Radiative heat exchange of spherical particles with metal and insulator plates

TL;DR

This paper investigates the radiative heat exchange involving spherical particles and plates made of gold and silica, proposing a new additive dipole approximation and comparing various models with experimental data.

Contribution

It introduces an additive dipole approximation for thermal conductance of micrometer-sized particles and compares multiple theoretical models with experimental results.

Findings

The additive dipole approximation provides accurate thermal conductance estimates.

Comparison of models highlights the most reliable approaches.

Numerical results align well with experimental data.

Abstract

Radiative heat exchange of spherical particles between each other and with thick polarizable plates is studied in the framework of fluctuation electrodynamics. An additive dipole approximation for the thermal conductance of micrometer sized particles is proposed. The numerical calculations are performed for particles and plates made of gold and silica. Several theoretical models of radiative conductance are compared and juxtaposed with the known experimental data.