Entropy flow and generation in radiative transfer between surfaces
Entropy flow and generation in radiative transfer between surfaces
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2006.07.009
复制
发表时间：
2007-02
影响因子：
5.2
通讯作者：
Zhuomin M. Zhang;S. Basu
中科院分区：
文献类型：
--
作者：
Zhuomin M. Zhang;S. Basu
辐射熵已被用于推导黑体辐射定律和确定太阳能转换的最大效率。沿着热光伏技术和纳米尺度热辐射的发展，迫切需要确定多次反射时非理想表面间辐射传递的熵流和熵产。本文研究了在不考虑干涉和光子隧穿效应的情况下，考虑非相干多次反射时的熵流和熵的产生。本文应用局部平衡的概念解释了热辐射的单色辐射温度Tλ（λ，Ω），它既依赖于波长λ，又依赖于方向Ω。因此，熵通量和生成可以评估非理想表面。结果表明，在文献中发现的几个近似表达式可以导致显着的错误熵分析，即使是扩散灰色表面。本文的研究对非平衡热辐射的热力学研究有重要意义，对今后热光伏及其他辐射能转换器件的发展具有重要意义。
Entropy of radiation has been used to derive the laws of blackbody radiation and determine the maximum efficiency of solar energy conversion. Along with the advancement in thermophotovoltaic technologies and nanoscale heat radiation, there is an urgent need to determine the entropy flow and generation in radiative transfer between nonideal surfaces when multiple reflections are significant. This paper investigates entropy flow and generation when incoherent multiple reflections are included, without considering the effects of interference and photon tunneling. The concept of partial equilibrium is applied to interpret the monochromatic radiation temperature of thermal radiation, Tλ(λ,Ω), which is dependent on both wavelength λ and direction Ω. The entropy flux and generation can thus be evaluated for nonideal surfaces. It is shown that several approximate expressions found in the literature can result in significant errors in entropy analysis even for diffuse-gray surfaces. The present study advances the thermodynamics of nonequilibrium thermal radiation and will have a significant impact on the future development of thermophotovoltaic and other radiative energy conversion devices.