Near-field heat transfer between concentric cylinders

As a basic configuration, the concentric cylinder is used widely in a range of microstructures. We stud-ied 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 coor-dinates 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 concen-tric cylindrical systems. This work provides a new sight for efficient thermal management in near-field cylindrical conditions. (c) 2023 Elsevier Ltd. All rights reserved.