Article

Near-Field Radiative Heat Transfer between Macroscopic Planar Surfaces

Department of Physics, University of Florida, Gainesville, 32611-8440, USA.
Physical Review Letters (Impact Factor: 7.51). 03/2011; 107(1). DOI: 10.1103/PhysRevLett.107.014301
Source: arXiv

ABSTRACT

Near-field radiative heat transfer allows heat to propagate across a small
vacuum gap in quantities that are several orders of magnitude greater then the
heat transfer by far-field, blackbody radiation. Although heat transfer via
near-field effects has been discussed for many years, experimental verification
of this theory has been very limited. We have measured the heat transfer
between two macroscopic sapphire plates, finding an increase in agreement with
expectations from theory. These experiments, conducted near 300 K, have
measured the heat transfer as a function of separation over mm to $\mu$m and as
a function of temperature differences between 2.5 and 30 K. The experiments
demonstrate that evanescence can be put to work to transfer heat from an object
without actually touching it.

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Available from: Bernard F. Whiting, May 02, 2014
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    • "Nanoscale radiative heat transfer has attracted a lot of attention in the last few years because of Polder and van Hove's prediction [1] on the possibility to observe heat fluxes at subwavelength distances which are several orders of magnitude larger than those obtained by the blackbody theory. Recent experimental results [2] [3] [4] [5] [6] [7] [8] [9] have confirmed these theoretical predictions [1] [10] [11]. "
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    ABSTRACT: The transport of heat mediated by thermal photons in hyperbolic multilayer metamaterials is studied using the fluctuational electrodynamics theory. We discuss the dependence of the attenuation length and the heat flux on the design parameters of the multilayer structure. We demonstrate that in comparison to bulk materials the flux inside layered hyperbolic materials can be transported at much longer distances, making these media very promising for thermal management and for near-field energy harvesting.
    Full-text · Article · Jun 2015 · Journal of Quantitative Spectroscopy and Radiative Transfer
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    • "All rights reserved. configurations clearly showed the evidence of ehnhancement of radiative transfer due to near-field effects above the Planck limit [10] [11] [12] [13] [14] [15] [16] [17]. An accurate modeling of nano- TPV energy conversion systems through the solution of the coupled near-field thermal radiation, charge and heat transport problem was provided by Francoeur et al. [18]. "

    Full-text · Dataset · Apr 2015
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    • "All rights reserved. configurations clearly showed the evidence of ehnhancement of radiative transfer due to near-field effects above the Planck limit [10] [11] [12] [13] [14] [15] [16] [17]. An accurate modeling of nano- TPV energy conversion systems through the solution of the coupled near-field thermal radiation, charge and heat transport problem was provided by Francoeur et al. [18]. "
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    ABSTRACT: Near-field thermal radiation with its many potential applications in different fields requires a thorough understanding for the development of new devices. In this paper, we report that near-field thermal emission between two parallel SiC thin films separated by a nano-gap, supporting surface phonon polaritons, as modeled via Finite Difference Time Domain Method (FDTD), can be enhanced when structured nanoparticles of different shapes and sizes are present on the surface of the emitting films. We compare different nano-particle shapes and discuss the configurations, which have the highest impact on the enhancement of near-field thermal emission and on the near-field heat flux. Convolutional Perfectly Matched Layer (CPML) boundary condition is used as the boundary condition of choice as it was determined to give the most accurate results compared against the other methodologies when working with sub-wavelength structures.
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