Role of Small and Large Pores in Modeling of Moisture Diffusivity of Ceramic Bricks

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F23%3A00371813" target="_blank" >RIV/68407700:21110/23:00371813 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1063/5.0171050" target="_blank" >https://doi.org/10.1063/5.0171050</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0171050" target="_blank" >10.1063/5.0171050</a>

Result language

angličtina

Original language name

Role of Small and Large Pores in Modeling of Moisture Diffusivity of Ceramic Bricks

Original language description

The dependence of moisture diffusion coefficients on moisture content can be modeled using pore size distribution curves. This seems to be a very convenient approach, because the curves can be readily measured by standard experimental techniques. On the other hand, the Boltzmann-Matano approach requires time consuming measurements of the moisture profile to determine the moisture diffusivity. Using two samples of a ceramic brick, in this paper we demonstrate that there are two serious limitations in the former approach that employs pore size distribution curves. Namely, an independent determination of a single value of the diffusivity and inadequate (oscillating) behavior of the diffusivity at low and high moisture contents. We address both limitations as follows. First, a single value of the diffusivity may be determined from water absorption coefficient. However, this value corresponds to a moisture content quite close to the saturation point where the result may be rather questionable. Second, by using pore size distributions curves with cut-offs at small and large pores, the behavior of the moisture diffusivity becomes plausible, without any oscillations. This indicates that parts of pore curves at small and large pores may require more careful treatment in the experimental determination and/or corrections in theoretical models.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20504 - Ceramics

Project

<a href="/en/project/GA20-01536S" target="_blank" >GA20-01536S: Controlled modification of mineralogical composition of ceramic body for improvement of its utility properties</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

AIP Conference Proceedings

ISBN

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ISSN

1551-7616

e-ISSN

1551-7616

Number of pages

7

Pages from-to

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Publisher name

AIP Publishing, APL, the American Institute of Physics

Place of publication

Melville, NY

Event location

Bratislava

Event date

Sep 5, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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