The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
A. Revil - One of the best experts on this subject based on the ideXlab platform.
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Thermal Conductivity of unsaturated clay-rocks
Hydrology and Earth System Sciences Discussions, 2010Co-Authors: D. Jougnot, A. RevilAbstract:The parameters used to describe the electrical Conductivity of a porous material can be used to describe also its Thermal Conductivity. A new relationship is developed to connect the Thermal Conductivity of an unsaturated porous material to the Thermal Conductivity of the different phases of the composite, and two electrical parameters called the first and second Archie's exponents. A good agreement is obtained between the new model and Thermal Conductivity measurements performed using packs of glass beads and core samples of the Callovo-Oxfordian clay-rocks at different saturations of the water phase. We showed that the three model parameters optimised to fit the new model against experimental data (namely the Thermal Conductivity of the solid phase and the two Archie's exponents) are consistent with independent estimates. We also observed that the anisotropy of the effective Thermal Conductivity of the Callovo-Oxfordian clay-rock was mainly due to the anisotropy of the Thermal Conductivity of the solid phase.
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Thermal Conductivity of unsaturated clay-rocks
Hydrology and Earth System Sciences Discussions, 2008Co-Authors: D. Jougnot, A. RevilAbstract:Abstract. The Thermal Conductivity of porous materials can be related to the electrical Conductivity and therefore electrical resistivity tomography can be used to map the Thermal Conductivity of porous rocks. In this paper, a relationship is developed to connect the Thermal Conductivity of unsaturated clay-rocks to the Thermal Conductivity of the different phases of the porous composite, a textural parameter called the Thermal formation factor, and the tortuosity of the water phase. The Thermal formation factor is related to the electrical formation factor and to the first Archie's first exponent m. The tortuosity of the water phase is related to the second Archie's exponent n and to the relative saturation of the water phase. A very good agreement is obtained between the new model and Thermal Conductivity measurements of packs of glass beads and cores of the Callovo-Oxfordian argillite at different saturations of the water phase. Anisotropy of the effective Thermal Conductivity is mainly due to the anisotropy of the Thermal Conductivity of the solid phase.
Administrator Os - One of the best experts on this subject based on the ideXlab platform.
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Registration - C-Therm - Thermal Conductivity Instruments
2017Co-Authors: Administrator OsAbstract:Registration - C-Therm - Thermal Conductivity Instruments - Simplifying Thermal Conductivity and Thermal effusivity analysis with the patented Modified Transient Plane Source technique.
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Accessories - C-Therm - Thermal Conductivity Instruments
2016Co-Authors: Administrator OsAbstract:Accessories - C-Therm - Thermal Conductivity Instruments - Simplifying Thermal Conductivity and Thermal effusivity analysis with the patented Modified Transient Plane Source technique.
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Blog - C-Therm - Thermal Conductivity Instruments
2016Co-Authors: Administrator OsAbstract:Blog - C-Therm - Thermal Conductivity Instruments - Simplifying Thermal Conductivity and Thermal effusivity analysis with the patented Modified Transient Plane Source technique.
Urs T. Gonzenbach - One of the best experts on this subject based on the ideXlab platform.
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Thermal Conductivity of porous materials
International Journal of Materials Research, 2013Co-Authors: David S. Smith, Julie Bourret, Kodai Otsu, Pierre Elser, Fabienne Pennec, Benoît Nait-ali, Arnaud Alzina, Hideaki Matsubara, Nicolas Tessier-doyen, Urs T. GonzenbachAbstract:Incorporation of porosity into a monolithic material decreases the effective Thermal Conductivity. Porous ceramics were prepared by different methods to achieve pore volume fractions from 4 to 95%. A toolbox of analytical relations is proposed to describe the effective Thermal Conductivity as a function of solid phase Thermal Conductivity, pore Thermal Conductivity, and pore volume fraction (νp). For νp < 0.65, the Maxwell–Eucken relation for closed porosity and Landauer relation for open porosity give good agreement to experimental data on tin oxide, alumina, and zirconia ceramics. For νp > 0.65, the Thermal Conductivity of kaolin-based foams and calcium aluminate foams was well described by the Hashin Shtrikman upper bound and Russell’s relation. Finally, numerical simulation on artificially generated microstructures yields accurate predictions of Thermal Conductivity when fine detail of the spatial distribution of the phases needs to be accounted for, as demonstrated with a bio-aggregate material.
