Numerical simulation for the determination of the radiative properties of spherical packed bed porous media: A COMSOL Multiphysics Study

Abstract

The determination of the radiative properties of porous media has become a critical issue in various industrial and engineering applications. The aim of this paper is to characterize the radiative heat transfer process through porous media, assumed to be spherical packed beds. A prediction model was developed using the software COMSOL Multiphysics to simulate the interaction of each of the three proposed structures with a plane-heating surface. The distribution of normalized fluxes was assessed allowing the computation of effective radiative properties, namely the transmissivity, reflectivity, and absorptivity for diffusely and specularly reflecting particles. The results show that the arrangement of the particles has a noticeable influence on the media properties. Two layers of the third model were enough to obtain an opaque surface. Correlations have been developed to allow effective reflectivity, transmissivity, and absorptivity coefficients to be easily and accurately defined as a function of emissivity in future models. The suitability of the proposed models was discussed through a comparative study of the results found using numerical simulations with analytical calculations, with a good agreement obtained.

Identification of the Effective Radiative Properties of Cylindrical Packed Bed Porous Media

“…Additionally, it can contribute to the enhancement of HVAC systems, allowing for better control of indoor temperatures and increased energy efficiency in both residential and commercial settings. The implications extend to the automotive industry, where optimized thermal By comparing the obtained results to those presented in another study on spherical packed bed porous media [32], it can be noted that spherical packed configurations facilitate the quicker attainment of an opaque medium. They also appear to be more reflective and absorptive in comparison to a cylindrical packed bed porous media.…”

Polarization Characterization of Porous Particles Based on DDA Simulation and Multi-Angle Polarization Measurements

“…On the other hand, for theoretical calculations of irradiation properties of porous particles, current models based on FDTD [37], FEM [38], and DDA [30,39,40] have various limitations in disordered arrangement, connectivity, openness and setup independence of pore structures. In contrast, the proposed overlapping sphere model has advantages in solving these problems.…”