The theory of heat and moisture transfer in porous media revisited |
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| Affiliation: | 1. Department of Physics, Martin Luther University Halle, 06099 Halle, Germany;2. Department of Physics, Faculty of Science, Minia University, 61519 Minia, Egypt;3. Institute of Ionic-Plasma and Laser Technologies (Institute of Electronics), 700187 Tashkent, Uzbekistan;4. Ioffe Physico-Technical Institute, St Petersburg 194021, Russia;5. St Petersburg State Polytechnical University, St Petersburg 195251, Russia;1. Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic;2. Academy of Science of the Czech Republic, Nuclear Physics Institute, CZ-250 68 Husinec-Řež, Czech Republic;3. Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany;1. Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland;2. Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia;3. Space Research Centre, Polish Academy of Sciences, Bartycka 18A, 00-716 Warsaw, Poland;1. Institute of Heating, Ventilating and Air Conditioning, School of Mechanical Engineering, Tongji University, 200092, Shanghai, China;2. Department of Hygrothermics, Fraunhofer Institute for Building Physics, 83626, Holzkirchen, Germany |
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| Abstract: | In this paper a review is presented of the present status of the theory of combined heat and moisture transfer in porous media, developed by J. R. Philip and the author in the mid-1950s. First, attention is drawn to the limitations of the theory and the assumptions underlying it. Next, attempts to test the theory by laboratory and field experiments are briefly discussed, leading to the conclusion that the usefulness of the theory in describing and analysing the experiments was proven, but that doubts remain about its predictive value. These doubts are a consequence of: (a) the limitations of the theory; (b) uncertainty about the quality of the experimental procedures and data. Remarks are made on hysteresis and its possible influence. It is concluded that experiments aimed at a study of the behaviour of nonisothermal systems subjected to hysteresis are needed. Finally, the problem of the definition and use of an apparent thermal conductivity is analysed. In the original papers two alternatives were presented. An expression for the phase average of the vapour flux density is derived. A numerical example is presented and suggestions are made concerning the proper choice between the alternatives. |
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