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Studies on water transport in quasi two-dimensional porous systems using neutron radiography

Izabela M. Fijał-Kirejczyk

Izabela M. Fijał-Kirejczyk

National Centre for Nuclear ResearchOtwock, Poland
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Fijał-Kirejczyk, Izabela M.
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Massimo Rogante

Massimo Rogante

Rogante Engineering OfficeItaly
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Rogante, Massimo
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Jacek J. Milczarek

Jacek J. Milczarek

National Centre for Nuclear ResearchOtwock, Poland
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Milczarek, Jacek J.
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Joanna Żołądek-Nowak

Joanna Żołądek-Nowak

National Centre for Nuclear ResearchOtwock, Poland
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Żołądek-Nowak, Joanna
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Zdzisław Jurkowski

Zdzisław Jurkowski

National Centre for Nuclear ResearchOtwock, Poland
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Jurkowski, Zdzisław
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Jan Żołądek

Jan Żołądek

National Centre for Nuclear ResearchOtwock, Poland
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Żołądek, Jan
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Dariusz Rusinek

Dariusz Rusinek

National Centre for Nuclear ResearchOtwock, Poland
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Rusinek, Dariusz
  
Dec 05, 2021
Studies on water transport in quasi two-dimensional porous systems using neutron radiography's Cover Image
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Article Category: Original Paper
Published Online: Dec 05, 2021
Page range: 3 - 9
Received: Jun 23, 2020
Accepted: Sep 10, 2021
DOI: https://doi.org/10.2478/nuka-2021-0034
Keywords
© 2021 Izabela M. Fijał-Kirejczyk et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

A picture of the fabric sample spanned on the aluminium frame. The w and h denote the sample width and length, respectively.
A picture of the fabric sample spanned on the aluminium frame. The w and h denote the sample width and length, respectively.

Fig. 2

The spatial arrangement of the sample position in the NGRS radiography facility.
The spatial arrangement of the sample position in the NGRS radiography facility.

Fig. 3

The neutron images of wetting of synthetic fabric sample (a) before processing, (b) after subtraction of the black current and division by the dry sample image (with linear greyscale), (c) after reduction of the greyscale, histogram stretching and binarization.
The neutron images of wetting of synthetic fabric sample (a) before processing, (b) after subtraction of the black current and division by the dry sample image (with linear greyscale), (c) after reduction of the greyscale, histogram stretching and binarization.

Fig. 4

Binarized (to reveal the waterfront for the naked eye) neutron radiography images sequence delineating the water wetting of a synthetic fabric. The black and white areas correspond to the water-saturated and dry regions, respectively. The values at the bottom indicate the time elapsed since the moment of contact of the sample lower end with water.
Binarized (to reveal the waterfront for the naked eye) neutron radiography images sequence delineating the water wetting of a synthetic fabric. The black and white areas correspond to the water-saturated and dry regions, respectively. The values at the bottom indicate the time elapsed since the moment of contact of the sample lower end with water.

Fig. 5

The dependence of the optical density (negative logarithm of the average brightness) on the distance from the water-immersed, lower end of the sample of synthetic fabric. The solid horizontal line represents the assumed threshold value of 0.01 that determines the wetting front position.
The dependence of the optical density (negative logarithm of the average brightness) on the distance from the water-immersed, lower end of the sample of synthetic fabric. The solid horizontal line represents the assumed threshold value of 0.01 that determines the wetting front position.

Fig. 6

The dependence of the average optical density of the sample image on the average surface mass density of the water for drying of the synthetic fabric.
The dependence of the average optical density of the sample image on the average surface mass density of the water for drying of the synthetic fabric.

Fig. 7

The logarithmic plot of the wetting front distance from the water immersed end of the cotton, linen and synthetic fabrics on time. The numbers are the fitted values of α exponents as explained in the text.
The logarithmic plot of the wetting front distance from the water immersed end of the cotton, linen and synthetic fabrics on time. The numbers are the fitted values of α exponents as explained in the text.

Fig. 8

The dependence of the average optical density and the generalized variable ϕ = xt−α for wetting of linen (a), cotton (b) and synthetic (c) fibre textile.
The dependence of the average optical density and the generalized variable ϕ = xt−α for wetting of linen (a), cotton (b) and synthetic (c) fibre textile.
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