Abstract
Radiative heat transfer (RHT) between two metallic nanoparticles clusters in both near field and far field areexplored using many-body radiative heat transfer theory implemented with the coupled electric and magneticdipole (CEMD) approach, which effectively takes into account the contribution of magnetic polarization ofmetallic nanoparticles on heat exchange. The effects of magnetic polarization, many-body interaction (MBI),fractal dimension, and relative orientation of the clusters on RHT were analyzed. The results show thatthe contribution of magnetically polarized eddy-current Joule dissipation dominates the RHT between Agnanoparticle clusters. If the electric polarization (EP approach) only is considered, the heat conductance will beunderestimated as compared with the CEMD approach in both near field and far field regime. The effect of MBIon the RHT between Ag nanoparticle clusters is insignificant at room temperature, which is quite different fromthe SiC nanoparticle clusters. For the latter, MBI tends to suppress RHT significantly. The relative orientationhas remarkable effect on radiative heat flux for clusters with lacy structure when the separation distance is in thenear field. While for the separation distance in far field, both the relative orientation and the fractal dimensionhas a weak influence on radiative heat flux. This work will help the understanding of thermal transport in denseparticulate system.