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Fumio Kiyono - One of the best experts on this subject based on the ideXlab platform.

  • estimation of Dissociation Rate Constant of co2 hydRate in water flow
    Greenhouse Gases-Science and Technology, 2015
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO2 dissolved in water at the hydRate surface to the solubility of CO2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • Estimation of Dissociation Rate Constant of CO 2 hydRate in water flow
    Greenhouse Gases: Science and Technology, 2014
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO 2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO 2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO 2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO 2 dissolved in water at the hydRate surface to the solubility of CO 2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO 2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO 2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • cfd and experimental study on methane hydRate Dissociation part i Dissociation under water flow
    Aiche Journal, 2007
    Co-Authors: Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of methane hydRate under water flow conditions were investigated by a combination of experimental observations and numerical simulations using computational fluid dynamics (CFD). In Part I of this study, the Dissociation process induced by water flow at pressures above the three-phase [hydRate (H)–liquid water (Lw)–vapor (V)] boundary in an isothermal x–P phase diagram is discussed. Dissociation experiments were carried out with a methane hydRate ball (diameter ≅ 10 mm) suspended in a flow cell, and the overall Dissociation Rate of methane hydRate without bubble formation was measured under various conditions of pressure, temperature, and volumetric flow Rate of water. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant kbl and the molar Gibbs free energy difference ΔG, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of methane dissolved in water at the hydRate surface to the solubility of methane in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant kbl was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of methane by the CFD method. The obtained Dissociation Rate Constant was found to be independent of the ambient water flow Rate, indicating that the Rate Constant is intrinsic for the hydRate Dissociation within the conditions examined in this study. The Rate Constant was independent of the pressure, whereas the temperature dependency was described by an Arrhenius-type equation with the apparent activation energy of 98.3 kJ/mol. © 2006 American Institute of Chemical Engineers AIChE J, 2007

Wuyang Sean - One of the best experts on this subject based on the ideXlab platform.

  • estimation of Dissociation Rate Constant of co2 hydRate in water flow
    Greenhouse Gases-Science and Technology, 2015
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO2 dissolved in water at the hydRate surface to the solubility of CO2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • Estimation of Dissociation Rate Constant of CO 2 hydRate in water flow
    Greenhouse Gases: Science and Technology, 2014
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO 2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO 2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO 2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO 2 dissolved in water at the hydRate surface to the solubility of CO 2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO 2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO 2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • cfd and experimental study on methane hydRate Dissociation part i Dissociation under water flow
    Aiche Journal, 2007
    Co-Authors: Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of methane hydRate under water flow conditions were investigated by a combination of experimental observations and numerical simulations using computational fluid dynamics (CFD). In Part I of this study, the Dissociation process induced by water flow at pressures above the three-phase [hydRate (H)–liquid water (Lw)–vapor (V)] boundary in an isothermal x–P phase diagram is discussed. Dissociation experiments were carried out with a methane hydRate ball (diameter ≅ 10 mm) suspended in a flow cell, and the overall Dissociation Rate of methane hydRate without bubble formation was measured under various conditions of pressure, temperature, and volumetric flow Rate of water. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant kbl and the molar Gibbs free energy difference ΔG, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of methane dissolved in water at the hydRate surface to the solubility of methane in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant kbl was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of methane by the CFD method. The obtained Dissociation Rate Constant was found to be independent of the ambient water flow Rate, indicating that the Rate Constant is intrinsic for the hydRate Dissociation within the conditions examined in this study. The Rate Constant was independent of the pressure, whereas the temperature dependency was described by an Arrhenius-type equation with the apparent activation energy of 98.3 kJ/mol. © 2006 American Institute of Chemical Engineers AIChE J, 2007

Akihiro Yamasaki - One of the best experts on this subject based on the ideXlab platform.

