半透明随形粒子形貌对近场辐射的影响研究

In this paper, the translucent particle material is taken as the research object, by transforming the surface roughness of particles, near-field radiation transmission models of morphology particles are established. The time-domain finite difference dipole method is introduced to simulate the radiation fluctuation current of particles and radiative heat transfer. The correctness of this method is verified by comparing with the analytical solution of spherical particles, the near-field radiation characteristics between random surface particles are also analyzed. The research results show that in the range of 1∼10 μm, as the surface roughness increases, the radiative thermal conductivity gradually decreases, and the relative deviation from the spherical particles is below 5%.