CFD simulation of bubble in flow field: Investigation of dynamic interfacial behaviour in presence of surfactant molecules

Bastani, Dariush; Fayzi, Pouyan; Lotfi, Marzieh; Arzideh, Seyed Mahmoud

doi:10.1016/j.colcom.2018.09.001

Cited by 16 publications

(11 citation statements)

References 33 publications

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“…The change in the interfacial tension in our study is due to increased surfactant concentration. Hence the convection-diffusion equation is considered, which is given by [31], where α is the surfactant concentration in the bulk fluid and D c is the diffusion coefficient of surfactant in bulk liquid.…”

Section: Microfluidic Device Modelmentioning

confidence: 99%

“…Most of these experimental studies consider uniform distribution of surfactant molecules at the droplet interface and focus on the influence of surfactant and its increasing concentration on both size and frequency of droplet generation in various regimes. Numerical simulations can help identify the influence of surfactant concentration at the droplet/ bubble interface [31]. The influence of surfactant (Span 80 mixed with octane) on droplet generation was numerically investigated using Lattice Boltzmann Method [32].…”

Section: Introductionmentioning

confidence: 99%

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Simulation studies on picolitre volume droplets generation and trapping in T-junction microchannels

2020

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In this paper, we present simulation studies on the formation of water microdroplets in mineral oil in a T-junction Microfluidics device. We have studied the droplet generation in two different regimes, viz., squeezing and squeezing to dripping transition regime. The effect of fluid flow rates, and surfactant concentration on the droplet generation has been investigated. It is seen that a rise in the concentration of surfactant by 4%, increases the frequency of droplet generation by 16% at the higher capillary number (C a = 0.02), whereas, there is only a marginal or no change in the case of squeezing regime (C a = 0.0028-0.008). We have also studied the trapping of the generated microdroplets in microwells. It is observed that the trapping of the droplet is highly influenced by the viscous drag force, droplet length, the surface energy of the droplet, droplet speed, depth of the Well for trapping and alignment of the two plates constituting the device. Our studies reveal that the droplets travelling faster than a critical trapping velocity do not get trapped in the Well. Addition of a surfactant to the mineral oil is seen to lead to a significant reduction in the critical velocity for the droplet trapping. Trapping of droplets travelling at velocities close to the critical velocity for trapping depends strongly on the alignment of the two plats of the Slip-Chip device.

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Section: Microfluidic Device Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation studies on picolitre volume droplets generation and trapping in T-junction microchannels

2020

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“…These phenomena can be explained by the dynamic adsorption layer (DAL) theory, which is an acceptable concept for explaining the dynamic behavior of rising bubbles in surfactant solutions 33, 37. This theory is well established for the justification of velocity and shape variations of rising bubbles in surfactant solutions 38, 39. As the result, surface tension, buoyancy, drag, and viscous forces cause the bubble to accelerate.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles

et al. 2021

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Local velocities of bubbles rising in four different nanosilica solutions were investigated experimentally. Also, the density, viscosity, and surface tension of fumed nanosilica and modified nanosilica solutions were measured. Heat treatment and chemical functionalization were used to modify the properties of silica nanoparticles. It was found that the addition of nanosilica affected the hydrodynamics of the rising bubble by increasing the drag friction at the interface. However, environmentally responsive nanosilica particles behaved like surfactant molecules, due to the interfacial activity of hydrophilic and hydrophobic chains. Silica nanoparticles coated with both hydrophilic and hydrophobic agents had a stronger effect on the interfacial properties than those coated only with the hydrophobic agent.

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“…Our preliminary results indicated that for EMAR, as an electrochemical process, the ionic surfactants perform better than nonionic surfactants (e.g., Triton X-100; see Figure S1 in the Supporting Information). In addition, these ionic surfactants are inexpensive, environmentally benign compounds widely used in a variety of applications, including as effective additives in electrochemical systems. , As ionic surfactants, these compounds consist of a charged hydrophilic head group attached to a hydrophobic tail. The influence of these additives on various aspects of the EMAR process was investigated in detail, including their effects on the CO 2 absorption rate and capacity, electrochemical performance, gas desorption rate, electrode stability, and energy requirement.…”

Section: Introductionmentioning

confidence: 99%

Improved CO₂ Capture Performance of Electrochemically Mediated Amine Regeneration Processes with Ionic Surfactant Additives

Rahimi

Zucchelli

Puccini

et al. 2020

ACS Appl. Energy Mater.

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For the effective reduction of global CO 2 emissions, it is essential to develop and deploy efficient and cost-effective technologies for CO 2 capture, especially from large point sources. We recently developed an electrochemically mediated amine regeneration (EMAR) system to replace traditional thermal desorption for the capture of CO 2 from post-combustion flue gases. Despite EMAR effectiveness on a laboratory scale, concerns regarding the high gas-to-liquid ratio in the electrochemical cell and longterm instability of the electrodes need to be addressed before further scale-up of the process to a pilot plant and beyond can be entertained. Accordingly, we investigated the effect of using sodium dodecyl sulfate (SDS) as an anionic surfactant and dodecyltrimethylammonium bromide (DTAB) as a cationic surfactant on the process operation. It was found that it is advantageous to use an anionic surfactant for a system such as EMAR that contains hydrophilic electrodes and a positively charged electrochemically active species. The overall cell resistance was notably reduced when SDS anionic surfactant was used. The precipitation of copper particles observed in the anode outlet when no surfactant was used was effectively avoided when SDS was added to the electrolyte, resulting in electrode stability. In addition, smaller gas bubbles were produced in the presence of the SDS surfactant, which resulted in less blockage of the electrode by the gas with a resultant lower cell potential under constant current conditions, driving more efficient CO 2 desorption. This led to an ∼25% reduction in the electrochemical energy requirement, the lowest ever achieved experimentally for the EMAR process. Overall, the addition of a very low concentration of SDS resulted in the successful circumvention of the important problems faced by the EMAR system regarding further scale-up.

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CFD simulation of bubble in flow field: Investigation of dynamic interfacial behaviour in presence of surfactant molecules

Cited by 16 publications

References 33 publications

Simulation studies on picolitre volume droplets generation and trapping in T-junction microchannels

Simulation studies on picolitre volume droplets generation and trapping in T-junction microchannels

Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles

Improved CO₂ Capture Performance of Electrochemically Mediated Amine Regeneration Processes with Ionic Surfactant Additives

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CFD simulation of bubble in flow field: Investigation of dynamic interfacial behaviour in presence of surfactant molecules

Cited by 16 publications

References 33 publications

Simulation studies on picolitre volume droplets generation and trapping in T-junction microchannels

Simulation studies on picolitre volume droplets generation and trapping in T-junction microchannels

Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles

Improved CO2 Capture Performance of Electrochemically Mediated Amine Regeneration Processes with Ionic Surfactant Additives

Contact Info

Product

Resources

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Improved CO₂ Capture Performance of Electrochemically Mediated Amine Regeneration Processes with Ionic Surfactant Additives