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Research Papers: Heat and Mass Transfer

Heat-Induced Evolution of Phase Transformations in Tetrahydrofuran Hydrate-Bearing Sediment

[+] Author and Article Information
X. H. Zhang

Associate Professor
Institute of Mechanics, CAS,
No. 15 Beisihuanxi Road,
Beijing 100190, China
e-mail: zhangxuhui@imech.ac.cn

X. B. Lu

Institute of Mechanics, CAS,
No. 15 Beisihuanxi Road,
Beijing 100190, China
e-mail: xblu@imech.ac.cn

Z. M. Zheng

Institute of Mechanics, CAS,
No. 15 Beisihuanxi Road,
Beijing 100190, China
e-mail: zhengzm@lnm.imech.ac.cn

L. M. Zhang

Hong Kong University of Science and Technology,
Clear Water Bay, Hong Kong
e-mail: cezhangl@ust.hk

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 11, 2012; final manuscript received January 3, 2014; published online March 6, 2014. Assoc. Editor: Wei Tong.

J. Heat Transfer 136(5), 052002 (Mar 06, 2014) (8 pages) Paper No: HT-12-1280; doi: 10.1115/1.4026454 History: Received June 11, 2012; Revised January 03, 2014

Heat conduction and phase transformations are basic physical-chemical process and control the kinetics of dissociation, fluid flow and strata deformation during hydrate dissociation in sediments. This paper presents a simplified analysis of the thermal process by assuming that the heat-induced evolution can be decoupled from flow and deformation processes. Self-similar solutions for one-, two- and three-phase transformation fronts are obtained. A series of experiments on THF-hydrate-bearing sediments was conducted to test the theory. The theoretical, numerical and experimental results on the evolution of hydrate dissociation front in the sediment are in good agreement.

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Figures

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Fig. 1

Evolution of phase transformation fronts. Note: Z1, non-dissociated zone: hydrate and sediment skeleton; Z2, hydrate dissociation zone: liquid, water and sediment skeleton; Z3, gasification zone: gas, water and sediment skeleton; Z4, water vaporization zone: sediment skeleton, water vapor, gas; F1, hydrate dissociation front; F2, gasification front; F3, water vaporization front; TH and Tew, Tef, Teh represent the heat source temperature and the phase transformation temperatures of water to water vapor, liquid to gas, hydrate dissociation.

Grahic Jump Location
Fig. 2

Division of dissociation and non-dissociated zones

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Fig. 3

ξ lines at the hydrate dissociation front F1 and different zones, each line tracks the location of a given temperature with time

Grahic Jump Location
Fig. 4

Layout of one-dimensional cylinder. (a) Schematic diagram. (b) Photo of the one-dimensional cylinder.

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