Effects of capillary heterogeneity on vapor-liquid counterflow in porous media

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Based on a continuum description, the effect of capillary heterogeneity, induced by variation in permeability, on the steady state, countercurrent, vapor-liquid flow in porous media is analyzed. It is shown that the heterogeneity acts as a body force, that may enhance or diminish gravity effects on heat pipes. Selection rules that determine the steady states reached in homogeneous, gravity-driven heat pipes are also formulated. It is shown that the ``infinite`` two-phase zone may terminate by a substantial change in the permeability somewhere in the medium. The two possible sequences, liquid - liquid dominated - dry, or liquid - vapor dominated … continued below

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24 p.

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Stubos, A. K.; Satik, C. & Yortsos, Y. C. June 1, 1992.

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Description

Based on a continuum description, the effect of capillary heterogeneity, induced by variation in permeability, on the steady state, countercurrent, vapor-liquid flow in porous media is analyzed. It is shown that the heterogeneity acts as a body force, that may enhance or diminish gravity effects on heat pipes. Selection rules that determine the steady states reached in homogeneous, gravity-driven heat pipes are also formulated. It is shown that the ``infinite`` two-phase zone may terminate by a substantial change in the permeability somewhere in the medium. The two possible sequences, liquid - liquid dominated - dry, or liquid - vapor dominated - dry find applications in geothermal systems. Finally, it is shown that although weak heterogeneity affects only gravity controlled flows, stronger variations in permeability can give rise to significant capillary effects.

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24 p.

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OSTI; NTIS; GPO Dep.

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  • Other Information: PBD: Jun 1992

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  • June 1, 1992

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  • April 10, 2019, 12:41 p.m.

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Stubos, A. K.; Satik, C. & Yortsos, Y. C. Effects of capillary heterogeneity on vapor-liquid counterflow in porous media, report, June 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1384518/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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