Research On Near-field Radiative Heat Transfer Between Particles In A Complex System

Due to the tunneling effect of evanescent wave,when the distance between objects is less than the thermal wavelength,the radiation heat transfer will break through the limit of Planck’s black body law and get several orders of magnitude enhancement.At this time,the radiation of objects is called near-field radiation.With the continuous progress of micro-nano scale manufacturing technology,near field radiation has shown great application potential and attracted extensive attention of researchers.When additional objects are introduced between two particles,the nearfield radiation heat transfer between particles will be enhanced due to the multi-body effect,and the shape,scale and material properties of the object will have an impact on the near-field radiation heat transfer between particles.In this paper,according to previous studies,using the Green’s function of objects around particles to describe the boundary conditions of multi-body system,deduced the formula of radiant heat transfer between particles in multi-body system,studied the problem of radiant heat transfer between particles in sphere system,cylinder system and plate system,and explored the regulating effect of objects on radiant heat transfer between particles.In this paper,the near-field thermal radiation model between two particles around the sphere is constructed,and the radiative heat transfer between SiC particles mediated by the sphere is calculated.The results show that when the SiC sphere is between particles,the radiation heat transfer between particles is enhanced due to phonon polarization coupling,and when the Au sphere is between particles,the radiation heat transfer between particles is enhanced due to diffraction effect.Based on the calculation of the sphere,the near-field thermal radiation model between two particles around the cylinder is established for the first time to calculate the radiative heat transfer between SiC particles mediated by the cylinder.The results show that both SiC cylinder and Au cylinder can enhance the radiation heat transfer between particles,and the particle phonon polarization is coupled with the SiC cylinder phonon polarization.Due to the coupling of different polarizations in Au cylinder,the enhancement effect of Au cylinder is more significant.The radiative heat transfer between particles can be controlled by changing the shape and radius of the objects and the geometry of the particles.Finally,the radiation heat transfer between SiC particles mediated by single and double plates is calculated.The results show that when the SiC plate material is SiC,the phonon polarization is coupled with the surface phonon polarization of the single plate or the double plate,and the radiation heat transfer between the particles is enhanced.When the graphene is covered with the double plate,the phonon polarization coupling between the particles and the plate is inhibited.When the plate material is Au,due to the surface mode of the unexcited metal,the single plate has little effect on the radiant heat transfer between the particles,but the radiant heat transfer between the two plates is enhanced because the double plate has more significant effect on the dipole moment of the particles in different directions.Radiative heat transfer between particles can be controlled by changing plate spacing,plate material and plate number.