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Pages: 92
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Convection with Phase Change During Gas Formation from Methane Hydrates via Depressurization of Porous Layers
L. A. O. Rocha
Department of Mechanical Engineering and Materials Science, Duke University, Durham North Carolina 27708-0300
M. Neagu
Department of Mechanical Engineering and Materials Science, Duke University, Durham North Carolina 27708-0300
Adrian Bejan
Department of Mechanical Engineering, Duke University, Durham, NC 27706 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.
pages 14
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