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Energies 2015, 8(6), 5361-5369; doi:10.3390/en8065361

Is the Surface of Gas Hydrates Dry?

CSIRO Manufacturing Flagship, Ian Wark Laboratory, Bayview Avenue, Clayton, VIC 3168, Australia
Academic Editor: Richard Coffin
Received: 27 January 2015 / Revised: 25 May 2015 / Accepted: 28 May 2015 / Published: 4 June 2015
(This article belongs to the Special Issue Coastal Ocean Natural Gas Hydrate 2014)
View Full-Text   |   Download PDF [351 KB, uploaded 4 June 2015]   |  

Abstract

Adhesion (cohesion) and agglomeration properties of gas hydrate particles have been a key to hydrate management in flow assurance in natural gas pipelines. Despite its importance, the relevant data in the area, such as the surface energy and the interfacial energy of gas hydrates with gas and/or water, are scarce; presumably due to the experimental difficulties involved in the measurements. Here we review what is known about the surface energy and the interfacial energy of gas hydrates to date. In particular, we ask a question as to whether pre-melting can occur on the surface of gas hydrates. Surface thermodynamic analyses show that pre-melting is favoured to occur on the surface of gas hydrates, however, not sufficient data are available to assess its thickness. The effects of the existence of pre-melting layers on the cohesion and friction forces between gas hydrate particles are also discussed. View Full-Text
Keywords: gas hydrate; pre-melting; ice; adhesion gas hydrate; pre-melting; ice; adhesion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Maeda, N. Is the Surface of Gas Hydrates Dry? Energies 2015, 8, 5361-5369.

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