The effects of bubble detachment shape on rising bubble hydrodynamics

Fayzi, Pouyan; Bastani, Dariush; Lotfi, Marzieh; Khararoodi, Mohammad Ghamangiz

doi:10.24200/sci.2018.51823.2383

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…We speculate that the observed bubble release trends are linked to specific geometric properties that impact the bubble triple-phase contact line, including (1) relative abundance of geometric edges and planes, (2) inclined planes that create asymmetrical bubble shapes with varying contact angles, thereby modifying the buoyant and adhesion forces around the bubble, (3) boosted coalescence of neighboring bubbles at preferred angles and geometries, and (4) a discontinuous triple interface (electrode/bubble/electrolyte) that reduces the true contact area and adhesion forces depending on the location ( i.e. , edges and planes). ,, Regarding our electrode architectures, the following aspects can be summarized. First, bubble release effects could be related to the differences in the abundance of edge and plane features.…”

Section: Resultsmentioning

confidence: 99%

Tailoring 3D-Printed Electrodes for Enhanced Water Splitting

Márquez-Montes

Son

Rose

et al. 2022

ACS Appl. Mater. Interfaces

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Alkaline water electrolysis, a promising technology for clean energy storage, is constrained by extrinsic factors in addition to intrinsic electrocatalytic activity. To begin to compare between catalytic materials for electrolysis applications, these extrinsic factors must first be understood and controlled. Here, we modify extrinsic electrode properties and study the effects of bubble release to examine how the electrode and surface design impact the performance of water electrolysis. We fabricate robust and cost-effective electrodes through a sequential three-dimensional (3D) printing and metal deposition procedure. Through a systematic assessment of the deposition procedure, we confirm the close relationship between extrinsic electrode properties (i.e., wettability, surface roughness, and electrochemically active surface area) and electrochemical performance. Modifying the electrode geometry, size, and electrolyte flow rate results in an overpotential decrease and different bubble diameters and lifetimes for the hydrogen (HER) and oxygen evolution reactions (OER). Hence, we demonstrate the essential role of the electrode architecture and forced electrolyte convection on bubble release. Additionally, we confirm the suitability of ordered, Ni-coated 3D porous structures by evaluating the HER/OER performance, bubble dissipation, and long-term stability. Finally, we utilize the 3D porous electrode as a support for studying a benchmark NiFe electrocatalyst, confirming the robustness and effectiveness of 3D-printed electrodes for testing electrocatalytic materials while extrinsic properties are precisely controlled. Overall, we demonstrate that tailoring electrode architectures and surface properties result in precise tuning of extrinsic electrode properties, providing more reproducible and comparable conditions for testing the efficiency of electrode materials for water electrolysis.

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Section: Resultsmentioning

confidence: 99%

Tailoring 3D-Printed Electrodes for Enhanced Water Splitting

Márquez-Montes

Son

Rose

et al. 2022

ACS Appl. Mater. Interfaces

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“…Rising‐bubble experiments are very suitable for the investigation of the dynamic behavior of gas‐liquid interfaces 33, 37, 38, 41–44. They were widely used to study the rising‐bubble hydrodynamics, drag forces, and characteristic trajectories.…”

Section: Methodsmentioning

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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“…To our knowledge, the bubble dynamic behavior by BEM (Boundary Element Method) near the boundary with the axial symmetry like a narrow channel compared with the rigid boundary or free boundary has rarely been studied in the literature [13][14][15][16][17][18]. In most of the studies related to bubble dynamics inside the narrow channel based on BEM, viscosity effects are ignored.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of viscosity on bubble dynamics in a narrow channel

2019

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In this paper, dynamic behavior of a vapor bubble inside a narrow channel filled with a viscous liquid has been studied numerically. The boundary integral equation method (BIEM) and the procedure of viscous correction of viscous potential flow (VCVPF) have been employed for obtaining the vapor bubble profiles during its pulsations inside the narrow channel filled with a viscous liquid. In the present paper a new method has been proposed for considering the effects of viscosity in a viscous liquid flow in the framework of the Green's integral formula together with the modified form of unsteady Bernoulli equation. The reported experimental and numerical results of the problem under investigation have been used for verification of the results of the present work. Numerical results show that, by increasing the viscosity of liquid around the vapor bubble, the bubble lifetime increases. Numerical results also indicate that for Reynolds numbers with the order of 3 (10 ) O , the viscosity effects are extremely reduced. Furthermore, the dynamic behavior of the bubble in water and oil is investigated at different Reynolds numbers and at different so-called dimensionless channel radii. KeywordsBubble dynamics, boundary element method, viscous pressure correction, narrow channel, viscous potential flow 30 computational uid dynamics. His interest extends to the field of droplet management, fluid flow in porous media (oil recovery enhancement), and impinging jets. Professor Shervani-Tabar has published more than 45 publications.

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The effects of bubble detachment shape on rising bubble hydrodynamics

Cited by 4 publications

References 37 publications

Tailoring 3D-Printed Electrodes for Enhanced Water Splitting

Tailoring 3D-Printed Electrodes for Enhanced Water Splitting

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

Numerical investigation of the effect of viscosity on bubble dynamics in a narrow channel

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