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Near Field Heat Transfer: Where Radiation Becomes Conduction

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We show in this article that the radiative heat transfer exchanged in the near field can be interpreted as a conduction heat transfer due to the propagation of optical phonons. We consider two situations. In the first one, two heated bodies at different temperatures are separated by a gap and in the second one a temperature gradient is imposed to a bulk material. In both situations, the radiative heat transfer is calculated by means of fluctuational electrodynamics in order to take into account near field effects. Asymptotic expressions of a thermal conductivity are obtained from the radiative heat transfer calculation. We interpet this conductivity as a consequence of the heat transfer by propagation of optical longitudinal phonons.
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Document Type: Research Article

Publication date: February 1, 2008

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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