Abstract
Moisture removal from a two-layer porous media in which air is circulated through one layer and moisture is removed from the second has not been well studied due to the emphasis given to single-layer systems. This two-layer configuration is common in natural and engineered systems and can be used as a means to create a barrier to downward migrating fluids and to remove liquids and gases that may be present in the finer layer. However, there is little data on moisture removal from a two-layer porous media in which air is circulated through one layer parallel to the interface and moisture is removed from the finer second layer by evaporation. A conceptual model of the moisture removal from a two-layer porous media system was developed and compared to experimental moisture removal rates from laboratory scale dry barriers. The limited experimental data agrees well with the results predicted by the conceptual model, providing an initial validation.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bird, R. B., Stewart, W. E. and Lightfoot, E. N.: 1960, Transport Phenomena, Wiley.
Beek, W. J. and Muttzall, K. M. K.: 1975, Transport Phenomena, Wiley.
Cussler, E. L.: 1997, Diffusion, Mass Transfer in Fluid Systems, Cambridge University Press.
Ford, R. W.: 1964, Drying, Maclaren.
Incropera, F. P. and Dewitt, D. P.: 1981, Fundamentals of Heat Transfer, Wiley.
Jury, W. A., Gardner, W. R. and Gardner, W. H.: 1991, Soil Physics, Wiley.
Masmoudi, W. and Prat, M.: 1991, Heat and mass transfer between a porous medium and a parallel external flow: Applications to drying of capillary porous materials, Int. J. Heat Mass Transfer, 34(8), 1975-1989.
Millington, R. J. and Quirk, J. M.: 1961, Permeability of porous solids, Transactions of the Faraday Society, Vol. 57, pp. 1200-1207.
Morris, C. E.: 1994, Dry barriers: a study of the soil physics associated with moisture removal and an assessment of the feasibility of installing a subsurface system, PhD Dissertation, University of New Mexico.
Morris, C. E., Thomson, B. M. and Stormont, J. C.: 1994, Assessment of dry barriers for containment of mobile constituents in the unsaturated zone, Sandia Report SAND94-2094, Sandia National Laboratories, Albuquerque, NM, p. 50.
Rogers, J. A., and Kaviany, M.: 1990, Variation of heat and mass transfer coefficients during drying of granular beds, J. Heat Transfer 112, 668-674.
Sallam, A., Jury, W. A. and Letey, J.: 1984, Measurement of gas diffusion coefficients under relatively low air-filled porosity, Soil Sci. Soc. Am. J. 48, 3-6.
Schl¨under, E.-U.: 1988, On the mechanism of the constant drying rate period and its relevance to diffusion controlled catalytic gas phase reactions, Chem. Engng. Sci. 43(10), 2685-2688.
Sherwood, T. K.: 1929, The drying of solids – I, Industr. Engng. Chem. 21(1), 12-16.
Stormont, J. C., Ankeny, M. D., Burkhard, M. E., Tansey, M. K. and Kelsey, J. A.: 1994, Assessment of an active dry barrier for a landfill cover system, Sandia Report SAND94-0301, Sandia National Laboratories, Albuquerque, NM, p. 51.
Thomson, B. M., Morris, C. E., Stormont, J. and Ankeny, M. D.: 1994, Development of dry barriers for containment and remediation at waste sites, WM '94, In: R. G. Post (ed.), Tucson, AZ, pp. 2193-2198.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Morris, C.E. Moisture Removal from a Two-Layer Porous Media: A Conceptual Model and Experimental Results. Transport in Porous Media 36, 23–42 (1999). https://doi.org/10.1023/A:1006563111997
Issue Date:
DOI: https://doi.org/10.1023/A:1006563111997