Evaluation of Moisture Diffusivity from Pore Distribution Curves for a Ceramic Brick

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F24%3A00376065" target="_blank" >RIV/68407700:21110/24:00376065 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s10765-024-03376-6" target="_blank" >https://doi.org/10.1007/s10765-024-03376-6</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10765-024-03376-6" target="_blank" >10.1007/s10765-024-03376-6</a>

Result language
angličtina
Original language name
Evaluation of Moisture Diffusivity from Pore Distribution Curves for a Ceramic Brick
Original language description
The 1D moisture diffusivity of porous materials may strongly depend on the content of moisture in the materials, varying over an order of magnitude or more. In this paper we present a new model from which the diffusivity can be evaluated, using the pore size distribution and water absorption coefficient. We point out that this is a more efficient approach than the standard Boltzmann–Matano (BM) method, because measurements of pore curves and water absorption are much shorter and rather accurate compared to moisture profile experiments needed in the BM method. As an example, we apply our model to two samples of a ceramic brick for which experimental data on both pore curves and moisture profiles had been measured. A very good quantitative agreement in the diffusivity is obtained for early stage profiles. For later stages, however, the model predicts three to four times higher diffusivity than the BM method. The reasons for this discrepancy are discussed and further tasks to validate the effectiveness of the new model are proposed. We also compare our model with the pore models of Burdine and Mualem.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/GA22-03474S" target="_blank" >GA22-03474S: Mass transfer in porous construction materials suitable for application in nuclear waste repositories</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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