Pore-scale modeling of transient and steady-state vapor diffusion in partially-saturated porous media

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Vapor diffusion in porous media in the presence of its own liquid may be enhanced due to pore-scale processes, such as condensation and evaporation across isolated liquid islands. Webb and Ho (1997) developed a mechanistic pore-scale model of these processes under steady-state conditions in which condensation and evaporation on the liquid island were equal. The vapor diffusion rate was significantly enhanced by these liquid island processes by up to an order of magnitude compared to a dry porous media. However, vapor transport by diffusion is often complicated by transient effects, such as in drying applications, in which net evaporation of ... continued below

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13 p.

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Webb, S.W. May 1, 1998.

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Description

Vapor diffusion in porous media in the presence of its own liquid may be enhanced due to pore-scale processes, such as condensation and evaporation across isolated liquid islands. Webb and Ho (1997) developed a mechanistic pore-scale model of these processes under steady-state conditions in which condensation and evaporation on the liquid island were equal. The vapor diffusion rate was significantly enhanced by these liquid island processes by up to an order of magnitude compared to a dry porous media. However, vapor transport by diffusion is often complicated by transient effects, such as in drying applications, in which net evaporation of liquid may further augment the vapor flux from diffusion. The influence of transient effects on the enhancement factors for vapor diffusion is evaluated in this paper. In addition, the effect of vapor pressure lowering on the enhancement factor and on porescale vapor fluxes is shown.

Physical Description

13 p.

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OSTI as DE98005451

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  • ASME/AIAA joint thermophysics and heat transfer conference, Albuquerque, NM (United States), 15-18 Jun 1998

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  • Other: DE98005451
  • Report No.: SAND--98-1061C
  • Report No.: CONF-980610--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/658277 | External Link
  • Office of Scientific & Technical Information Report Number: 658277
  • Archival Resource Key: ark:/67531/metadc702551

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  • May 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 7:35 p.m.

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Webb, S.W. Pore-scale modeling of transient and steady-state vapor diffusion in partially-saturated porous media, report, May 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc702551/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.