Anomalous near-field heat transfer between a cylinder and a perforated surface

TL;DR

This paper predicts and explains an unusual non-monotonic dependence of near-field radiative heat transfer between a cylinder and a perforated surface, influenced by geometry, temperature, and material properties.

Contribution

It introduces a heuristic dipole-plate interaction model to explain the anomalous heat transfer behavior considering material dispersion effects.

Findings

Non-monotonic heat transfer depends on separation, geometry, and temperature.

Nonmonotonicity occurs in polar dielectrics but not in metals with small skin depths.

Near-field effects significantly influence heat transfer in micron and submicron structures.

Abstract

We predict that the radiative heat-transfer rate between a cylinder and a perforated surface depends non-monotonically on their separation. This anomalous behavior, which arises due to near-field effects, is explained using a heuristic model based on the interaction of a dipole with a plate. We show that nonmonotonicity depends not only on geometry and temperature but also on material dispersion - for micron and submicron objects, nonmonotonicity is present in polar dielectrics but absent in metals with small skin depths.