Coupling between conduction and near-field radiative heat transfer in tip-plane geometry

TL;DR

This paper investigates how conduction and near-field radiative heat transfer interact in a tip-plane setup, revealing a flux saturation mechanism at nanometer scales that can be experimentally observed.

Contribution

It provides a detailed analysis of the coupling between conduction and near-field radiative transfer, highlighting flux saturation effects without non-local phenomena.

Findings

Flux saturation occurs at 1-10 nm separations for polar materials.

Coupling affects heat transfer rates in near-field regimes.

Analysis applicable to metals and polar materials.

Abstract

We analyze the coupling between conduction and radiative heat transfer in near-field regime between two coaxial cylinders separated by a vacuum gap. By solving the heat transport equation in the steady-state regime between metals or polar materials we highlight a flux saturation mechanism for the radiative transfer even without non-local effect. In the case of polar materials this saturation occurs in the separation distances range of 1 to 10 nm which can be experimentally explored.