کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8145420 1524093 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Scattering properties of solid rough surface of nickel skeleton
ترجمه فارسی عنوان
خواص پراکندگی سطح جامد خالص اسکلت نیکل
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک اتمی و مولکولی و اپتیک
چکیده انگلیسی
The micromorphology of solid skeleton makes a significant influence on the radiative transfer in metal foams. The modeling of complex morphology of rough surface and the prediction of bidirectional reflectance distribution function (BRDF) are the key issues for the radiative calculation of metal foam. In this work, a modeling method of analyzing and simplifying the complex rough surface using the SEM figures of metal foam's skeleton is introduced. This method is also used to predict the scattering properties of nickel foam's skeleton. Meanwhile, the hemispherical structures are used to replace the real convex structures on skeleton's surface. These hemispherical convex are located on the surface randomly, and the radius of adapted hemispherical convex respect the distribution function extracted from SEM statistic data. Furthermore, the FDTD method is adapted to predict the reflectivity and BRDF of simplified rough surfaces models. The results show that the reflectivity is affected by the size parameter obviously, while it's changed slightly by different incident angles. As for the BRDF of skeleton's rough surfaces, the value of main peaks increase obviously and the scopes of main peaks decrease with the size parameter increasing. The sub-peaks locate differently surrounding the main peaks, and then fuse gradually with the increasing size parameter. The sub-peaks vanish completely at the size parameter up to 6. When it comes to the hemispherical space, the reflection vary from anisotropic reflection to isotropic reflection except the mirror direction. At a larger size parameter, the reflection of rough surfaces can be simplified as the combination of mirror reflection and diffuse reflection. While at a small size parameter, the BRDF of rough surface need to be calculated accurately to reduce the error in the prediction of radiative transfer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Infrared Physics & Technology - Volume 93, September 2018, Pages 25-33
نویسندگان
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