Japan Geoscience Union Meeting 2016

Presentation information

International Session (Poster)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-GE Geological & Soil Environment

[A-GE05] Subsurface Mass Transport and Environmental Assessment

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Shoichiro Hamamoto(Department of Biological and Environmental Engineering, The University of Tokyo), Yasushi Mori(Graduate School of Environmental and Life Science, Okayama University), Hirotaka Saito(Department of Ecoregion Science, Tokyo University of Agriculture and Technology), Ken Kawamoto(Graduate School of Science and Engineering, Saitama University), Ming Zhang(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology)

5:15 PM - 6:30 PM

[AGE05-P13] Thermal non-equilibrium between solid and liquid phases in forced convective heat transport

*Toshiyuki Bandai1, Shoichiro Hamamoto1, Hiromi Imoto1, Taku Nishimura1, Toshiko Komatsu2 (1.Deptartment of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, University of Tokyo, 2.Graduate School of Science and Engineering, Saitama University)

Keywords:Thermal equilibrium, Thermal non-equilibrium, Thermal dispersion

The thermal equilibrium between the solid and the liquid phases is generally assumed for numerical simulations in heat transport through soils. However, the validation of this assumption is not well examined, especially in heat transport through coarse materials that have low thermal conductivity. In this study we conducted one-dimensional heat transport experiments using different size fractions of glass beads and plastic balls to examine the validation of thermal equilibrium assumption. In the experiments, hot water (38℃) was injected to the 50-cm long column packed with glass beads or plastic balls. The temperatures of the solid and liquid phases were measured independently. The convection-dispersion equation with the assumption of the thermal equilibrium was applied to the measured thermal responses under different water fluxes. We found that thermal conductivity of the materials was not a dominant factor that affects thermal equilibrium between solid and fluid phases. In addition, the thermal dispersion coefficient obtained by applying the convection-dispersion equation to the thermal responses in the solid phase and fluid phase were similar.