Influence of Wettability on Bubble Formation from Submerged Orifices

Hecht, Kristin; Velagala, Subrahmanyeswara; Easo, Divya Ann; Saleem, Muhammad; Krause, Ulrich

doi:10.1021/acs.iecr.9b04222

Cited by 15 publications

(8 citation statements)

References 46 publications

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“…The differential pressure across the screen sample was calculated by considering the constant hydrostatic head, expressed as Δ p = Δ p DPT – ρ l gH . Note that the static contact angle approximates the value of the dynamic contact angle for the surface tension-dominated bubble breakthrough process with low capillary number. , All of the breakthroughs occur at the screen centers to avoid the influence of the deformation at the screen edge due to the compressive forces at the O-ring seal …”

Section: Methodsmentioning

confidence: 99%

“…Note that the static contact angle approximates the value of the dynamic contact angle for the surface tension-dominated bubble breakthrough process with low capillary number. 25,26 All of the breakthroughs occur at the screen centers to avoid the influence of the deformation at the screen edge due to the compressive forces at the O-ring seal. 27 Antigravity Liquid Delivery Test.…”

Section: ■ Theoretical Basis and Methodologymentioning

confidence: 99%

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Pressure-Driven Phase Separation Based on Modified Porous Mesh for Liquid Management in Microgravity

et al. 2022

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Surface tension becomes the main force influencing the gas–liquid interface in microgravity environment. The instability of the gas–liquid distribution is a menace for spacecraft missions. Passive phase separation based on porous material is a promising technique for microgravity liquid management and advanced life support systems. Here, the mechanism of pressure-driven phase separation based on porous material is experimentally investigated, highlighting the synergistic influence of single-phase flow, breakthrough failure, and self-healing ability on liquid acquisition capability. The major parameters characterizing the separation efficiency are the breakthrough threshold pressure and the flow resistance. A fabrication strategy which elicits the surface wettability and maintains the original surface morphology is proposed and verified to increase the critical breakthrough threshold pressure without introducing extra flow resistance. Moreover, the modified mesh is integrated into a screen channel liquid acquisition device. The improvement of the overall separation performance is evaluated in an antigravity delivery experiment, where the acceleration of liquid is −g 0. It has been demonstrated that the fabrication strategy increases the achievable flow rate over 80% and the reseal flow rate over 200% for gas-free water delivery. This work enriches the understanding of phase separation based on porous material and provides an alternative method for liquid management in microgravity.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Theoretical Basis and Methodologymentioning

confidence: 99%

Pressure-Driven Phase Separation Based on Modified Porous Mesh for Liquid Management in Microgravity

et al. 2022

View full text Add to dashboard Cite

show abstract

“…COMSOL Multiphysics Simulation: COMSOL Multiphysics 5.6 was employed to perform computational analyses in surface-tension-dominant two-phase flows. [50] We systematically adjusted the hydrophobicity of the electrode by manipulating the contact angle of the material within an oxygen-water system. The contact-angle values were determined based on contact-angle measurements.…”

Section: Methodsmentioning

confidence: 99%

Boosting Oxygen Reduction through Microenvironment Modulation to Enhance Mass Transportation

Hu,

Wang,

et al. 2023

Adv Energy and Sustain Res

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Electroreduction of oxygen driven by renewable electricity holds significant promise for the sustainable production of value‐added hydrogen peroxide (H2O2). While water is a desirable source of protons and electrons for this reaction, its low gas solubility often limits the transportation of gas molecules and consequently leads to large concentration overpotential, resulting in unsatisfactory energy efficiencies. Herein, a facile and effective strategy to promote the 2e− oxygen reduction reaction (ORR) through microenvironment modulation is presented. In this work, it is specifically aimed to facilitate oxygen transportation at the reaction interface, particularly at high rates. To achieve this, hydrophobic polytetrafluoroethylene (PTFE) particles are introduced into a catalyst layer containing amino‐group‐functionalized carbon nanotube (CNT‐NH2) as the ORR catalyst for H2O2 production. As a result, the PTFE‐modified CNT‐NH2‐based gas‐diffusion electrode (GDE) substantially improves ORR activity. At 100 mA cm−2, the PTFE‐modified CNT‐NH2 achieves a high cathodic energy efficiency of 92%, 1.5 times higher than the pristine CNT‐NH2‐based GDE (63%). Detailed kinetic analysis reveals that this enhanced ORR performance is indeed due to the enhanced oxygen transportation induced by the persistent hydrophobic microenvironment created by the PTFE‐modified catalyst layer, reducing the concentration overpotential during ORR.

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“…Comsol Multiphysics 5.5 was used to carry out calculations with surface tension dominant two-phase flows 58 . The wettability of the electrode was varied in the simulations by varying the contact angle of the material for a hydrogen-water system.…”

Section: Methodsmentioning

confidence: 99%

Stable solar water splitting with wettable organic-layer-protected silicon photocathodes

Wang

Liu

et al. 2022

Nat Commun

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Protective layers are essential for Si-based photocathodes to achieve long-term stability. The conventionally used inorganic protective layers, such as TiO2, need to be free of pinholes to isolate Si from corrosive solution, which demands extremely high-quality deposition techniques. On the other hand, organic hydrophobic protective layers suffer from the trade-off between current density and stability. This paper describes the design and fabrication of a discontinuous hybrid organic protective layer with controllable surface wettability. The underlying hydrophobic layer induces the formation of thin gas layers at the discontinuous pores to isolate the electrolyte from Si substrate, while allowing Pt co-catalyst to contact the electrolyte for water splitting. Meanwhile, the surface of this organic layer is modified with hydrophilic hydroxyl groups to facilitate bubble detachment. The optimized photocathode achieves a stable photocurrent of 35 mA/cm2 for over 110 h with no trend of decay.

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Influence of Wettability on Bubble Formation from Submerged Orifices

Cited by 15 publications

References 46 publications

Pressure-Driven Phase Separation Based on Modified Porous Mesh for Liquid Management in Microgravity

Pressure-Driven Phase Separation Based on Modified Porous Mesh for Liquid Management in Microgravity

Boosting Oxygen Reduction through Microenvironment Modulation to Enhance Mass Transportation

Stable solar water splitting with wettable organic-layer-protected silicon photocathodes

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