A three-energy-equation model for individual phases in porous media was developed to analyze forced convective heat transfer in a solar volumetric receiver composed of dual-structured porous media. The model comprises three energy equations: one for air and two for heat conduction in the small- and large-scale solid structures. These equations were fully coupled to derive exact analytical solutions for the axial temperature distributions within the volumetric receiver. The model was used to investigate the influence of key parameters, such as the volume fraction of the filler (small rods), the...
