The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Hiroshi Okabe - One of the best experts on this subject based on the ideXlab platform.
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geologic core holder with a cfr peek body for the x ray ct based numerical analysis of Fracture Flow under confining pressure
Rock Mechanics and Rock Engineering, 2013Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Noriyoshi Tsuchiya, Hiroshi OkabeAbstract:Variables A Cross-sectional area of the model (L) a Local aperture of the Fracture (L) ai Aperture at the ith voxel (L) CTVi CT value at the ith voxel (Hounsfield unit) f Correction factor for the cubic law equation k Permeability of the model (L) L Length of the model (L) N Total number of voxels P Pressure of the fluid (MLT) DP Pressure difference (MLT) Q Total Flow rate (LT) W Local width of the Fracture (L)
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x ray ct based numerical analysis of Fracture Flow for core samples under various confining pressures
Engineering Geology, 2011Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Nobuo Hirano, Hiroshi Okabe, Noriyoshi TsuchiyaAbstract:Abstract The X-ray CT based numerical analysis of Fracture Flow for core samples, recently developed by the authors, was applied to two granite core samples having either a mated artificial or a mated natural Fracture at confining pressures of 5 to 50 MPa. A third-generation medical X-ray CT scanner was used to image the samples within a core holder consisting of an aluminum liner and a carbon fiber overwrap. Fracture models (i.e., aperture distributions) were obtained by the CT images, the resolution of which was coarser than the apertures, and a single-phase Flow simulation was performed using a local cubic law-based Fracture Flow model. Numerical results were evaluated by a Fracture porosity measurement and a solution displacement experiment using NaCl and NaI aqueous solutions. These numerical results coincided only qualitatively with the experimental results, primarily due to image noise from the aluminum liner of the core holder. Nevertheless, the numerical results revealed Flow paths within the Fractures and their changes with confining pressure, whereas the experimental results did not provide such results. Different stress-dependencies in the Flow paths were observed between the two samples despite the similar stress-dependency in Fracture porosity and permeability. The changes in total area of the Flow paths with confining pressure coincided qualitatively with changes in breakthrough points in the solution displacement experiment. Although the data is limited, the results of the present study suggest the importance of analyzing fluid Flows within naturally Fractured core samples under in situ conditions in order to better understand the Fracture Flow characteristics in a specific field. As demonstrated herein, X-ray CT-based numerical analysis is effective for addressing this concern. Using a multi-phase Flow model, as well as a core holder constructed of an engineered plastic, should provide a useful, non-destructive, and non-contaminative X-ray CT-based Fracture Flow analysis for core samples under in situ conditions in future studies.
Noriaki Watanabe - One of the best experts on this subject based on the ideXlab platform.
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geologic core holder with a cfr peek body for the x ray ct based numerical analysis of Fracture Flow under confining pressure
Rock Mechanics and Rock Engineering, 2013Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Noriyoshi Tsuchiya, Hiroshi OkabeAbstract:Variables A Cross-sectional area of the model (L) a Local aperture of the Fracture (L) ai Aperture at the ith voxel (L) CTVi CT value at the ith voxel (Hounsfield unit) f Correction factor for the cubic law equation k Permeability of the model (L) L Length of the model (L) N Total number of voxels P Pressure of the fluid (MLT) DP Pressure difference (MLT) Q Total Flow rate (LT) W Local width of the Fracture (L)
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x ray ct based numerical analysis of Fracture Flow for core samples under various confining pressures
Engineering Geology, 2011Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Nobuo Hirano, Hiroshi Okabe, Noriyoshi TsuchiyaAbstract:Abstract The X-ray CT based numerical analysis of Fracture Flow for core samples, recently developed by the authors, was applied to two granite core samples having either a mated artificial or a mated natural Fracture at confining pressures of 5 to 50 MPa. A third-generation medical X-ray CT scanner was used to image the samples within a core holder consisting of an aluminum liner and a carbon fiber overwrap. Fracture models (i.e., aperture distributions) were obtained by the CT images, the resolution of which was coarser than the apertures, and a single-phase Flow simulation was performed using a local cubic law-based Fracture Flow model. Numerical results were evaluated by a Fracture porosity measurement and a solution displacement experiment using NaCl and NaI aqueous solutions. These numerical results coincided only qualitatively with the experimental results, primarily due to image noise from the aluminum liner of the core holder. Nevertheless, the numerical results revealed Flow paths within the Fractures and their changes with confining pressure, whereas the experimental results did not provide such results. Different stress-dependencies in the Flow paths were observed between the two samples despite the similar stress-dependency in Fracture porosity and permeability. The changes in total area of the Flow paths with confining pressure coincided qualitatively with changes in breakthrough points in the solution displacement experiment. Although the data is limited, the results of the present study suggest the importance of analyzing fluid Flows within naturally Fractured core samples under in situ conditions in order to better understand the Fracture Flow characteristics in a specific field. As demonstrated herein, X-ray CT-based numerical analysis is effective for addressing this concern. Using a multi-phase Flow model, as well as a core holder constructed of an engineered plastic, should provide a useful, non-destructive, and non-contaminative X-ray CT-based Fracture Flow analysis for core samples under in situ conditions in future studies.
