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A composite sphere assemblage model for porous oolitic rocks:Application to thermal conductivity 预览

A composite sphere assemblage model for porous oolitic rocks:Application to thermal conductivity
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摘要 The present work is devoted to the determination of linear effective thermal conductivity of porous rocks characterized by an assemblage of grains (oolites) coated by a matrix. Two distinct classes of pores, i.e. micropores or intra oolitic pores (oolite porosity) and mesopores or inter oolitic pores (inter oolite porosity), are taken into account. The overall porosity is supposed to be connected and decomposed into oolite porosity and matrix porosity. Within the framework of Hashin composite sphere assemblage (CSA)models, a two-step homogenization method is developed. At the first homogenization step, pores are assembled into two layers by using self-consistent scheme (SCS). At the second step, the two porous layers constituting the oolites and the matrix are assembled by using generalized self-consistent scheme (GSCS) and referred to as three-phase model. Numerical results are presented for data representative of a porous oolitic limestone. It is shown that the influence of porosity on the overall thermal conductivity of such materials may be significant. The present work is devoted to the determination of linear effective thermal conductivity of porous rocks characterized by an assemblage of grains(oolites) coated by a matrix. Two distinct classes of pores, i.e.micropores or intra oolitic pores(oolite porosity) and mesopores or inter oolitic pores(inter oolite porosity), are taken into account. The overall porosity is supposed to be connected and decomposed into oolite porosity and matrix porosity. Within the framework of Hashin composite sphere assemblage(CSA)models, a two-step homogenization method is developed. At the first homogenization step, pores are assembled into two layers by using self-consistent scheme(SCS). At the second step, the two porous layers constituting the oolites and the matrix are assembled by using generalized self-consistent scheme(GSCS) and referred to as three-phase model. Numerical results are presented for data representative of a porous oolitic limestone. It is shown that the influence of porosity on the overall thermal conductivity of such materials may be significant.
作者 F. Chen A. Giraud D. Grgic K. Kalo F.Chen;A.Giraud;D.Grgic;K.Kalo;Geo Ressources Laboratory,Université de Lorraine(ENSG), CNRS, CREGU;
出处 《岩石力学与岩土工程学报:英文版》 CSCD 2017年第1期54-61,共8页 Journal of Rock Mechanics and Geotechnical Engineering
基金 support from TAMER (Trans-Atlantic Micromechanics Evolving Research) European Project (materials containing inhomogeneities of diverse physical properties, shapes and orientations) FP7 Project TAMER IRSES-GA2013-610547
关键词 Effective thermal conductivity Three-phase MODEL Oolitic LIMESTONE COMPOSITE SPHERE assemblage (CSA) MODEL Effective thermal conductivity Three-phase model Oolitic limestone Composite sphere assemblage(CSA) model
作者简介 Corresponding author:E-mail address: Albert.Giraud@univ-lorraine.fr
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