Tortuosity in Porous Media: A Critical Review

Ghanbarian, Behzad; Hunt, A. G.; Ewing, Robert P.; Sahimi, Muhammad

doi:10.2136/sssaj2012.0435

Cited by 661 publications

(435 citation statements)

References 93 publications

Supporting

Mentioning

417

Contrasting

Unclassified

Order By: Relevance

“…Consequently, we have The tortuosity τ = (l/l t ) 2 still remains unknown. Many tortuosity models for electric, hydraulic, or diffusive conductivity have been proposed by empirical, analytical, and numerical approaches (Ghanbarian et al 2013). In porous media with micro-/nanoscale pores, however, both contributions of viscous flow and Knudsen diffusion appear, and hence, the tortuosity of such porous media is unclear.…”

Section: Knudsen Diffusion In Porous Mediamentioning

confidence: 99%

A study on pressure-driven gas transport in porous media: from nanoscale to microscale

Kawagoe

Oshima

Tomarikawa

et al. 2016

Microfluid Nanofluid

View full text Add to dashboard Cite

Section: Knudsen Diffusion In Porous Mediamentioning

confidence: 99%

A study on pressure-driven gas transport in porous media: from nanoscale to microscale

Kawagoe

Oshima

Tomarikawa

et al. 2016

Microfluid Nanofluid

View full text Add to dashboard Cite

“…), each with associated definitions and areas of application. 4,5 The microstructure of porous electrode and support layers in electrochemical devices is the main contributor to performance losses, especially in mass transport limiting operating regimes. This is valid for batteries, fuel cells and oxygen transport membranes alike, where tortuosity is used to relate the effective transport properties of diffusion and electric or ionic flux, to its respective bulk property.…”

Section: Introductionmentioning

confidence: 99%

Tortuosity in electrochemical devices: a review of calculation approaches

Tjaden

Brett

Shearing

2016

International Materials Reviews

211

188

View full text Add to dashboard Cite

The tortuosity of a structure plays a vital role in the transport of mass and charge in electrochemical devices. Concentration polarisation losses at high current densities are caused by mass transport limitations and are thus a function of microstructural characteristics. As tortuosity is notoriously difficult to ascertain, a wide and diverse range of methods has been developed to extract the tortuosity of a structure. These methods differ significantly in terms of calculation approach and data preparation techniques. Here, we review tortuosity calculation procedures applied in the field of electrochemical devices to better understand the resulting values presented in the literature. Visible differences between calculation methods are observed, especially when using porosity-tortuosity relationships and when comparing geometric and flux based tortuosity calculation approaches.

show abstract

“…However, the estimation of tortuosity for a porous material is usually subjective. Distinct types of tortuosity, such as geometric, hydraulic, electrical, and diffusive tortuosity have been studied in the literatures [34]. This part of the study aims to compare the tortuosity of water-filled pores between CT-1d and HYMO-1d.…”

Section: Tortuositymentioning

confidence: 99%

Characterization and comparison of capillary pore structures of digital cement pastes

Dong

Gao

2017

Mater Struct

View full text Add to dashboard Cite

More and more studies are based on digital microstructures of cement pastes obtained either by numerical modelling or by experiments. A comprehensive understanding of the their pore structures, therefore, becomes significant. In this study, the pore structure of a virtual cement paste (HYMO-1d) generated by cement hydration model HYMOSTRUC 3D is characterized. The pore structure of HYMO-1d is compared to the one of CT-1d that is reconstructed by using X-ray computed tomography technique (CT scan). Both HYMO-1d and CT-1d have the same porosity. Various parameters are taken into account, viz., the specific surface area, the pore size distribution (PSD), the connectivity and the tortuosity of waterfilled pores. Regarding the PSD, two concepts (i.e., the ''continuous PSD'' and the ''PSD by MIP simulation'') are adopted. The ''continuous PSD'' is believed to be a ''realistic'' PSD; while the ''PSD by MIP simulation'' is affected by the ''throat'' and ''ink bottle'' pores. The results show that HYMO-1d and CT-1d exhibit a similar curve of ''continuous PSD'', but distinct curves of ''PSD by MIP simulation'' and different specific surface areas. A lower complexity of the pore structure of HYMO-1d is indicated by a higher tortuosity of water-filled pores with reference to CT-1d. This study indicates that the comparison of pore structures between the digital microstructures should be based on multiple parameters. It also gives an insight into further studies on digital microstructures, i.e. transport properties of unsaturated materials.

show abstract

Tortuosity in Porous Media: A Critical Review

Cited by 661 publications

References 93 publications

A study on pressure-driven gas transport in porous media: from nanoscale to microscale

A study on pressure-driven gas transport in porous media: from nanoscale to microscale

Tortuosity in electrochemical devices: a review of calculation approaches

Characterization and comparison of capillary pore structures of digital cement pastes

Contact Info

Product

Resources

About