Abstract
Transport in high-conductivity porous media, such as metal foams, has many practical applications in the field of heat transfer. In order to numerically simulate the performance of devices incorporating such materials in a volume-averaged framework, it is necessary to have accurate estimates of all relevant effective properties, including the thermal dispersion conductivity. This chapter focuses on methods for determining the thermal dispersion conductivity, as well as other effective properties, in high-conductivity porous materials. Results are first presented for cylinder arrays with different particle shapes and arrangements. Following this, results for thermal dispersion are presented for an idealized graphite foam pore geometry and are used in volume-averaged simulations to evaluate the impact of the dispersion model on the overall heat transfer predictions. The overall finding of this review is that dispersion behaviour is complicated for all but the simplest pore geometries. Thus, any modelling efforts should consider the Reynolds and Prandtl numbers as separate influences, rather than lumping their effects into a relation based simply on the Péclet number.
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DeGroot, C.T., Straatman, A.G. (2012). Thermal Dispersion in High-Conductivity Porous Media. In: Delgado, J., de Lima, A., da Silva, M. (eds) Numerical Analysis of Heat and Mass Transfer in Porous Media. Advanced Structured Materials, vol 27. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30532-0_6
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DOI: https://doi.org/10.1007/978-3-642-30532-0_6
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