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EXPERIMENTAL STUDIES OF RADIATIVE HEAT TRANSFER BETWEEN BODIES AT SMALL SEPARATIONS

DOI: 10.1615/AnnualRevHeatTransfer.v16.110
pages 327-343

Sheng Shen
Department of Mechanical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, 408 B Scaife Hall, Pittsburgh, PA 15213-3890, USA

Abstract

Radiative heat transfer between bodies can be significantly enhanced beyond Planck's law in the near field due to photon tunneling. Extensive theoretical work was reported to study near-field radiation between bodies with different geometries and materials. Although experi-mentally measuring heat transfer at small gaps is very difficult, many advanced experimental techniques have been developed to measure near-field radiative heat transfer over the past decades. The aim of this chapter is to give an in-depth review about those experimental techniques, measured results, and their comparison with theoretical predictions. The previous experimental studies are categorized in terms of three configurations: parallel-plate, tip-plate, and sphere-plate. Future directions of measuring near-field radiation are also discussed.