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Tracing Diffusion in Porous Media with Fractal Properties ...
https://epubs.siam.org/doi/abs/10.1137/090760234
This work is concerned with conditional averaging methods which can be used for modeling of transport in porous media with volume reactions in the fluid phase and surface reactions at the fluid/solid interface. The model under consideration takes into account convection, diffusion within the pores and on larger scales, and homogeneous and heterogeneous reactions. Near …
(PDF) Tracing Diffusion in Porous Media with Fractal ...
https://www.researchgate.net/publication/50933767_Tracing_Diffusion_in_Porous_Media_with_Fractal_Properties
tracing diffusion in fractal porous media 1191 standard Wiener process, 1 that is, the simplest Markov diffusion in R 3 ,a n d D is a diffusion co efficient whose pa rticular value is specified ...
Diffusion in Porous Media: Phenomena and Mechanisms ...
https://link.springer.com/article/10.1007/s11242-019-01262-6
Linear and nonlinear diffusion equations provide Darcy-scale representations of various flow and transport phenomena in porous media that are related to the phenomenon of diffusion in a wider sense. These phenomena are not necessarily related to the motion of Brownian particles in a free fluid, but describe instead diffusion of pressure and diffusive propagation of a phase field such …
Diffusion in Porous Media: Phenomena and Mechanisms
http://maeresearch.ucsd.edu/tartakovsky/Papers/tartakovsky-2019-diffusion.pdf
the Knudsen and Fick–Jacobs diffusion); when these constraints are imposed by the solid matrix of a porous medium, the resulting equations provide a pore-scale representation of diffusion.Next,wediscussphenomenologicalDarcy-scaledescriptorsofpore-scalediffusion and provide a few examples of other processes whose Darcy-scale models take the ...
Diffusion in Porous Media - Max Planck Society
http://www.fhi-berlin.mpg.de/acnew/department/pages/teaching/pages/teaching__wintersemester__2008_2009/Cornelia_Breitkopf_Diffusion_FHI_281108.pdf
Diffusion in porous materials •F or d p = const. and pressure decrease: transition from molecular diffusion to Knudsen diffusion • Transition is not clearly defined; both equations apply • Catalysts: irregular network of pores – effective D • For very heterogeneous pore size distributions the term
Surface diffusion in porous media: A critical review ...
https://www.sciencedirect.com/science/article/pii/S1387181111000291
In this review we considered four methods for the study of surface diffusion of particles in porous media: the differential adsorption bed (DAB), time lag, constant molar flow (CMF), and differential permeation (DP) methods. The kinetic models associated with each method were presented.
Effective Diffusion in Fibrous Porous Media: A Comparison ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7914409/
Diffusion simulation through the porous phase was subsequently conducted using LBM of D3Q7 lattice and topological equivalent PNM derived from the watershed method, respectively. It is detected that the effective diffusion coefficients between these two methods are in good agreement when the throat radius in the pore network is estimated using the cross-section …
Tracing interfaces in porous media - ScienceDirect
https://www.sciencedirect.com/science/article/pii/037843719290535X
Volume 191, Issues 1–4, 15 December 1992, Pages 253-257. Tracing interfaces in porous media. Author links open overlay panel Rafael Rangel 1 Rafael Rangel 1
Visualization of gas flow and diffusion in porous media
https://pines.berkeley.edu/sites/default/files/publications/visualization_of_gas_flow_and_diffusion_in_porous_media_0.pdf
technique for porous media is based on the unique imaging contrast that laser-polarized gases provide under conditions of steady-state continuous flow. Because the imaging contrast derives from the transport of laser-polarized gases via flow and diffusion, direct ‘‘snapshots’’ of gas flow and diffusion in the porous samples can be obtained.
Diffusion and Adsorption in porous media
http://ahmadpour.profcms.um.ac.ir/imagesm/282/stories/phocagallery/10-diffusion.pdf
Diffusion Cell. In the diffusion cell configuration, introduced by Buckingham in 1904 and later exploited by Wicke (1940) and Wicke and Kallanbach (1941), gases A and B diffuse across the porous medium. The flow rates of the two sides can be carefully adjusted to give zero pressure gradient across the media. 9.
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