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A neutron Radiography Study of the Movement of Thin Layers of Water in a Porous Building Brick |
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PP: 105-110 |
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Author(s) |
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Y. M. Abbas,
A. Abo-Elmaaty,
E. Hamad,
A. El Abd,
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Abstract |
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| This study examined the isothermal water absorption within an internally produced gap in a brick sample. This investigation was conducted at the 14th beam line of the IBR-2 reactor, located at the Joint Institute of Nuclear Research in Dubna, Russia, utilizing a real-time neutron radiography station. The gap was created as a result of subjecting a brick sample to hydrophobic surface treatment. During the process of absorption, regular intervals were used to obtain images of neutron radiography. The water content, θ, and the water profiles θ(x,t) along the flow direction, x, were obtained from neutron radiography images. Additionally, the evolution of the waterfront position as a function of the absorption time, t, was determined. The second Ficks law of diffusion was used to discuss the results. It was demonstrated that the position of the waterfront followed approximately the t1/2 -scaling and the θ (x,t) profiles in terms of the Boltzmann scaling (φ =x/t1/2) converged to a universal one master curve at high absorption time. It was shown that the water absorption process showed anomalous behavior. Anomalous diffusion approaches based on the modification of Ficks law were used to model the results. It was demonstrated that the anomalous diffusion described the results better than the classical one. It was demonstrated that neutron radiography is an effective tool for probing the absorption of thin water layers. |
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