Near-field thermal electromagnetic transport: An overview
详细信息 查看全文
- 作者：Sheila Edalatpour ; sheila.edalatpour@utah.edu" class="auth_mail" title="E-mail the corresponding author ; John DeSutter ; Mathieu Francoeur ; mfrancoeur@mech.utah.edu" class="auth_mail" title="E-mail the corresponding author
- 关键词：Near-field thermal electromagnetic transport ; Electromagnetic scattering ; Thermal discrete dipole approximation ; Near-field radiative heat transfer between three spheres
- 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：178
- 期：Complete
- 页码：14-21
- 全文大小：1250 K
文摘
A general near-field thermal electromagnetic transport formalism that is independent of the size, shape and number of heat sources is derived. The formalism is based on fluctuational electrodynamics, where fluctuating currents due to thermal agitation are added to Maxwell’s curl equations, and is thus valid for heat sources in local thermodynamic equilibrium. Using a volume integral formulation, it is shown that the proposed formalism is a generalization of the classical electromagnetic scattering framework in which thermal emission is implicitly assumed to be negligible. The near-field thermal electromagnetic transport formalism is afterwards applied to a problem involving three spheres with size comparable to the wavelength, where all multipolar interactions are taken into account. Using the thermal discrete dipole approximation, it is shown that depending on the dielectric function, the presence of a third sphere slightly affects the spatial distribution of power absorbed compared to the two-sphere case. A transient analysis shows that despite a non-uniform spatial distribution of power absorbed, the sphere temperature remains spatially uniform at any instant due to the fact that the thermal resistance by conduction is much smaller than the resistance by radiation. The formalism proposed in this paper is general, and could be used as a starting point for adapting solution methods employed in traditional electromagnetic scattering problems to near-field thermal electromagnetic transport.