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Formation and dissociation of clathrate hydrates and related heat/mass transfer

Research Project

Project/Area Number 10450088
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKeio University

Principal Investigator

MORI Yasuhiko h.  Keio University, Department of Mechanical Engineering, Professor, 理工学部, 教授 (90051888)

Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1998: ¥4,500,000 (Direct Cost: ¥4,500,000)
Keywordsclathrate hydrate / gas hydrate / crystal growth / mass transfer / heat transfer / global warming / energy storage / エネルギー貯蔵 / 蓄熱
Research Abstract

This project has investigated the formation, growth and dissociation of clathrate hydrates on the basis of heat-and mass-transfer science. Major results obtained in the project are summarized below.
(1) The thickness of hydrate films formed at the interface between water and a hydrophobic guest substance both in liquid states was measured, using a laser interferometer. These measurements revealed a strong temperature dependency of the variation in thickness of the films with their age.
(2) Microscopic, cross-sectional observations of hydrate films each formed in a narrow water channel confined by parallel, transparent plates revealed a substantial effect of water shear flow on the surface/internal texture and the thickness of the films.
(3) An analytical model was constructed, which relates the simultaneous heat and mass transfer to/from and across a hydrate film to its thickness.
(4) The observed profiles of sessile drops of a hydrophobic guest substance in water before and after the formation of hydrate films were analyzed to deduce the water-guest interfacial tension. The tension was found to be hardly affected by the prior hydrate formation/dissociation at the drop surfaces.
(5) The behavior of formation and growth, or melting, of a planar hydrate layer from, or into, an aqueous tetrahydrofuran solution having the same composition as that of the hydrate were observed in a one-dimensional heat-transfer system. The behavior was found to be well simulated by a simple heat-transfer analysis, assuming local equilibrium at the hydrate-solution interfaces.
(6) A novel scheme for rapid hydrate formation was proposed, which utilizes water spraying against a cooled metal block in the ambience of a guest gas. The hydrate formation in an experimental system equipped with such a spray/cooler assembly was observed.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Mori,Yasuhiko H.: "Modeling of simultaneous heat and mass transfer to/form and across a hydrate film"Annals of the New York Academy of Sciences. Vol.912. 633-641 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ohmura,Ryo: "Mechanical properties of water/hydrate-former phase boundaries and phase-separating hydrate films"Annals of the New York Academy of Sciences. Vol.912. 958-966 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ohmura,Ryo: "Measurements of clathrate-hydrate film thickness using laser interferometry"Journal of Crystal Growth. Vol.218,Nos.2-4. 372-380 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kobayashi,Izushi: "Microscopic observations of clathrate-hydrate films formed at liquid/liquid interfaces. I. Morphology of hydrate films"Chemical Engineering Science. (未定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Fukumoto,Kazuya: "Hydrate formation using water spraying in a hydrophobic gas : a preliminary study"AIChE Journal. (未定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Iida,Tomoyuki: "Formation and dissociation of clathrate hydrate in stoichiometric tetrahydrofuranwater mixture subjected to one-dimensional cooling or heating"Chemical Engineering Science. (未定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Mori, Yasuhiko H.: "Modeling of simultaneous heat and mass transfer to/from and across a hydrate film"Annals of the New York Academy of Sciences. 912. 633-641 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ohmura, Ryo: "Mechanical properties of water/hydrate-former phase boundaries and phaseseparating hydrate films"Annals of the New York Academy of Sciences. 912. 958-966 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ohmura, Ryo: "Measurements of clathrate-hydrate film thickness using laser interferometry"Journal of Crystal Growth. 218-2/4. 372-380 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kobayashi, Izushi: "Microscopic observations of clathrate-hydrate films formed at liquid/liquid interfaces. I.Morphology of hydrate films"Chemical Engineering Science. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Fukumoto, Kazuya: "Hydrate formation using water spraying in a hydrophobic gas : a preliminary study"AIChE Jouranl. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Iida, Tomoyuki: "Formation and dissociation of clathrate hydrate in stoichiometric tetrahydrofuran-water mixture subjected to one-dimensional cooling or heating"Chemical Engineering Science. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Mori,Yasuhiko H.: "Modeling of simultaneous heat and mass transfer to/from and across a hydrate film"Annals of the New York Academy of Sciences. Vol.912. 633-641 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ohmura,Ryo: "Mechanical properties of water/hydrate-former phase boundaries and phase-separating hydrate films"Annals of the New York Academy of Sciences. Vol.912. 958-966 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ohmura,Ryo: "Measurements of clathrate-hydrate film thickness using laser interferometry"Journal of Crystal Growth. Vol.218,Nos.2-4. 372-380 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kobayashi,Izushi: "Microscopic observations of clathrate-hydrate films formed at liquid/liquid interfaces. I. Morphology of hydrate films"Chemical Engineering Science. (未定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Fukumoto,Kazuya: "Hydrate formation using water spraying in a hydrophobic gas : a preliminary study"AIChE Journal. (未定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Iida,Tomoyuki: "Formation and dissociation of clathrate hydrate in stoichiometric tetrahydrofuranwater mixture subjected to one-dimensional cooling or heating"Chemical Engineering Science. (未定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Mori,Yasuhiko H.: "Modeling of simultaneous heat and mass transfer to/from and across a hydrate film"Annals of the New York Academy of Sciences. (未定).

    • Related Report
      1999 Annual Research Report
  • [Publications] Ohmura,Ryo: "Mechanical properties of water/hydrate-former phase boundaries and phase-separating hydrate films"Annals of the New York Academy of Sciences. (未定).

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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