulation of Bubble Columns: A Review

Mühlbauer

Hlawitschka

Bart

2019

Chemie Ingenieur Technik

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This work reviews the state‐of‐the‐art models for the simulation of bubble columns and focuses on methods coupled with computational fluid dynamics (CFD) where the potential and deficits of the models are evaluated. Particular attention is paid to different approaches in multiphase fluid dynamics including the population balance to determine bubble size distributions and the modeling of turbulence where the authors refer to numerous published examples. Additional models for reactive systems are presented as well as a special chapter regarding the extension of the models for the simulation of bubble columns with a present solid particle phase, i.e., slurry bubble columns.

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“…An overview of the different closure relations used for the forces is given in Table 1. These closures were selected following the work of Lau et al [24] and have been used in several works, within our group [1,24,31] as well as outside [32][33][34]. The interphase two-way coupling is performed through a polynomial mapping in order to map quantities between the Eulerian grid and the Lagrangian bubbles.…”

Section: Bubble Dynamicsmentioning

confidence: 99%

“…In Equation (14), the turbulent Schmidt number is approximated to Sc j T = 1 [31]. Equation (13) is solved for N S − 1 components.…”

Section: Species Transport and Mass Transfermentioning

confidence: 99%

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

et al. 2018

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Phase transition, and more specifically bubble formation, plays an important role in many industrial applications, where bubbles are formed as a consequence of reaction such as in electrolytic processes or fermentation. Predictive tools, such as numerical models, are thus required to study, design or optimize these processes. This paper aims at providing a meso-scale modelling description of gas–liquid bubbly flows including heterogeneous bubble nucleation using a Discrete Bubble Model (DBM), which tracks each bubble individually and which has been extended to include phase transition. The model is able to initialize gas pockets (as spherical bubbles) representing randomly generated conical nucleation sites, which can host, grow and detach a bubble. To demonstrate its capabilities, the model was used to study the formation of bubbles on a surface as a result of supersaturation. A higher supersaturation results in a faster rate of nucleation, which means more bubbles in the column. A clear depletion effect could be observed during the initial growth of the bubbles, due to insufficient mixing.

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Numerical modeling of carbon dioxide chemisorption in sodium hydroxide solution in a micro-structured bubble column

Cited by 28 publications

References 29 publications

Alteration in molecular structure of alkali activated slag with various water to binder ratios under accelerated carbonation

Alteration in molecular structure of alkali activated slag with various water to binder ratios under accelerated carbonation

Models for the Numerical Simulation of Bubble Columns: A Review

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

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