Noriyoshi Tsuchiya - One of the best experts on this subject based on the ideXlab platform.
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geologic core holder with a cfr peek body for the x ray ct based numerical analysis of Fracture Flow under confining pressure
Rock Mechanics and Rock Engineering, 2013Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Noriyoshi Tsuchiya, Hiroshi OkabeAbstract:Variables A Cross-sectional area of the model (L) a Local aperture of the Fracture (L) ai Aperture at the ith voxel (L) CTVi CT value at the ith voxel (Hounsfield unit) f Correction factor for the cubic law equation k Permeability of the model (L) L Length of the model (L) N Total number of voxels P Pressure of the fluid (MLT) DP Pressure difference (MLT) Q Total Flow rate (LT) W Local width of the Fracture (L)
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x ray ct based numerical analysis of Fracture Flow for core samples under various confining pressures
Engineering Geology, 2011Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Nobuo Hirano, Hiroshi Okabe, Noriyoshi TsuchiyaAbstract:Abstract The X-ray CT based numerical analysis of Fracture Flow for core samples, recently developed by the authors, was applied to two granite core samples having either a mated artificial or a mated natural Fracture at confining pressures of 5 to 50 MPa. A third-generation medical X-ray CT scanner was used to image the samples within a core holder consisting of an aluminum liner and a carbon fiber overwrap. Fracture models (i.e., aperture distributions) were obtained by the CT images, the resolution of which was coarser than the apertures, and a single-phase Flow simulation was performed using a local cubic law-based Fracture Flow model. Numerical results were evaluated by a Fracture porosity measurement and a solution displacement experiment using NaCl and NaI aqueous solutions. These numerical results coincided only qualitatively with the experimental results, primarily due to image noise from the aluminum liner of the core holder. Nevertheless, the numerical results revealed Flow paths within the Fractures and their changes with confining pressure, whereas the experimental results did not provide such results. Different stress-dependencies in the Flow paths were observed between the two samples despite the similar stress-dependency in Fracture porosity and permeability. The changes in total area of the Flow paths with confining pressure coincided qualitatively with changes in breakthrough points in the solution displacement experiment. Although the data is limited, the results of the present study suggest the importance of analyzing fluid Flows within naturally Fractured core samples under in situ conditions in order to better understand the Fracture Flow characteristics in a specific field. As demonstrated herein, X-ray CT-based numerical analysis is effective for addressing this concern. Using a multi-phase Flow model, as well as a core holder constructed of an engineered plastic, should provide a useful, non-destructive, and non-contaminative X-ray CT-based Fracture Flow analysis for core samples under in situ conditions in future studies.
Yutaka Ohsaki - One of the best experts on this subject based on the ideXlab platform.
