Tortuosity-porosity relation in porous media flow

Matyka, Maciej; Khalili, Arzhang; Koza, Zbigniew

doi:10.1103/physreve.78.026306

Cited by 394 publications

(291 citation statements)

References 34 publications

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“…the ratio of the distance connecting two points by a straight line and the shortest distance through the pore system, can be derived from these data using direct measurements or geodesic reconstructions [9]. For the diffusional tortuosity, random walk simulations following the Monte Carlo method [10,11] can be used while the hydraulic tortuosity is accessible through simulations of flow using the Lattice Boltzmann method [12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Particle Diffusion in Complex Nanoscale Pore Networks

et al. 2015

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We studied the diffusion of particles in the highly irregular pore networks of chalk, a very fine grained rock, by combining three dimensional X-ray imaging and dissipative particle dynamics (DPD) simulations. X-ray imaging data were collected at 25 nm voxel dimension for two chalk samples with very different porosities (5% and 26%). The three dimensional pore systems derived from the tomograms were imported into DPD simulations and filled with spherical particles of variable diameter and with an optional attractive interaction to the pore surfaces. We found that diffusion significantly decreased to as much as 60% when particle size increased from 1% to 35% of the average pore diameter). When particles were attracted to the pore surfaces, 2 even very small particles, diffusion was drastically inhibited, by as much as a factor of 100.Thus, the size of particles and their interaction with the pore surface strongly influence particle mobility and must be taken into account for predicting permeability in nanoporous rocks from primary petrophysical parameters such as surface area, porosity and tortuosity.

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Section: Introductionmentioning

confidence: 99%

Particle Diffusion in Complex Nanoscale Pore Networks

et al. 2015

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“…However, the fact that we can make direct measurements of the tortuosity is signicant improvement for classical reaction modelling, which typically approximated tortuosity by the inverse of porosity. [33][34][35] There is also direct evidence for the loss of overall porosity in comparing the pore networks at 1223 K, both before the carbonation reaction, and aer. Fig.…”

Section: Morphological Changes In Cao Upon Carbonation and Calcinatiomentioning

confidence: 94%

In situstudies of materials for high-temperature CO₂capture and storage

Dunstan¹,

Wen²,

Pavan³

et al. 2015

Acta Cryst Sect A

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Carbon capture and storage (CCS) offers a possible solution to curb the CO 2 emissions from stationary sources in the coming decades, considering the delays in shifting energy generation to carbon neutral sources such as wind, solar and biomass. The most mature technology for post-combustion capture uses a liquid sorbent, amine scrubbing. However, with the existing technology, a large amount of heat is required for the regeneration of the liquid sorbent, which introduces a substantial energy penalty.The use of alternative sorbents for CO 2 capture, such as the CaO-CaCO 3 system, has been investigated extensively in recent years. However there are significant problems associated with the use of CaO based sorbents, the most challenging one being the deactivation of the sorbent material. When sorbents such as natural limestone are used, the capture capacity of the solid sorbent can fall by as much as 90 mol% after the first 20 carbonation-regeneration cycles. In this study a variety of techniques were employed to understand better the cause of this deterioration from both a structural and morphological standpoint. X-ray and neutron PDF studies were employed to understand better the local surface and interfacial structures formed upon reaction, finding that after carbonation the surface roughness is decreased for CaO. In situ synchrotron X-ray diffraction studies showed that carbonation with added steam leads View Article OnlineView Journal | View Issue to a faster and more complete conversion of CaO than under conditions without steam, as evidenced by the phases seen at different depths within the sample. Finally, in situ X-ray tomography experiments were employed to track the morphological changes in the sorbents during carbonation, observing directly the reduction in porosity and increase in tortuosity of the pore network over multiple calcination reactions.

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“…Generally, in the case of open geometry where the pores are well connected by the channels, with an increase in tortuosity arising when the number and size of barriers that must be overcome by diffusible molecule increases [22]. Many proposals can be encountered in the literature of the tortuosityporosity relation for the porous systems under consideration [23]. Depending on the shape of the elements constituting the rigid network of the porous material, these relations have an exponential or linear character.…”

Section: Tortuositymentioning

confidence: 99%

The structural parameters of rigid matrix of saccharide-based gel described by short and long diffusion regime analysis

Kowalczuk

2017

J Mater Sci

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The tortuosity-porosity relation and internal structure diameters in a selected organogel are studied. The diffusion coefficient measured by pulsed field gradient NMR at short and long observation times can be used to estimate the tortuosity and the pore surface-to-volume (S/V pore ) ratio of a porous material (Latour et al. in J Magn Res A 112:83-91, 1995; Mair et al. in Magn Res Imaging 19:345-351, 2001; Mitra et al. in Phys Rev B 47(14):8565-8574, 1993; Valiullin and Skirda in J Chem Phys 114:452-458, 2001). The value of S/V pore allows to calculate the average pore and barrier diameters. In the experiment, the timedependent diffusion coefficient of toluene in a low molecular weight gelator methyl-4,6-O-(p-nitrobenzylidene)-a-D-glucopyranoside (Gluco-NO 2 ) matrix was measured. The results revealed the relation between the diffusion coefficient of toluene and the concentration of gelator Gluco-NO 2 in the system. With increasing Gluco-NO 2 compound in the sample, the diffusion coefficient of toluene decreases. On the basis of the diffusion coefficient behaviour as a function of time and gelator concentration, the fibrous structure of the gel matrix was identified and the structural parameters of the system were investigated.

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Tortuosity-porosity relation in porous media flow

Cited by 394 publications

References 34 publications

Particle Diffusion in Complex Nanoscale Pore Networks

Particle Diffusion in Complex Nanoscale Pore Networks

In situstudies of materials for high-temperature CO₂capture and storage

The structural parameters of rigid matrix of saccharide-based gel described by short and long diffusion regime analysis

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Tortuosity-porosity relation in porous media flow

Cited by 394 publications

References 34 publications

Particle Diffusion in Complex Nanoscale Pore Networks

Particle Diffusion in Complex Nanoscale Pore Networks

In situstudies of materials for high-temperature CO2capture and storage

The structural parameters of rigid matrix of saccharide-based gel described by short and long diffusion regime analysis

Contact Info

Product

Resources

About

In situstudies of materials for high-temperature CO₂capture and storage