Using Inverse Analysis to Tailor Micro-Nanopatterned Surfaces for Desired Spectrally and Directionally Dependent Radiative Properties

[32415]然而，某些材料表面非常小（纳米到微米尺度）的几何特征会导致热辐射发射或吸收具有明显的方向和波长变化。对这种定制表面进行了研究，并对其特性进行了预测和实验验证。然而，在设计重要的辐射器件时，首先确定特定应用所需的理想方向和波长特性，然后确定将提供这些特性的表面纹理和器件几何形状，这将是有用的。智力优势：本研究包含一个逆数学问题，具有众所周知的数学困难。这些困难将得到解决，从而产生一种设计方法，用于识别特定的微纳米级表面结构，这些结构将提供所需的定向和光谱辐射发射和吸收特性。因此，需要进行的基础研究是开发可应用于微纳尺度的逆分析方法，并通过实验对比验证该方法的有效性，并将其应用于实际。更广泛的影响：优化辐射特性的稳健逆设计方法具有重要的应用，包括但不限于提高太阳能集热器、光伏阵列、照明和辐射加热器的效率。这项研究将支持一名博士后以及研究生和本科生的研究人员。研究结果可以纳入辐射传热的研究生课程和教材中。

1032415HowellVery small (nano- to micrometer scale) geometric features on the surface of certain materials can cause thermal radiation emission or absorption to have pronounced directional and wavelength variations. Such tailored surfaces have been studied and their characteristics predicted and experimentally verified. In the design of important radiating devices, however, it would be useful to first identify the desirable directional and wavelength characteristics needed for a particular application, and subsequently determine the surface texture and device geometry that will provide these characteristics. Intellectual Merit: This research comprises an inverse mathematical problem, with well-known mathematical difficulties. These difficulties will be addressed resulting in a design method for indentifying specific micro- and nano-scale surface structures that will provide desired directional and spectral radiative emissive and absorptive properties. Therefore, the fundamental research to be performed is to develop inverse analysis methods that can be applied at the micro-nano scale, and to demonstrate that such methods can be validated through comparison with experiment and applied for practical use.Broader Impacts: A robust inverse design method for optimizing radiative properties has important applications including but not limited to improving the efficiency of solar collectors, photovoltaic arrays, lighting and radiant heaters. The research will support a post doctoral student as well as graduate and undergraduate researchers. The results can be incorporated into graduate courses and texts in radiation heat transfer.