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Novel Mixing Relations for Determining the Effective Thermal Conductivity of Open-Cell Foams |
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| Authors: | Jesus Nain Camacho Hernandez Guido Link Markus Schubert Uwe Hampel |
| Affiliation: | 1.Institute for Pulsed Power and Microwave Technology IHM, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Karlsruhe, Germany;2.Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany; (M.S.); (U.H.);3.Chair of Imaging Techniques in Energy and Process Engineering, Technische Universität Dresden, 01062 Dresden, Germany |
| Abstract: | This paper proposes a new approach to relate the effective thermal conductivity of open-cell solid foams to their porosity. It is based on a recently published approach for estimating the dielectric permittivity of isotropic porous media. A comprehensive assessment was performed comparing the proposed mixing relation with published experimental data for thermal conductivity and with numerical data from state-of-the-art relations. The mixing relation for the estimation of thermal conductivities based on dodecahedrons as building blocks shows good agreement with experimental data over a wide range of porosity. |
| Keywords: | open-cell foams effective permittivity thermal conductivity platonic solids |