Validated a priori calculation of tortuosity in porous materials including sandstone and limestone

Laudone, Giuliano M.; Gribble, Christopher M.; Jones, Katie L.; Collier, Hannah J.; Matthews, G. Peter

doi:10.1016/j.ces.2015.03.043

Cited by 26 publications

(11 citation statements)

References 24 publications

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“…No experimental data could be found for the tortuosity of CaO for comparison. The obtained tortuosity for CaO is of the same order of magnitude as values reported in literature for CaCO 3 45,46 and other similar materials 44 . However,

τ_{{CaCO}_{3}}

is higher than reported values by approximately two orders of magnitude 45,46 .…”

Section: Numerical Modelingsupporting

confidence: 86%

“…The obtained tortuosity for CaO is of the same order of magnitude as values reported in literature for CaCO 3 45,46 and other similar materials 44 . However,

τ_{{CaCO}_{3}}

is higher than reported values by approximately two orders of magnitude 45,46 . This value of

τ_{{CaCO}_{3}}

suggests there may be other mechanisms inhibiting diffusion of CO 2 through CaCO 3 that are not accounted for by the model.…”

Section: Numerical Modelingsupporting

confidence: 86%

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Thermal transport and chemical conversion in single reacting sorbent particles

2021

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The effects of particle size and carbon dioxide concentration on chemical conversion in engineered spherical particles undergoing calcium oxide looping are investigated. Particles are thermochemically cycled in a furnace under different carbon dioxide concentrations. Changes in composition due to chemical reactions are measured using thermogravimetric analysis. Gas composition at the furnace exit is evaluated with mass spectroscopy. A numerical model of thermal transport phenomena developed previously is adapted to match the physical system investigated in the present study. The model is used to elucidate effects of reacting medium characteristics on particle temperature and reaction extent. Experimental and numerical results show that (1) an increase in particle size results in a decrease in carbonation extent, and (2) the carbonation step consists of fast and slow reaction regimes. The reaction rates in the fast and slow carbonation regimes increase with increasing carbon dioxide concentration. The effect of carbon dioxide concentration and the distinction between the fast and slow regimes become more pronounced with increasing particle size.

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τ_{{CaCO}_{3}}

is higher than reported values by approximately two orders of magnitude 45,46 .…”

Section: Numerical Modelingsupporting

confidence: 86%

“…The obtained tortuosity for CaO is of the same order of magnitude as values reported in literature for CaCO 3 45,46 and other similar materials 44 . However,

τ_{{CaCO}_{3}}

is higher than reported values by approximately two orders of magnitude 45,46 . This value of

τ_{{CaCO}_{3}}

suggests there may be other mechanisms inhibiting diffusion of CO 2 through CaCO 3 that are not accounted for by the model.…”

Section: Numerical Modelingsupporting

confidence: 86%

Thermal transport and chemical conversion in single reacting sorbent particles

2021

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“…Ref. 19 ) which can also evaluate tortuosity. It would be interesting to compare near percolation routes of AP in the present model (e.g., the route in Fig.…”

Section: Discussionmentioning

confidence: 99%

Percolation and tortuosity in heart-like cells

Rabinovitch¹,

Biton

Braunstein

et al. 2021

Sci Rep

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In the last several years, quite a few papers on the joint question of transport, tortuosity and percolation have appeared in the literature, dealing with passage of miscellaneous liquids or electrical currents in different media. However, these methods have not been applied to the passage of action potential in heart fibrosis (HF), which is crucial for problems of heart arrhythmia, especially of atrial tachycardia and fibrillation. In this work we address the HF problem from these aspects. A cellular automaton model is used to analyze percolation and transport of a distributed-fibrosis inflicted heart-like tissue. Although based on a rather simple mathematical model, it leads to several important outcomes: (1) It is shown that, for a single wave front (as the one emanated by the heart's sinus node), the percolation of heart-like matrices is exactly similar to the forest fire case. (2) It is shown that, on the average, the shape of the transport (a question not dealt with in relation to forest fire, and deals with the delay of action potential when passing a fibrotic tissue) behaves like a Gaussian. (3) Moreover, it is shown that close to the percolation threshold the parameters of this Gaussian behave in a critical way. From the physical point of view, these three results are an important contribution to the general percolation investigation. The relevance of our results to cardiological issues, specifically to the question of reentry initiation, are discussed and it is shown that: (A) Without an ectopic source and under a mere sinus node operation, no arrhythmia is generated, and (B) A sufficiently high refractory period could prevent some reentry mechanisms, even in partially fibrotic heart tissue.

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“…Donde L es la longitud aparente del material poroso (coincidente con el espesor de la membrana ∆x) y Leff es la longitud media del camino recorrido por el fluido a través de la matriz porosa [135]. Así, la tortuosidad es un parámetro que indica una propiedad macroscópica de la sinuosidad del recorrido del flujo y la variación del tamaño de poro a lo largo del recorrido del flujo, así como de su forma y conectividad.…”

Section: Ecunclassified

“…Sin embargo, estos enfoques estarían limitados por la resolución y precisión de los métodos; además, la tortuosidad calculada dependería en gran medida de las suposiciones realizadas sobre la conectividad observada en la red porosa [135]. De este modo, la medida directa de la tortuosidad implica una gran dificultad, por lo que para su medida indirecta se han empleado diversas metodologías.…”

Section: Figura 15 Ejemplos De Estructuras Porosas Con Diferentes Tounclassified

Membranas cerámicas de bajo coste para el tratamiento de aguas residuales

Ayza¹,

Magdalena²

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Validated a priori calculation of tortuosity in porous materials including sandstone and limestone

Cited by 26 publications

References 24 publications

Thermal transport and chemical conversion in single reacting sorbent particles

Thermal transport and chemical conversion in single reacting sorbent particles

Percolation and tortuosity in heart-like cells

Membranas cerámicas de bajo coste para el tratamiento de aguas residuales

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