Near-field heat transfer between concentric cylinders

As a basic configuration, the concentric cylinder is used widely in a range of microstructures. We studied the near-field radiative heat transfer (NFRHT) in a concentric cylindrical system, based on Green's function formalism and fluctuation-dissipation theory. A general formula was derived in cylindrical coordinates to study heat transfer both for far- and near-field, and SiO₂ was used as an example to illustrate it. Three relations of heat transfer between concentric cylinders is explored in different configuration. Monochromatic heat transfer can be achieved by adjusting the radius at a specific distance. Additionally, we found that the radiation expressed in terms of polarization is not suitable in the NFRHT of concentric cylindrical systems. This work provides a new sight for efficient thermal management in near-field cylindrical conditions.