Numerical simulation of the collision of two microdroplets with a pseudopotential multiple-relaxation-time lattice Boltzmann model

Monaco, Ernesto; Brenner, Günther; Luo, Kai

doi:10.1007/s10404-013-1202-0

Cited by 23 publications

(7 citation statements)

References 59 publications

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“…43 For pure WO 3– X , three distinctive absorption bands at 754, 819, and 932 cm –1 can be observed, where the first two were endorsed to the W–O–W/O–W–O interbridging stretching vibration and the third peak corresponding to W=O terminal stretching. 44,45 Due to low wt % loading of Ag NPs, no vibration modes appeared in WA5 and W5A5L1 photocatalysts. In comparison to bare WO 3– X , the intensities of O–W–O stretching vibration peaks in both binary (WA5 and W5L1) and ternary heterostructures (W5A5L1) became weaker along with its position slightly shifted.…”

Section: Resultsmentioning

confidence: 99%

Construction of a Z-Scheme Dictated WO_3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H₂ Evolution

2019

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Herein, we have designed nonstoichiometric WO3, coupled with ZnCr layered double hydroxide (LDH) nanosheeet through Ag nanoparticle as the solid-state electron mediator to form WO3–X/Ag/ZnCr LDH Z-scheme photocatalyst. The presence of oxygen defect levels in as-synthesized materials was confirmed by Raman, X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) analyses. The photocatalytic performance of the catalysts was investigated by the tetracycline degradation and H2 energy production under visible light irradiation. The WO3–X/Ag/ZnCr LDH ternary heterostructure exhibits superior activity toward tetracycline degradation and hydrogen evolution. The excellent photocatalytic performance of the catalyst was attributed to the synergistic effects among three species (WO3–X, Ag, and ZnCr LDH) and the enhanced separation efficiency of photoinduced charge carriers through the Z-scheme WO3–X/Ag/ZnCr LDH system. In addition, the created oxygen deficiency on WO3–X could improve the photocatalytic behavior of ZnCr LDH in heterostructure by delaying the recombination efficiency of photoexcited electron–hole pairs. Furthermore, the higher affinity of tetracycline at the oxygen defect levels of the photocatalyst supports the high rate of tetracycline degradation. The enhanced photocatlytic activity of the catalysts was further supported by PL spectra and photoelectrochemical studies (electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) plot). The present research opens up a new strategy for designing highly efficient visible light-induced Z-scheme-based photocatalysts with high population of active sites for energy and environmental applications in a sustainable manner.

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Section: Resultsmentioning

confidence: 99%

Construction of a Z-Scheme Dictated WO_3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H₂ Evolution

2019

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“…EWOD-based (electrowetting-on-dielectric) devices have been developed to mix the merged droplet rapidly, accelerated through active manipulation of the droplets with linear electrodes and a varied aspect ratio of the droplets (Paik et al 2003). Several researchers investigated the morphology and dynamics of the droplet collision and coalescence on a plane surface (Kapur and Gaskell 2007) or in a microchannel (Jose and Cubaud 2012) using planefilm (Tung et al 2009), μ-PIV (Lu et al 2008;Ortiz-Dueñas et al 2010) and simulation tools (Monaco et al 2014). We have already done much work on the measurement of coalescence, internal flows inside the coalesced droplet and evolution of three-dimensional mixing patterns inside a droplet (Lai et al 2010a, b;Yeh et al 2013;Huang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Chemical reaction and mixing inside a coalesced droplet after a head-on collision

Yeh

Sheen

Yang

2014

Microfluid Nanofluid

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“…where the actual physical velocity u is taken from Equation (5). Other available schemes are the Exact Difference Model (EDM) [17,29] and Guo's [30]. These schemes result in a further term at the right-hand side of (1), the source term S i (x, t).…”

Section: Pseudopotential Lattice Boltzmann Modelmentioning

confidence: 99%

Equation of State’s Crossover Enhancement of Pseudopotential Lattice Boltzmann Modeling of CO2 Flow in Homogeneous Porous Media

Ashirbekov

Kabdenova

Monaco

et al. 2021

Fluids

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The original Shan-Chen’s pseudopotential Lattice Boltzmann Model (LBM) has continuously evolved during the past two decades. However, despite its capability to simulate multiphase flows, the model still faces challenges when applied to multicomponent-multiphase flows in complex geometries with a moderately high-density ratio. Furthermore, classical cubic equations of state usually incorporated into the model cannot accurately predict fluid thermodynamics in the near-critical region. This paper addresses these issues by incorporating a crossover Peng–Robinson equation of state into LBM and further improving the model to consider the density and the critical temperature differences between the CO2 and water during the injection of the CO2 in a water-saturated 2D homogeneous porous medium. The numerical model is first validated by analyzing the supercritical CO2 penetration into a single narrow channel initially filled with H2O, depicting the fundamental role of the driving pressure gradient to overcome the capillary resistance in near one and higher density ratios. Significant differences are observed by extending the model to the injection of CO2 into a 2D homogeneous porous medium when using a flat versus a curved inlet velocity profile.

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Numerical simulation of the collision of two microdroplets with a pseudopotential multiple-relaxation-time lattice Boltzmann model

Cited by 23 publications

References 59 publications

Construction of a Z-Scheme Dictated WO_3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H₂ Evolution

Construction of a Z-Scheme Dictated WO_3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H₂ Evolution

Chemical reaction and mixing inside a coalesced droplet after a head-on collision

Equation of State’s Crossover Enhancement of Pseudopotential Lattice Boltzmann Modeling of CO2 Flow in Homogeneous Porous Media

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Numerical simulation of the collision of two microdroplets with a pseudopotential multiple-relaxation-time lattice Boltzmann model

Cited by 23 publications

References 59 publications

Construction of a Z-Scheme Dictated WO3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H2 Evolution

Construction of a Z-Scheme Dictated WO3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H2 Evolution

Chemical reaction and mixing inside a coalesced droplet after a head-on collision

Equation of State’s Crossover Enhancement of Pseudopotential Lattice Boltzmann Modeling of CO2 Flow in Homogeneous Porous Media

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Product

Resources

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Construction of a Z-Scheme Dictated WO_3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H₂ Evolution

Construction of a Z-Scheme Dictated WO_3–X/Ag/ZnCr LDH Synergistically Visible Light-Induced Photocatalyst towards Tetracycline Degradation and H₂ Evolution