Study of heat and moisture transfer in soil with a dry surface layer |
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| Affiliation: | 1. KU Leuven, Department of Civil Engineering, Building Physics Section, Belgium;2. Technical University of Denmark, Department of Civil Engineering, Section of Building Physics and Services, Denmark;3. Dresden University of Technology, Institute of Building Climatology, Germany;1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;1. Laboratory for Multiscale Studies in Building Physics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;2. Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, CH-8093 Zürich, Switzerland;3. Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;4. Road Engineering/Sealing Components Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;5. Laboratory for Electronics/Metrology/Reliability, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;6. Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;7. Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;8. Chair of Building Physics, ETH Zürich, CH-8093 Zürich, Switzerland |
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| Abstract: | Mathematical model for describing simultaneous heat and moisture transfer in the porous soil with a dry surface layer was developed by using the volume-averaging method. Numerical simulation was conducted to investigate water evaporation, transient distributions of temperature and moisture in the porous soil at environmental conditions, which might be useful for agricultural application. In order to validate the mathematical model and numerical method, an experiment was conducted under natural environmental conditions. An additional experiment was conducted in a closed-loop wind tunnel to investigate the temperature effect on soil moisture transport. Theoretical and experimental results indicate that the dry surface layer has an important effect on heat and moisture migration in soil and the influence of temperature on moisture transport in unsaturated soil is significant. |
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