Effect of a varying moisture diffusivity in the transport of gadolinium in a porous material

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00339279" target="_blank" >RIV/68407700:21110/19:00339279 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/19:00339279

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.5120156" target="_blank" >http://dx.doi.org/10.1063/1.5120156</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5120156" target="_blank" >10.1063/1.5120156</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of a varying moisture diffusivity in the transport of gadolinium in a porous material

Popis výsledku v původním jazyce

Models of salts transport in porous media with constant diffusion parameters are known to usually fail to match experimental data. On the other hand, diffusivities depending on the moisture or salts concentrations can reproduce the data with good accuracy. In this paper we assess the effect of the water content dependence of the moisture diffusivity in the transport of gadolinium in a dry cement based composite investigated by neutron imaging. Such composites are planned to be an essential part of the multi-barrier systems in nuclear waste management, and their use for this purpose requires detailed studies of their transport properties. We interpret experimental data on the gadolinium transport using an advection-diffusion model of Bear and Bachmat in which sorption is described by a linear isotherm. The optimization of model parameters is based on the Levenberg-Marquardt method. We find that the difference between the results for the constant and varying moisture diffusivities is small, both yielding large discrepancies with respect to the data.

Název v anglickém jazyce

Effect of a varying moisture diffusivity in the transport of gadolinium in a porous material

Popis výsledku anglicky

Models of salts transport in porous media with constant diffusion parameters are known to usually fail to match experimental data. On the other hand, diffusivities depending on the moisture or salts concentrations can reproduce the data with good accuracy. In this paper we assess the effect of the water content dependence of the moisture diffusivity in the transport of gadolinium in a dry cement based composite investigated by neutron imaging. Such composites are planned to be an essential part of the multi-barrier systems in nuclear waste management, and their use for this purpose requires detailed studies of their transport properties. We interpret experimental data on the gadolinium transport using an advection-diffusion model of Bear and Bachmat in which sorption is described by a linear isotherm. The optimization of model parameters is based on the Levenberg-Marquardt method. We find that the difference between the results for the constant and varying moisture diffusivities is small, both yielding large discrepancies with respect to the data.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA17-11635S" target="_blank" >GA17-11635S: Cementové kompozity k imobilizaci radionuklidů</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Central European Symposium on Thermophysics 2019 (CEST)

ISBN

978-0-7354-1876-9

ISSN

—

e-ISSN

—

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

AIP Conference Proceedings

Místo vydání

New York

Místo konání akce

Banská Bystrica, Slovakia

Datum konání akce

16. 10. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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