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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v4.i4.20
14 pages

Convection with Phase Change During Gas Formation from Methane Hydrates via Depressurization of Porous Layers

Luiz Alberto O. Rocha
Programa de Pos-Graduacao em Engenharia Mecanica, Universidade Federal do Rio Grande do Sul Porto Alegre, Brazil, Rua Sarmento Leite, 425, 90.050-170
M. Neagu
Department of Mechanical Engineering and Materials Science, Duke University, Durham North Carolina 27708-0300
Adrian Bejan
Department of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708-0300, USA
R. S. Cherry
Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2203

ABSTRACT

This is an analytical and numerical study of the generation and flow of methane gas through a layer of porous medium impregnated with solid clathrate hydrates. The porous layer is depressurized suddenly on its lower plane. The phase-change front advances upward under the influence of heat conduction and convection. The first part of the article describes a simplified analytical solution based on a unidirectional phase-change model in which the conduction in the gas-filled region behind the front is neglected. The second part presents numerical results for the evolution of the unidirectional phase-change process. Both methods lead to the conclusion that the rate of gas flow through the depressurized (bottom) plane of the layer decreases approximately as t−1/2.