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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GA20-01536S" target="_blank" >GA20-01536S: Řízená modifikace mineralogického složení keramického střepu za účelem zlepšení jeho užitných vlastností</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

AIP Conference Proceedings

ISBN

—

ISSN

1551-7616

e-ISSN

1551-7616

Počet stran výsledku

7

Strana od-do

—

Název nakladatele

AIP Publishing, APL, the American Institute of Physics

Místo vydání

Melville, NY

Místo konání akce

Bratislava

Datum konání akce

5. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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