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Correlation of the Growth Rate of the Hydrate Layer at a Guest/Liquid-Water Interface to Mass Transfer Resistance

Author

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  • Masatoshi Kishimoto

    (Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan)

  • Ryo Ohmura

    (Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan)

Abstract

Growth rate of a hydrate layer at the guest/liquid-water interface is analyzed considering the conjugate process of the mass-transfer and hydrate crystal growth. Hydrate-layer growth rate data in the literature are often compiled according to the system subcooling (∆ T ≡ T eq − T ex , where T eq is the equilibrium dissociation temperature of the hydrate and T ex is the system temperature), suggesting predominant heat transfer limitations. In this paper, we investigate how the existing data on hydrate-layer growth is better correlated to mass transfer of the guest species in liquid water in three-phase equilibrium with bulk guest fluid and hydrate. We have analyzed the conjugate processes of mass-transfer/hydrate-layer-growth following our previous study on the hydrate crystal growth into liquid water saturated with a guest substance. A dimensionless parameter representing the hydrate-layer growth rate is derived from the analysis. This analysis is based on the idea that the growth rate is controlled by the mass transfer of the hydrate-guest substance, dissolved in the bulk of liquid water, to the front of the growing hydrate-layer along the guest/water interface. The variations in the hydrate-layer growth rate observed in the previous studies are related to the dimensionless parameter.

Suggested Citation

  • Masatoshi Kishimoto & Ryo Ohmura, 2012. "Correlation of the Growth Rate of the Hydrate Layer at a Guest/Liquid-Water Interface to Mass Transfer Resistance," Energies, MDPI, vol. 5(1), pages 1-9, January.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:1:p:92-100:d:15740
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    Cited by:

    1. Koyama, Ryo & Chen, Li-Jen & Alavi, Saman & Ohmura, Ryo, 2020. "Improving thermal efficiency of hydrate-based heat engine generating renewable energy from low-grade heat sources using a crystal engineering approach," Energy, Elsevier, vol. 198(C).
    2. Ohfuka, Yugo & Ohmura, Ryo, 2016. "Theoretical performance analysis of hydrate-based heat engine system suitable for low-temperature driven power generation," Energy, Elsevier, vol. 101(C), pages 27-33.

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