Double porosity model to describe both permeability change and dissolution processes

Cement is a practical material for constructing the geological disposal system of radioactive wastes. The dynamic behavior of both permeability change and dissolution process caused by a high pH groundwater was explained using a double porosity model assuming that each packed particle consists of th...

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Autores principales:	Yuichi NIIBORI, Hideo USUI, Taiji CHIDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	geological disposal radioactive waste cement materials groundwater permeability dissolution diffusion porosity Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a90d6e8fda0f44b5a9920039e9f221ea
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spelling	oai:doaj.org-article:a90d6e8fda0f44b5a9920039e9f221ea2021-11-26T06:30:10ZDouble porosity model to describe both permeability change and dissolution processes2187-974510.1299/mej.15-00210https://doaj.org/article/a90d6e8fda0f44b5a9920039e9f221ea2015-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/5/2_15-00210/_pdf/-char/enhttps://doaj.org/toc/2187-9745Cement is a practical material for constructing the geological disposal system of radioactive wastes. The dynamic behavior of both permeability change and dissolution process caused by a high pH groundwater was explained using a double porosity model assuming that each packed particle consists of the sphere-shaped aggregation of smaller particles. This model assumes two kinds of porosities between the particle clusters and between the particles, where the former porosity change mainly controls the permeability change of the bed, and the latter porosity change controls the diffusion of OH- ions inducing the dissolution of silica. The fundamental equations consist of a diffusion equation of spherical coordinates of OH- ions including the first-order reaction term and some equations describing the size changes of both the particles and the particle clusters with time. The change of over-all permeability of the packed bed is evaluated by Kozeny-Carman equation and the calculated radii of particle clusters. The calculated result well describes the experimental result of both permeability change and dissolution processes.Yuichi NIIBORIHideo USUITaiji CHIDAThe Japan Society of Mechanical Engineersarticlegeological disposalradioactive wastecement materialsgroundwaterpermeabilitydissolutiondiffusionporosityMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 5, Pp 15-00210-15-00210 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	geological disposal radioactive waste cement materials groundwater permeability dissolution diffusion porosity Mechanical engineering and machinery TJ1-1570
spellingShingle	geological disposal radioactive waste cement materials groundwater permeability dissolution diffusion porosity Mechanical engineering and machinery TJ1-1570 Yuichi NIIBORI Hideo USUI Taiji CHIDA Double porosity model to describe both permeability change and dissolution processes
description	Cement is a practical material for constructing the geological disposal system of radioactive wastes. The dynamic behavior of both permeability change and dissolution process caused by a high pH groundwater was explained using a double porosity model assuming that each packed particle consists of the sphere-shaped aggregation of smaller particles. This model assumes two kinds of porosities between the particle clusters and between the particles, where the former porosity change mainly controls the permeability change of the bed, and the latter porosity change controls the diffusion of OH- ions inducing the dissolution of silica. The fundamental equations consist of a diffusion equation of spherical coordinates of OH- ions including the first-order reaction term and some equations describing the size changes of both the particles and the particle clusters with time. The change of over-all permeability of the packed bed is evaluated by Kozeny-Carman equation and the calculated radii of particle clusters. The calculated result well describes the experimental result of both permeability change and dissolution processes.
format	article
author	Yuichi NIIBORI Hideo USUI Taiji CHIDA
author_facet	Yuichi NIIBORI Hideo USUI Taiji CHIDA
author_sort	Yuichi NIIBORI
title	Double porosity model to describe both permeability change and dissolution processes
title_short	Double porosity model to describe both permeability change and dissolution processes
title_full	Double porosity model to describe both permeability change and dissolution processes
title_fullStr	Double porosity model to describe both permeability change and dissolution processes
title_full_unstemmed	Double porosity model to describe both permeability change and dissolution processes
title_sort	double porosity model to describe both permeability change and dissolution processes
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/a90d6e8fda0f44b5a9920039e9f221ea
work_keys_str_mv	AT yuichiniibori doubleporositymodeltodescribebothpermeabilitychangeanddissolutionprocesses AT hideousui doubleporositymodeltodescribebothpermeabilitychangeanddissolutionprocesses AT taijichida doubleporositymodeltodescribebothpermeabilitychangeanddissolutionprocesses
_version_	1718409800112406528

Double porosity model to describe both permeability change and dissolution processes

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