Fluctuations of radiative heat exchange between two bodies

Abstract

We present a theory to describe the fluctuations of nonequilibrium radiative heat transfer between two bodies both in far and near-field regime. As predicted by the blackbody theory, in far field, we show that the variance of radiative heat flux is of the same order of magnitude as its mean value. However, in near-field regime we demonstrate that the presence of surface polaritons makes this variance more than one order of magnitude larger than the mean flux. We further show that the correlation time of heat flux in this regime is comparable to the relaxation time of heat carriers in each medium. This theory could open the way to an experimental investigation of heat exchanges far from the thermal equilibrium condition.

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Cited by in corpus (6)

• Heat transfer statistics in extreme-near-field radiation
• Signature of resonant modes in radiative heat current noise spectrum
• General trace formula for heat flux fluctuations
• Time-dependent radiative heat flux after the beginning of thermal radiation
• Scattering approach to near-field radiative heat transfer
• Fluctuations of the energy density and intensity for arbitrary objects in an arbitrary environment