  • estimation of Dissociation Rate Constant of co2 hydRate in water flow
    Greenhouse Gases-Science and Technology, 2015
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO2 dissolved in water at the hydRate surface to the solubility of CO2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • Estimation of Dissociation Rate Constant of CO 2 hydRate in water flow
    Greenhouse Gases: Science and Technology, 2014
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO 2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO 2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO 2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO 2 dissolved in water at the hydRate surface to the solubility of CO 2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO 2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO 2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • cfd and experimental study on methane hydRate Dissociation part i Dissociation under water flow
    Aiche Journal, 2007
    Co-Authors: Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of methane hydRate under water flow conditions were investigated by a combination of experimental observations and numerical simulations using computational fluid dynamics (CFD). In Part I of this study, the Dissociation process induced by water flow at pressures above the three-phase [hydRate (H)–liquid water (Lw)–vapor (V)] boundary in an isothermal x–P phase diagram is discussed. Dissociation experiments were carried out with a methane hydRate ball (diameter ≅ 10 mm) suspended in a flow cell, and the overall Dissociation Rate of methane hydRate without bubble formation was measured under various conditions of pressure, temperature, and volumetric flow Rate of water. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant kbl and the molar Gibbs free energy difference ΔG, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of methane dissolved in water at the hydRate surface to the solubility of methane in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant kbl was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of methane by the CFD method. The obtained Dissociation Rate Constant was found to be independent of the ambient water flow Rate, indicating that the Rate Constant is intrinsic for the hydRate Dissociation within the conditions examined in this study. The Rate Constant was independent of the pressure, whereas the temperature dependency was described by an Arrhenius-type equation with the apparent activation energy of 98.3 kJ/mol. © 2006 American Institute of Chemical Engineers AIChE J, 2007

Toru Sato - One of the best experts on this subject based on the ideXlab platform.

  • estimation of Dissociation Rate Constant of co2 hydRate in water flow
    Greenhouse Gases-Science and Technology, 2015
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO2 dissolved in water at the hydRate surface to the solubility of CO2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • Estimation of Dissociation Rate Constant of CO 2 hydRate in water flow
    Greenhouse Gases: Science and Technology, 2014
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO 2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO 2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO 2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO 2 dissolved in water at the hydRate surface to the solubility of CO 2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO 2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO 2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • cfd and experimental study on methane hydRate Dissociation part i Dissociation under water flow
    Aiche Journal, 2007
    Co-Authors: Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of methane hydRate under water flow conditions were investigated by a combination of experimental observations and numerical simulations using computational fluid dynamics (CFD). In Part I of this study, the Dissociation process induced by water flow at pressures above the three-phase [hydRate (H)–liquid water (Lw)–vapor (V)] boundary in an isothermal x–P phase diagram is discussed. Dissociation experiments were carried out with a methane hydRate ball (diameter ≅ 10 mm) suspended in a flow cell, and the overall Dissociation Rate of methane hydRate without bubble formation was measured under various conditions of pressure, temperature, and volumetric flow Rate of water. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant kbl and the molar Gibbs free energy difference ΔG, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of methane dissolved in water at the hydRate surface to the solubility of methane in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant kbl was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of methane by the CFD method. The obtained Dissociation Rate Constant was found to be independent of the ambient water flow Rate, indicating that the Rate Constant is intrinsic for the hydRate Dissociation within the conditions examined in this study. The Rate Constant was independent of the pressure, whereas the temperature dependency was described by an Arrhenius-type equation with the apparent activation energy of 98.3 kJ/mol. © 2006 American Institute of Chemical Engineers AIChE J, 2007

Ayako Fukumoto - One of the best experts on this subject based on the ideXlab platform.

  • estimation of Dissociation Rate Constant of co2 hydRate in water flow
    Greenhouse Gases-Science and Technology, 2015
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO2 dissolved in water at the hydRate surface to the solubility of CO2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

  • Estimation of Dissociation Rate Constant of CO 2 hydRate in water flow
    Greenhouse Gases: Science and Technology, 2014
    Co-Authors: Ayako Fukumoto, Wuyang Sean, Toru Sato, Akihiro Yamasaki, Fumio Kiyono
    Abstract:

    Dissociation processes of CO 2 hydRate under water flow conditions were investigated by experimental measurements and numerical calculation. Dissociation experiments were carried out with a CO 2 hydRate ball (diameter 10 mm) mounted in a flow cell, and the overall Dissociation Rate of CO 2 hydRate without bubble formation was measured under various conditions of temperature, pressure, and water flow Rate. A linear phenomenological Rate equation in the form of the product of the Dissociation Rate Constant and the molar Gibbs free energy difference, between the hydRate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the Dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of CO 2 dissolved in water at the hydRate surface to the solubility of CO 2 in the aqueous solution in equilibrium with the hydRate. The Dissociation Rate Constant was determined from the experimental results of the overall Dissociation Rate combined with the numerical simulation results of the concentration profile of CO 2 constructed by the computational fluid dynamics (CFD) method. The obtained Dissociation Rate Constant at the same pressure was found to be dependent on the temperature with the apparent activation energy of 97.51 kJ/mol. A general form with product of the Dissociation Rate Constant times driving force is proposed to calculate the Dissociation Rate of CO 2 hydRate in the water. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd