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Measurement of gas diffusion coefficient in highly permeable porous media
Year:
2019
Source of publication :
Vadose Zone Journal
Authors :
Kamai, Tamir
;
.
Volume :
1
Co-Authors:

Levintal, E., Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion Univ. of the Negev, Israel; Dragila, M.I., Dep. of Crop and Soil Science, Oregon State Univ, Corvallis, OR  97331, United States;  Weisbrod, N., Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion Univ. of the Negev, Israel

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Gas diffusion is a fundamental transport process in porous media. However, to date, there is no method for experimentally estimating the gas diffusion coefficient of coarse porous media. A modified method is proposed here and was validated against sand media. The method was tested using particle sizes ranging between 1 and 4 cm: ~10-3 cm2 < intrinsic permeability < ~10-2 cm2. Laboratory experiments were conducted in large horizontal columns filled with different homogeneous spherical particles inside a climate-controlled laboratory under isothermal (± <0.2°C) and windless conditions. Diffusion coefficients were similar for particles sizes of 1 and 2 cm, which indicates that pure diffusion governs gas transport. Above 2 cm, diffusion coefficients were higher, suggesting an enhanced gas transport, most likely initiated by small, local advective components. Because the enhanced transport can be modeled by the diffusion equation using a larger diffusion coefficient, it is associated with the enhanced diffusion concept.

Note:
Related Files :
Enhanced transports
Gases
Laboratory experiments
Porous materials
transport process
Transport Processes
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Related Content
More details
DOI :
10.2136/vzj2018.08.0164
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
41904
Last updated date:
02/03/2022 17:27
Creation date:
26/06/2019 11:13
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Scientific Publication
Measurement of gas diffusion coefficient in highly permeable porous media
1

Levintal, E., Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion Univ. of the Negev, Israel; Dragila, M.I., Dep. of Crop and Soil Science, Oregon State Univ, Corvallis, OR  97331, United States;  Weisbrod, N., Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion Univ. of the Negev, Israel

Measurement of gas diffusion coefficient in highly permeable porous media

Gas diffusion is a fundamental transport process in porous media. However, to date, there is no method for experimentally estimating the gas diffusion coefficient of coarse porous media. A modified method is proposed here and was validated against sand media. The method was tested using particle sizes ranging between 1 and 4 cm: ~10-3 cm2 < intrinsic permeability < ~10-2 cm2. Laboratory experiments were conducted in large horizontal columns filled with different homogeneous spherical particles inside a climate-controlled laboratory under isothermal (± <0.2°C) and windless conditions. Diffusion coefficients were similar for particles sizes of 1 and 2 cm, which indicates that pure diffusion governs gas transport. Above 2 cm, diffusion coefficients were higher, suggesting an enhanced gas transport, most likely initiated by small, local advective components. Because the enhanced transport can be modeled by the diffusion equation using a larger diffusion coefficient, it is associated with the enhanced diffusion concept.

Scientific Publication
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