effect of gas solid interface on pore wall microstructure
Effect of Density and Porosity on the Durability of Flyash
The solid-to-solid distance between the C-S-H layer (gel pore) is found to vary between 5 to 25 A (1 A = 10-5 mm). Due to their size these pores can influence drying shrinkage and creep behaviour of concrete. Compared to C-S-H crystals greater pore sizes are observed between the solid of Ca(OH)2 and calcium sulfoaluminate crystals.
Get PriceAn Anisotropic Microstructure Evolution in a Solid Oxide
Jan 03 2020 · The presented research shows that the long-term operation of a solid oxide fuel cell can lead to substantial anisotropic changes in anode material. The morphology of microstructure in the investigated stack was observed before and after the aging test using electron nanotomography. The microstructural parameters were estimated based on the obtained digital representation of the anode
Get PriceHow does the shape and surface energy of pores affect the
This work shows the effect that different pore geometries pore sizes and fluid–solid energy interactions have on the adsorption of fluids in nanoconfinement. At pore sizes equal (or larger) than 4 nm (the "large" pores in this work roughly 13 times the molecular diameter) the effects of the specific pore shape starts to become irrelevant.
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Wetting is the ability of a liquid to maintain contact with a solid surface resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces.Wetting deals with three phases of matter gas liquid and solid.
Get PriceMicrostructure of Concrete IntechOpen
Oct 27 2015 · The microstructure of concrete can be described in the following three aspects (i) hydrated cement paste which represents the hydration products of cement and water reaction and the main product of this reaction is the calcium silicate hydrate (C-S-H) gel (ii) pore structure which refers to the gel pores capillary pores and voids and
Get PriceEffects of solid loading on pore structure and properties
Feb 15 2019 · Solid loading as a key parameter in gel casting influence both rheological behavior and stability of slurry. It also has strong impacts on microstructure and final properties of porous FeAl intermetallics. In this study a designed non-aqueous gel casting has been developed for fabrication of porous FeAl intermetallics.
Get PriceExuding porous media deviations from Darcy s law
By converting five moles of gas into three or conversely it induces a velocity at the surface directed towards or away from the solid respectively. Fluxes at the pore–solid interface can also result from phase changes. Interesting examples are provided by the water ice–vapour system with sublimation and/or condensation at the solid
Get PriceTailoring the Microstructure of a Solid Oxide Fuel Cell
YSZ has several functions in the anode microstructure including providing ionic conductivity limiting nickel sintering matching the thermal expansion coefficient of the anode with the electrolyte and broadening the triple phase boundaries (TPBs) where nickel (electronic conductor) YSZ (ionic conductor) and pores (fuel gas channels) meet3-5.
Get PricePeter M Derlet Condensed Matter Theory Paul Scherrer
The surface/interface is defined as the plane between condensed matter and a vapour phase or vacuum such as solid/vapour and liquid/vapour interfacesthe term interface is used for the dividing plane between any two different phases. Figure taken from Suk-Joong L. Kang (2004) Sintering Densification Grain Growth and Microstructure.
Get Price(PDF) Pore-scale modeling of the reactive transport of
Due to the computational expense of a detailed pore-scale d˜skO 2 2 reactive transport model only a small section of the cathode can ci 1 − ˜ kO − ˜ kCr O − ˜O = kO − kO k be modeled at the pore-scale and a cell level model of the SOFC dt i ∈ gas is required to establish the boundary conditions at the external boundaries of the
Get Price1. IntroductionHindawi
Considering the wall adhesion effect the contact angle between the solid surface and the fluid is adopted to modify the unit normal (n ) of phase interface nearby the surface (9) n = n w cos θ w t w sin θ w where n w is the unit vectors normal to the wall and t w is tangential to the wall respectively and θ w is the
Get PriceEffects of pore formers on microstructure and performance
The microstructure indicates that graphite results in a porous LSCF cathode with a large surface area and high porosity which can offer a considerably long triple phase boundary for catalytic reactions as well as channels for gas phase transport.
Get PriceInvestigation of porosity and permeability effects from
Dec 21 2004 · Investigation of porosity and permeability effects from microstructure changes during limestone dissolution. Catherine Noiriel. accompanied by a decrease of the pore wall roughness and an increase of the pore connectivity. will determine the configuration of the interface between the CO 2 gas phase and the resident fluid
Get PriceEffect of gas–solid interface on pore wall microstructure
Feb 26 2021 · A new method for regulating the microstructure of pore wall based on gas–solid interface is proposed. The results show that after the initial melting temperature point the appearance of the gas–solid interface provides a large number of heterogeneous nucleation sites which promotes the precipitation of anorthite in the pore wall.
