论文标题
雷利 - 贝纳德对流实验中的热辐射
Thermal Radiation in Rayleigh-Bénard Convection Experiments
论文作者
论文摘要
湍流雷利 - 纳德对流（RBC）中的一个重要问题是对流热传输的有效性，通过rayleigh（$ {\ rm {rm {ra}}} $）和prandtl（$ {prandtl（prandtl（prandtl（prandtl），在RBC实验中，供应到底板的热量也部分通过热辐射转移。该热传输通道与对流和导电传输通道并行作用，通常被认为是微不足道的，因此被忽略了。在这里，我们对各种RBC实验中发生的常规远场以及强烈增强的近场辐射热传输进行了详细分析，并表明辐射热传递部分解释了在不同实验中测得的$ {\ rm {nu}} $的差异。谨慎地包含辐射运输，明显地改变了$ {\ rm {nu}} = {\ rm {\ rm {nu}}}（{\ rm {ra}}）$在湍流的RBC实验中推断出的缩放量表在湍流的RBC实验中，在环境温度附近，利用气体氮气和硫磺素赫尔弗鲁斯（Hexafluoride）工作。另一方面，常规的远场辐射和强烈增强的近场辐射热传输都不会显着影响在低温氦RBC实验中推论的热传输法。
An important question in turbulent Rayleigh-Bénard convection (RBC) is the effectiveness of convective heat transport, which is conveniently described via the scaling of the Nusselt number (${\rm{Nu}}$) with the Rayleigh (${\rm{Ra}}$) and Prandtl (${\rm{Pr}}$) numbers. In RBC experiments, the heat supplied to the bottom plate is also partly transferred by thermal radiation. This heat transport channel, acting in parallel with the convective and conductive heat transport channels, is usually considered insignificant and thus neglected. Here we present a detailed analysis of conventional far-field as well as strongly enhanced near-field radiative heat transport occurring in various RBC experiments, and show that the radiative heat transfer partly explains differences in ${\rm{Nu}}$ measured in different experiments. A careful inclusion of the radiative transport appreciably changes the ${\rm{Nu}}={\rm{Nu}}({\rm{Ra}})$ scaling inferred in turbulent RBC experiments near ambient temperature utilizing gaseous nitrogen and sulphur hexafluoride as working fluids. On the other hand, neither the conventional far-field radiation nor the strongly enhanced near-field radiative heat transport appreciably affects the heat transport law deduced in cryogenic helium RBC experiments.
