Comparison of Wicke–Kallenbach and Graham's diffusion cells for obtaining transport characteristics of porous solids

Soukup, Karel; Schneider, P.; Šolcová, Olga

doi:10.1016/j.ces.2007.10.032

Cited by 32 publications

(20 citation statements)

References 19 publications

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“…However, measurements with these cells require strictly isobaric conditions in cell compartments. Soukup et al [2008] indicated that even a small pressure difference (7-9 Pa) can lead to a significant diffusion flux deviation for samples with pores larger than 7 mm. This can be problematic for geological porous media having pores larger than 7 mm, while it is challenging to achieve a strict isobaric condition.…”

Section: Introductionmentioning

confidence: 99%

Diffusivity of rocks: Gas diffusion measurements and correlation to porosity and pore size distribution

Peng

Hamamoto

2012

Water Resources Research

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[1] Diffusivity was measured for 12 rock and construction material samples using a diffusion chamber method with oxygen as the tracer gas. Several steps were implemented to minimize leakage between the sample and the core holder, and rigorous tests were performed to evaluate and correct the overall leakage of the diffusion apparatus. This method was proven capable of rapidly measuring the diffusion coefficient for consolidated samples having dimensionless diffusivity values greater than 4.7 Â 10 À4 in a relative short duration (hours to 1 day). Gas diffusion measurements were also conducted for 11 repacked sediments and sands. Our results are consistent with literature data from liquid tracer through-diffusion methods; the diffusivity versus porosity relationship for our data can be described by Archie's law. The m value in Archie's law was found to be correlated to pore size: the finer the pore size is, the larger the m value is. A linear regression equation can describe the change of m with ln d 50 (the volumetric mean pore diameter) for most rocks with d 50 < 1.3 mm, while the outliers can be correlated to narrower pore size distribution.Citation: Peng, S., Q. Hu, and S. Hamamoto (2012), Diffusivity of rocks: Gas diffusion measurements and correlation to porosity and pore size distribution, Water Resour.

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Section: Introductionmentioning

confidence: 99%

Diffusivity of rocks: Gas diffusion measurements and correlation to porosity and pore size distribution

Peng

Hamamoto

2012

Water Resources Research

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“…In the absence of this information, effective transport properties of porous structures have been derived experimentally by means of diffusion cell experiments 16,17,[64][65][66][67][68][69][70] and electrochemical measurements. 15,19,46,71 …”

Section: Experimentally Derived Tortuositymentioning

confidence: 99%

Tortuosity in electrochemical devices: a review of calculation approaches

Tjaden

Brett

Shearing

2016

International Materials Reviews

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188

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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.

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“…Their textural properties (Table 1) were determined by mercury porosimetry (AutoPore III, Micromeritics, USA) and helium pycnometry (AccuPyc 1330, Micromeritics, USA). The experimental set-up of both diffusion cells is described in Soukup et al (2008).…”

Section: Methodsmentioning

confidence: 99%

“…From our recent results (Soukup et al, 2008) it appeared that tiny pressure differences (of the order of several Pascals) are unavoidably present even under cautious experimental conditions. For porous solids this pressure difference is a source of additional gas transport mechanism-permeation.…”

Section: Introductionmentioning

confidence: 98%

Wicke–Kallenbach and Graham's diffusion cells: Limits of application for low surface area porous solids

Soukup

Schneider

Šolcová

2008

Chemical Engineering Science

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Comparison of Wicke–Kallenbach and Graham's diffusion cells for obtaining transport characteristics of porous solids

Cited by 32 publications

References 19 publications

Diffusivity of rocks: Gas diffusion measurements and correlation to porosity and pore size distribution

Diffusivity of rocks: Gas diffusion measurements and correlation to porosity and pore size distribution

Tortuosity in electrochemical devices: a review of calculation approaches

Wicke–Kallenbach and Graham's diffusion cells: Limits of application for low surface area porous solids

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