Get PriceEffect of Density and Porosity on the Durability of Flyash
The solid-to-solid distance between the C-S-H layer (gel pore) is found to vary between 5 to 25 A (1 A = 10-5 mm). Due to their size these pores can influence drying shrinkage and creep behaviour of concrete. Compared to C-S-H crystals greater pore sizes are observed between the solid of Ca(OH)2 and calcium sulfoaluminate crystals.
Get PriceThermodynamic Investigation of the Effect of Interface
Jul 23 2017 · solid−liquid phase diagram across the entire composition range for any arbitrary binary solution that forms pure solids including the effect of the contact angle at which the solid− liquid interface contacts a confining pore wall. 1.2. Solid−Liquid Phase Diagrams in the Absence of Curvature. Solid−liquid phase diagrams can have many
Get PriceEffect of Microstructure on the Thermal Properties of
Results indicate that the type of sintering final microstructure specially the phases relation and distribution and not only the amount of copper have a great effect into the thermal properties. By controlling the sintering parameters it is possible to obtain dimensionally stable samples with higher thermal conductivity and lower copper amount.
Get PriceEffect of Density and Porosity on the Durability of Flyash
The solid-to-solid distance between the C-S-H layer (gel pore) is found to vary between 5 to 25 A (1 A = 10-5 mm). Due to their size these pores can influence drying shrinkage and creep behaviour of concrete. Compared to C-S-H crystals greater pore sizes are observed between the solid of Ca(OH)2 and calcium sulfoaluminate crystals.
Get PriceHow does the shape and surface energy of pores affect the
This work shows the effect that different pore geometries pore sizes and fluid–solid energy interactions have on the adsorption of fluids in nanoconfinement. At pore sizes equal (or larger) than 4 nm (the "large" pores in this work roughly 13 times the molecular diameter) the effects of the specific pore shape starts to become irrelevant.
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to simulate the gas phase as well as the heat re- circulation using a network-model for conjugate heat transfer. Section 3 presents a series of two- dimensional pore-resolved simulations with vary- ing solid conduction and inlet velocities and no- table features are discussed. Finally conclusions and discussions of future work are presented in
Get PriceMicrostructure Effects on Effective Gas Diffusion
Oct 03 2018 · In this work we develop a numerical framework for gas diffusion in nanoporous materials including a random generation-growth algorithm for microstructure reconstruction and a multiple-relaxation-time lattice Boltzmann method for solution of diffusion equation with Knudsen effects carefully considered. The Knudsen diffusion is accurately captured by a local diffusion coefficient computed
Get PriceExuding porous media deviations from Darcy s law
By converting five moles of gas into three or conversely it induces a velocity at the surface directed towards or away from the solid respectively. Fluxes at the pore–solid interface can also result from phase changes. Interesting examples are provided by the water ice–vapour system with sublimation and/or condensation at the solid
Get PriceWettingWikipedia
Wetting is the ability of a liquid to maintain contact with a solid surface resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces.Wetting deals with three phases of matter gas liquid and solid.
Get PriceEffect of solid-H2S gas reactions on CZTSSe thin film
The kinetics of the VLS mechanism consists of four steps (1) mass transport in the gas phase (2) chemical reaction at the vapour–liquid interface (3) diffusion in the liquid phase and (4) incorporation of atoms into a crystal lattice. 31 During the mass transport in the gas phase the Zn content of the Sn–Zn alloy liquid droplets can be
Get PriceJID PROCI mNSNovember 10 202021 24
to simulate the gas phase as well as the heat re- circulation using a network-model for conjugate heat transfer. Section 3 presents a series of two- dimensional pore-resolved simulations with vary- ing solid conduction and inlet velocities and no- table features are discussed. Finally conclusions and discussions of future work are presented in
Get PriceDiamond Jet Hybrid HVOF Thermal Spray Rule-Based
process including deformation pore formation and surface roughness are described. 2.1. Deformation. In the HVOF thermal spray process each individual particle is accelerated and heated in a burning gas flame after which it impinges on the substrate in a molten partially molten or solid state. At impact the sudden stagnation of the powder
Get Price(PDF) Pore-scale modeling of the reactive transport of
Due to the computational expense of a detailed pore-scale d˜skO 2 2 reactive transport model only a small section of the cathode can ci 1 − ˜ kO − ˜ kCr O − ˜O = kO − kO k be modeled at the pore-scale and a cell level model of the SOFC dt i ∈ gas is required to establish the boundary conditions at the external boundaries of the
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