【摘 要】
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Near-field radiative thermal transport has attracted increasing attention recently,with orders-of-magnitude heat transfer enhancement already demonstrated b
【机 构】
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DepartmentofMechanicalEngineering,UniversityofMichigan,USA
【出 处】
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The 2nd International Conference on Phononics and thermal En
论文部分内容阅读
Near-field radiative thermal transport has attracted increasing attention recently,with orders-of-magnitude heat transfer enhancement already demonstrated between bulk materials.Using a novel custom-built experimental platform,we conducted a systematic investigation of the effect of film thickness on the near-field heat transport properties.By studying thermal radiation between a hot silica microsphere and thin silica films of varying thicknesses(50 nm to 3 microns),at different gap sizes(30 nm to 10 microns),we found substantial enhancements in heat transport properties due to near-field effects,even for the thinnest films when the gaps size was comparable to the film thickness.Further,we find that at larger separations(~1 micron),the thicker films show substantially larger near-field enhancement than thinner films.These results provide the first direct evidence of a distance dependent penetration depth in thin films.
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