Pore-scale modeling of effective diffusion coefficient of building materials

2015 ◽  
Vol 90 ◽  
pp. 1266-1274 ◽  
Author(s):  
Mazhar Hussain ◽  
En Tian ◽  
Tao-Feng Cao ◽  
Wen-Quan Tao
Keyword(s):  
Diffusion Coefficient ◽  
Effective Diffusion Coefficient ◽  
Building Materials ◽  
Effective Diffusion ◽  
Pore Scale ◽  
Scale Modeling ◽  
Pore Scale Modeling

scholarly journals Computing and Comparing Effective Properties for Flow and Transport in Computer-Generated Porous Media

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-24 ◽  
Author(s):  
Rebecca Allen ◽  
Shuyu Sun
Keyword(s):  
Porous Media ◽  
Diffusion Coefficient ◽  
Effective Diffusion Coefficient ◽  
Stokes Equations ◽  
Effective Properties ◽  
Effective Diffusion ◽  
Pore Geometry ◽  
Flow And Transport ◽  
Scale Modeling ◽  
Line Array

We compute effective properties (i.e., permeability, hydraulic tortuosity, and diffusive tortuosity) of three different digital porous media samples, including in-line array of uniform shapes, staggered-array of squares, and randomly distributed squares. The permeability and hydraulic tortuosity are computed by solving a set of rescaled Stokes equations obtained by homogenization, and the diffusive tortuosity is computed by solving a homogenization problem given for the effective diffusion coefficient that is inversely related to diffusive tortuosity. We find that hydraulic and diffusive tortuosity can be quantitatively different by up to a factor of ten in the same pore geometry, which indicates that these tortuosity terms cannot be used interchangeably. We also find that when a pore geometry is characterized by an anisotropic permeability, the diffusive tortuosity (and correspondingly the effective diffusion coefficient) can also be anisotropic. This finding has important implications for reservoir-scale modeling of flow and transport, as it is more realistic to account for the anisotropy ofboththe permeability and the effective diffusion coefficient.

Pore-Scale Modeling of Electrokinetics in Geomaterials

2021 ◽  
Author(s):  
Pikee Priya ◽  
Kristopher L. Kuhlman ◽  
Narayana R. Aluru
Keyword(s):  
Pore Scale ◽  
Scale Modeling ◽  
Pore Scale Modeling

scholarly journals Pore-Scale Modeling of Fluid–Rock Chemical Interactions in Shale during Hydraulic Fracturing

2021 ◽  
Author(s):  
Hossein Fazeli ◽  
Veerle Vandeginste ◽  
Arash Rabbani ◽  
Masoud Babaei ◽  
Bagus Muljadi
Keyword(s):  
Hydraulic Fracturing ◽  
Pore Scale ◽  
Chemical Interactions ◽  
Scale Modeling ◽  
Pore Scale Modeling

Diffusion of Heavy Oil in SiO2 Model Catalyst and FCC Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 158-163 ◽  
Author(s):  
Zi Yuan Liu ◽  
Sheng Li Chen ◽  
Peng Dong ◽  
Xiu Jun Ge
Keyword(s):  
Diffusion Coefficient ◽  
Pore Size ◽  
Effective Diffusion Coefficient ◽  
Pore Diameter ◽  
Effective Diffusion ◽  
Model Catalyst ◽  
Average Pore ◽  
Diffusion Factor ◽  
Fcc Catalyst ◽  
Fcc Catalysts

Through the measured effective diffusion coefficients of Dagang vacuum residue supercritical fluid extraction and fractionation (SFEF) fractions in FCC catalysts and SiO2model catalysts, the relation between pore size of catalyst and effective diffusion coefficient was researched and the restricted diffusion factor was calculated. The restricted diffusion factor in FCC catalysts is less than 1 and it is 1~2 times larger in catalyst with polystyrene (PS) template than in conventional FCC catalyst without template, indicating that the diffusion of SFEF fractions in the two FCC catalysts is restricted by the pore. When the average molecular diameter is less than 1.8 nm, the diffusion of SFEF fractions in SiO2model catalyst which average pore diameter larger than 5.6 nm is unrestricted. The diffusion is restricted in the catalyst pores of less than 8 nm for SFEF fractions which diameter more than 1.8 nm. The tortuosity factor of SiO2model catalyst is obtained to be 2.87, within the range of empirical value. The effective diffusion coefficient of the SFEF fractions in SiO2model catalyst is two orders of magnitude larger than that in FCC catalyst with the same average pore diameter. This indicate that besides the ratio of molecular diameter to the pore diameter λ, the effective diffusion coefficient is also closely related to the pore structure of catalyst. Because SiO2model catalyst has uniform pore size, the diffusion coefficient can be precisely correlated with pore size of catalyst, so it is a good model material for catalyst internal diffusion investigation.

Pore-scale modeling of oil mobilization trapped in a square cavity

2016 ◽  
Vol 14 (4) ◽  
pp. 1800-1807 ◽  
Author(s):  
Joelson Kalil Coelho ◽  
Mariana Dias Pena ◽  
Oldrich Joel Romero
Keyword(s):  
Pore Scale ◽  
Square Cavity ◽  
Scale Modeling ◽  
Pore Scale Modeling
Sign in / Sign up

Export Citation Format

Share Document