A numerical Euler–Lagrange method for bubble tower CO2 dissolution modeling

Legendre, Daniel; Zevenhoven, Ron

doi:10.1016/j.cherd.2016.04.010

Cited by 15 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The EE approach assumes that phases are interpenetrating, which is efficient when modelling large-scale industrial processes [18,19], while EL tracks the dispersed phases individually, which can be computationally expensive [20,21]. As both EE and EL approaches do not resolve the complete interactions between the phases, they require so called "closure laws" (see [18][19][20][21]). Interface tracking methods, such as the moving mesh method, use a separate boundary-fitted moving mesh for each phase [22].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Surface Tension Models for the Volume of Fluid Method

Vachaparambil

Einarsrud

2019

Processes

View full text Add to dashboard Cite

With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of spurious velocities (or currents), arising due to inaccuracies in calculations of the surface tension force. These spurious currents cause nonphysical flows which can adversely affect the predictive capability of these simulations. In this paper, we implement the Continuum Surface Force (CSF), Smoothed CSF and Sharp Surface Force (SSF) models in OpenFOAM. The models were validated for various multiphase flow scenarios for Capillary numbers of 10 − 3 –10. All the surface tension models provide reasonable agreement with benchmarking data for rising bubble simulations. Both CSF and SSF models successfully predicted the capillary rise between two parallel plates, but Smoothed CSF could not provide reliable results. The evolution of spurious current were studied for millimetre-sized stationary bubbles. The results shows that SSF and CSF models generate the least and most spurious currents, respectively. We also show that maximum time step, mesh resolution and the under-relaxation factor used in the simulations affect the magnitude of spurious currents.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparison of Surface Tension Models for the Volume of Fluid Method

Vachaparambil

Einarsrud

2019

Processes

View full text Add to dashboard Cite

show abstract

“…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%

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

“…9 In reactors that use diffusers for ozone dosing, the fluid flow is driven by a bubbly flow induced by the increase of polydisperse ozone bubbles 10 with the flow-controlled bubble distribution influencing the interfacial mass transfer of the ozone gas. 11 The interfacial ozone transfer coupled with the convection-diffusion of ozone in aqueous phase determines the local concentration of ozone, with this concentration critical to the rate of the chemical reactions occurring in the system. 12 It is commonly reported that the effectiveness of the pure ozonation process is limited by the poor mass transfer efficiency and low ozone utilization efficiency.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

Lian

Jiang

Garg

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

The efficacy of oxidation of recalcitrant organic contaminants in municipal and industrial wastewaters by ozonation is influenced by chemical reaction kinetics and hydrodynamics within a reactor. A 3D computational fluid dynamics (CFD) model incorporating both multiphase flow and reaction kinetics describing ozone decay, hydroxyl radical ( • OH) generation, and organic oxidation was developed to simulate the performance of continuous flow ozonation reactors. Formate was selected as the target organic in this study due to its well-understood oxidation pathway. Simulation results revealed that the dissolved ozone concentration in the reactor is controlled by rates of O 3 (g) interphase transfer and ozone self-decay. Simulations of the effect of various operating conditions showed that the reaction stoichiometric constraints between formate and ozone were reached; however, complete utilization of gas phase ozone was hard to achieve due to the low ozone interphase mass transfer rate. Increasing the O 3 (g) concentration leads to an increase in the formate removal rate by ∼5% due to an enhancement in the rate of O 3 (g) interphase mass transfer. The CFD model adequately describes the mass transfer occurring in the two-phase flow system and confirms that O 3 (g) interphase mass transfer is the ratelimiting step in contaminant degradation. The model can be used to optimize the ozone reactor design for improved contaminant degradation and ozonation efficiency.

show abstract

A numerical Euler–Lagrange method for bubble tower CO2 dissolution modeling

Cited by 15 publications

References 24 publications

Comparison of Surface Tension Models for the Volume of Fluid Method

Comparison of Surface Tension Models for the Volume of Fluid Method

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

Contact Info

Product

Resources

About