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Thermal Conductivity of porous materials
Journal of Materials Research, 2013Co-Authors: David S. Smith, Julie Bourret, Kodai Otsu, Pierre Elser, Fabienne Pennec, Benoît Nait-ali, Arnaud Alzina, Hideaki Matsubara, Nicolas Tessier-doyen, Urs T. GonzenbachAbstract:ABSTRACT Incorporation of porosity into a monolithic material decreases the effective Thermal Conductivity. Porous ceramics were prepared by different methods to achieve pore volume fractions from 4 to 95%. A toolbox of analytical relations is proposed to describe the effective Thermal Conductivity as a function of solid phase Thermal Conductivity, pore Thermal Conductivity, and pore volume fraction (νp). For νp 0.65, the Thermal Conductivity of kaolin-based foams and calcium aluminate foams was well described by the Hashin Shtrikman upper bound and Russell’s relation. Finally, numerical simulation on artificially generated microstructures yields accurate predictions of Thermal Conductivity when fine detail of the spatial distribution of the phases needs to be accounted for, as demonstrated with a bio-aggregate material.
Lukas Steinman - One of the best experts on this subject based on the ideXlab platform.
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Thermal Conductivity Module - C-Therm - Thermal Conductivity Instruments
2015Co-Authors: Lukas SteinmanAbstract:Thermal Conductivity Module - C-Therm - Thermal Conductivity Instruments - Simplifying Thermal Conductivity and Thermal effusivity analysis with the patented Modified Transient Plane Source technique.
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Specifications - C-Therm - Thermal Conductivity Instruments
2015Co-Authors: Lukas SteinmanAbstract:Applications - C-Therm - Thermal Conductivity Instruments - Simplifying Thermal Conductivity and Thermal effusivity analysis with the patented Modified Transient Plane Source technique.
D. Jougnot - One of the best experts on this subject based on the ideXlab platform.
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Thermal Conductivity of unsaturated clay-rocks
Hydrology and Earth System Sciences Discussions, 2010Co-Authors: D. Jougnot, A. RevilAbstract:The parameters used to describe the electrical Conductivity of a porous material can be used to describe also its Thermal Conductivity. A new relationship is developed to connect the Thermal Conductivity of an unsaturated porous material to the Thermal Conductivity of the different phases of the composite, and two electrical parameters called the first and second Archie's exponents. A good agreement is obtained between the new model and Thermal Conductivity measurements performed using packs of glass beads and core samples of the Callovo-Oxfordian clay-rocks at different saturations of the water phase. We showed that the three model parameters optimised to fit the new model against experimental data (namely the Thermal Conductivity of the solid phase and the two Archie's exponents) are consistent with independent estimates. We also observed that the anisotropy of the effective Thermal Conductivity of the Callovo-Oxfordian clay-rock was mainly due to the anisotropy of the Thermal Conductivity of the solid phase.
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Thermal Conductivity of unsaturated clay-rocks
Hydrology and Earth System Sciences Discussions, 2008Co-Authors: D. Jougnot, A. RevilAbstract:Abstract. The Thermal Conductivity of porous materials can be related to the electrical Conductivity and therefore electrical resistivity tomography can be used to map the Thermal Conductivity of porous rocks. In this paper, a relationship is developed to connect the Thermal Conductivity of unsaturated clay-rocks to the Thermal Conductivity of the different phases of the porous composite, a textural parameter called the Thermal formation factor, and the tortuosity of the water phase. The Thermal formation factor is related to the electrical formation factor and to the first Archie's first exponent m. The tortuosity of the water phase is related to the second Archie's exponent n and to the relative saturation of the water phase. A very good agreement is obtained between the new model and Thermal Conductivity measurements of packs of glass beads and cores of the Callovo-Oxfordian argillite at different saturations of the water phase. Anisotropy of the effective Thermal Conductivity is mainly due to the anisotropy of the Thermal Conductivity of the solid phase.
