Strong Near-Field Enhancement of Radiative Heat Transfer between Metallic Surfaces
Strong Near-Field Enhancement of Radiative Heat Transfer between Metallic Surfaces
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DOI：
10.1103/physrevlett.109.224302
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发表时间：
2012-11-27
影响因子：
8.6
通讯作者：
Horak, Michal
中科院分区：
文献类型：
--
作者：
Kralik, Tomas;Hanzelka, Pavel;Horak, Michal
实验研究了真空中平行平面钨层间间隙的近场传热，冷态样品温度在5 K附近，热态样品温度在10-40 K范围内，近场传热与差距尺寸d的关系。在间隙小于由维恩位移定律给出的峰值波长λ（m）的三分之一处，观察到近场效应。与黑体辐射相比，在d接近1 μ m时，获得了高百倍的热通量值。归一化到黑色表面之间传递的辐射功率的热通量显示出缩放（λ（m）/d）（n），其中n近似为2.6。本文介绍了在四个数量级的热通量范围内的实验结果以及与现有理论的比较。
Near-field heat transfer across a gap between plane-parallel tungsten layers in vacuo was studied experimentally with the temperature of the cold sample near 5 K and the temperature of the hot sample in the range 10-40 K as a function of the gap size d. At gaps smaller than one-third of the peak wavelength lambda(m) given by Wien's displacement law, the near-field effect was observed. In comparison with blackbody radiation, hundred times higher values of heat flux were achieved at d approximate to 1 mu m. Heat flux normalized to the radiative power transferred between black surfaces showed scaling (lambda(m)/d)(n), where n approximate to 2.6. This Letter describes the results of experiment and a comparison with present theory over 4 orders of magnitude of heat flux.