Diffusive growth of successive bubbles in confinement

Soto, Álvaro Moreno; Lohse, Detlef; Meer, Devaraj van der

doi:10.1017/jfm.2019.806

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…Depletion models have already been addressed for bubble growth in supersaturated solutions. , For a system in which both ionic and mass transport are influential, the equation for diffusive mass concentration has a mass and an ionic transport component . In this article, we are interested in the mass transport limitations, and therefore, we may neglect the ionic diffusion through the electrolyte to solve the diffusive mass equation.…”

Section: Results and Discussionmentioning

confidence: 99%

Transient Effects Caused by Gas Depletion during Carbon Dioxide Electroreduction

Soto

Lake

2022

Langmuir

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The novel use of carbon dioxide (CO2) electroreduction to generate carbon-based products which do not contribute to the greenhouse effect has promoted the vision of carbon dioxide as a renewable feedstock for future clean fuel production. Depending on the material choice for the electrocatalysis, a certain variety of products is expected from the carbon dioxide reduction reaction (CO2RR). However, as the CO2 concentration in areas close to the working electrode (relative to the diffusive boundary layer) decreases as it is being consumed and transformed into other products, the generation of H2 is favored to the detriment of CO2 electroreduction. Therefore, the extent to which H2 is produced can be used as a metric to evaluate the efficiency of CO2RR. This article proposes a model that accounts for the modes in which aqueous gas depletion evolves over time and affects the long-term CO2 electroreduction and the corresponding pH evolution near the electrode’s surface. For the latter, two main contributions are distinguished: gas depletion due to CO2 consumption and ion generation in areas close to the electrocatalyst surface. pH is then suggested as an accurate and indirect means to measure CO2 concentration in a liquid electrolyte. We conclude that CO2 depletion causes a strong decay in the electrochemical reaction efficiency. In the end, we discuss several methods which may delay the onset of the adverse effects caused by gas depletion, such as the utilization of pulsed electroreduction, cycling the applied current to electrodes on and off periodically.

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Section: Results and Discussionmentioning

confidence: 99%

Transient Effects Caused by Gas Depletion during Carbon Dioxide Electroreduction

Soto

Lake

2022

Langmuir

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“…It is expected that the interfacial tension tends to retard the bubble growth by opposing the motion of the bubble boundary, and similar behavior is observed from the numerical simulations. Equation (20) clearly illustrates the competition among gas pressure, surface tension, and viscous forces on the right-hand side, as they simultaneously influence the bubble growth. If surface tension effects are weak, then the bubble growth is dictated mainly by the gas pressure.…”

Section: Effect Of Surface Tension Of the Liquid On The Bubble Growthmentioning

confidence: 99%

“…Note that the initial gas pressure (P g0 ) in the bubble is kept constant for all the cases. One can see from Equation (20) the initial magnitude of (p g − p a ) defines the rate of bubble growth. Since the initial pressure p g = 1 is the same for all the cases, and 1 > p a , then a higher p a leads to a lower pressure difference and slower bubble growth, as reflected in Figure 9a-c.…”

Section: Effect Of Ambient Pressure On the Bubble Growthmentioning

confidence: 99%

Bubble Growth in Supersaturated Liquids

Maloth

Khayat

DeGroot

2022

Fluids

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Bubble formation and dissolution have a wide range of industrial applications, from the production of beverages to foam manufacturing processes. The rate at which the bubble expands or contracts has a significant effect on these processes. In the current work, the hydrodynamics of an isolated bubble expanding due to mass transfer in a pool of supersaturated gas–liquid solution is investigated. The complete scalar transportation equation (advection–diffusion) is solved numerically. It is observed that the present model accurately predicted bubble growth when compared with existing approximated models and experiments. The effect of gas–liquid solution parameters such as inertia, viscosity, surface tension, diffusion coefficient, system pressure, and solubility of the gas has been investigated. It is found that the surface tension and inertia have a very minimal effect during the bubble expansion. However, it is observed that the viscosity, system pressure, diffusion, and solubility have a considerable effect on bubble growth.

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“…In the "dripping" state, dispersed bubbles are obtained, and the shear force resists the surface tension. The bubble size is related to the liquid capillary number [14]. At this time, the extrusion force still affects the bubble formation process.…”

Section: Introductionmentioning

confidence: 99%

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Wang

2023

Front. Phys.

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At present, there are relatively few studies on the slug flow generation mode obtained by exchanging gas-liquid two-phase inlets. In this study, an experimental system combining microfluidic devices and high-speed cameras was used to study the effects of gas-liquid two-phase flow rate, liquid physical parameters, etc., On the characteristic length, generation period and other generation characteristics of slug flow, and dimensionless analysis was conducted to investigate the main factors affecting the characteristic length of gas slug. Results show that 1) when the gas flow rate affects the aeroelastic generation characteristics, the aeroelastic characteristic length increases from 443 μm when the gas flow rate increases changes to 657 μm. The generation period decreases rapidly at first and then the change amplitude slows down. The maximum value of aeroelastic generation frequency is 217 s-1; 2) when studying the effect of different liquid flow rates, increasing the liquid flow rate, the characteristic length of the gas bomb gradually decreases, and the generation period of the gas bomb gradually increases. Aeroelastic characteristic length from 770 μm changes to 378 μm. The range of aeroelastic generation cycle is 4–13.4 ms, and the maximum value of aeroelastic generation frequency is 250 s-1; 3) there is a functional relationship between the ratio of aeroelastic characteristic length to channel size L/d and dimensionless gas-liquid flow ratio Q*, Reynolds number Re, Weber number We: L/d=3.677Q*0.58/Re0.11.

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Diffusive growth of successive bubbles in confinement

Cited by 10 publications

References 28 publications

Transient Effects Caused by Gas Depletion during Carbon Dioxide Electroreduction

Transient Effects Caused by Gas Depletion during Carbon Dioxide Electroreduction

Bubble Growth in Supersaturated Liquids

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

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