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geologic core holder with a cfr peek body for the x ray ct based numerical analysis of Fracture Flow under confining pressure
Rock Mechanics and Rock Engineering, 2013Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Noriyoshi Tsuchiya, Hiroshi OkabeAbstract:Variables A Cross-sectional area of the model (L) a Local aperture of the Fracture (L) ai Aperture at the ith voxel (L) CTVi CT value at the ith voxel (Hounsfield unit) f Correction factor for the cubic law equation k Permeability of the model (L) L Length of the model (L) N Total number of voxels P Pressure of the fluid (MLT) DP Pressure difference (MLT) Q Total Flow rate (LT) W Local width of the Fracture (L)
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x ray ct based numerical analysis of Fracture Flow for core samples under various confining pressures
Engineering Geology, 2011Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Nobuo Hirano, Hiroshi Okabe, Noriyoshi TsuchiyaAbstract:Abstract The X-ray CT based numerical analysis of Fracture Flow for core samples, recently developed by the authors, was applied to two granite core samples having either a mated artificial or a mated natural Fracture at confining pressures of 5 to 50 MPa. A third-generation medical X-ray CT scanner was used to image the samples within a core holder consisting of an aluminum liner and a carbon fiber overwrap. Fracture models (i.e., aperture distributions) were obtained by the CT images, the resolution of which was coarser than the apertures, and a single-phase Flow simulation was performed using a local cubic law-based Fracture Flow model. Numerical results were evaluated by a Fracture porosity measurement and a solution displacement experiment using NaCl and NaI aqueous solutions. These numerical results coincided only qualitatively with the experimental results, primarily due to image noise from the aluminum liner of the core holder. Nevertheless, the numerical results revealed Flow paths within the Fractures and their changes with confining pressure, whereas the experimental results did not provide such results. Different stress-dependencies in the Flow paths were observed between the two samples despite the similar stress-dependency in Fracture porosity and permeability. The changes in total area of the Flow paths with confining pressure coincided qualitatively with changes in breakthrough points in the solution displacement experiment. Although the data is limited, the results of the present study suggest the importance of analyzing fluid Flows within naturally Fractured core samples under in situ conditions in order to better understand the Fracture Flow characteristics in a specific field. As demonstrated herein, X-ray CT-based numerical analysis is effective for addressing this concern. Using a multi-phase Flow model, as well as a core holder constructed of an engineered plastic, should provide a useful, non-destructive, and non-contaminative X-ray CT-based Fracture Flow analysis for core samples under in situ conditions in future studies.
Yoshihiro Tsuchiya - One of the best experts on this subject based on the ideXlab platform.
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geologic core holder with a cfr peek body for the x ray ct based numerical analysis of Fracture Flow under confining pressure
Rock Mechanics and Rock Engineering, 2013Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Noriyoshi Tsuchiya, Hiroshi OkabeAbstract:Variables A Cross-sectional area of the model (L) a Local aperture of the Fracture (L) ai Aperture at the ith voxel (L) CTVi CT value at the ith voxel (Hounsfield unit) f Correction factor for the cubic law equation k Permeability of the model (L) L Length of the model (L) N Total number of voxels P Pressure of the fluid (MLT) DP Pressure difference (MLT) Q Total Flow rate (LT) W Local width of the Fracture (L)
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x ray ct based numerical analysis of Fracture Flow for core samples under various confining pressures
Engineering Geology, 2011Co-Authors: Noriaki Watanabe, Takuya Ishibashi, Yutaka Ohsaki, Yoshihiro Tsuchiya, Tetsuya Tamagawa, Nobuo Hirano, Hiroshi Okabe, Noriyoshi TsuchiyaAbstract:Abstract The X-ray CT based numerical analysis of Fracture Flow for core samples, recently developed by the authors, was applied to two granite core samples having either a mated artificial or a mated natural Fracture at confining pressures of 5 to 50 MPa. A third-generation medical X-ray CT scanner was used to image the samples within a core holder consisting of an aluminum liner and a carbon fiber overwrap. Fracture models (i.e., aperture distributions) were obtained by the CT images, the resolution of which was coarser than the apertures, and a single-phase Flow simulation was performed using a local cubic law-based Fracture Flow model. Numerical results were evaluated by a Fracture porosity measurement and a solution displacement experiment using NaCl and NaI aqueous solutions. These numerical results coincided only qualitatively with the experimental results, primarily due to image noise from the aluminum liner of the core holder. Nevertheless, the numerical results revealed Flow paths within the Fractures and their changes with confining pressure, whereas the experimental results did not provide such results. Different stress-dependencies in the Flow paths were observed between the two samples despite the similar stress-dependency in Fracture porosity and permeability. The changes in total area of the Flow paths with confining pressure coincided qualitatively with changes in breakthrough points in the solution displacement experiment. Although the data is limited, the results of the present study suggest the importance of analyzing fluid Flows within naturally Fractured core samples under in situ conditions in order to better understand the Fracture Flow characteristics in a specific field. As demonstrated herein, X-ray CT-based numerical analysis is effective for addressing this concern. Using a multi-phase Flow model, as well as a core holder constructed of an engineered plastic, should provide a useful, non-destructive, and non-contaminative X-ray CT-based Fracture Flow analysis for core samples under in situ conditions in future studies.
