Diffusion with condensation and evaporation in porous media

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Description

Vapor phase transport in porous media is important in a number of environmental and industrial processes: soil moisture transport, vapor phase transport in the vadose zone, transport in the vicinity of buried nuclear waste, and industrial processes such as drying. The diffusion of water vapor in a packed bed containing residual liquid is examined experimentally. The objective is to quantify the effect of enhanced vapor diffusion resulting from evaporation/condensation in porous media subjected to a temperature gradient. Isothermal diffusion experiments in free-space were conducted to qualify the experimental apparatus and techniques. For these experiments measured diffusion coefficients are within 3.6% ... continued below

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10 p.

Creation Information

Gu, L.; Plumb, O.A.; Ho, C.K. & Webb, S.W. March 1, 1998.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 19 times . More information about this report can be viewed below.

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Authors

  • Gu, L.
  • Plumb, O.A. Washington State Univ., Pullman, WA (United States). School of Mechanical and Materials Engineering
  • Ho, C.K.
  • Webb, S.W. Sandia National Labs., Albuquerque, NM (United States). Geohydrology Dept.

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Publisher

  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Vapor phase transport in porous media is important in a number of environmental and industrial processes: soil moisture transport, vapor phase transport in the vadose zone, transport in the vicinity of buried nuclear waste, and industrial processes such as drying. The diffusion of water vapor in a packed bed containing residual liquid is examined experimentally. The objective is to quantify the effect of enhanced vapor diffusion resulting from evaporation/condensation in porous media subjected to a temperature gradient. Isothermal diffusion experiments in free-space were conducted to qualify the experimental apparatus and techniques. For these experiments measured diffusion coefficients are within 3.6% of those reported in the literature for the temperature range from 25 C to 40 C. Isothermal experiments in packed beds of glass beads were used to determine the tortuosity coefficient resulting in {tau} = 0.78 {+-} 0.028, which is also consistent with previously reported results. Nonisothermal experiments in packed beds in which condensation occurs were conducted to examine enhanced vapor diffusion. The interpretation of the results for these experiments is complicated by a gradual, but continuous, build-up of condensate in the packed beds during the course of the experiment. Results indicate diffusion coefficients which increase as a function of saturation resulting in enhancement of the vapor-phase transport by a factor of approximately four compared to a dry porous medium.

Physical Description

10 p.

Notes

INIS; OSTI as DE98004240

Source

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

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Identifier

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  • Other: DE98004240
  • Report No.: SAND--98-0618C
  • Report No.: CONF-980610--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/650169 | External Link
  • Office of Scientific & Technical Information Report Number: 650169
  • Archival Resource Key: ark:/67531/metadc703340

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Creation Date

  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • May 5, 2016, 8:28 p.m.

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Gu, L.; Plumb, O.A.; Ho, C.K. & Webb, S.W. Diffusion with condensation and evaporation in porous media, report, March 1, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc703340/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.