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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

GRAZING-ANGLE SCATTERING PEAK PHENOMENON IN THE SCATTERING OF ROUGH SURFACE

Get access (open in a dialog) DOI: 10.1615/IHTC16.rti.023513
pages 8369-8376

Abstract

The radiative properties of engineering surfaces with microscale surface textures depend on the incident wavelength, optical properties, and temperature as well as the surface parameters of the reflective surface. In a previous publication, we introduce the boundary condition equation (BCE) method to deal with the curved surface interface in finite-difference time-domain (FDTD) modeling. The improved FDTD method is applied to deal with scattering from weakly to very rough surfaces by directly solve the Maxwell's equations. The problem of interest is a set of one-dimensional surfaces with Gaussian random roughness distributions. The bi-directional reflectance distribution function (BRDF) of gold rough surfaces were obtained and compared with experimental data. The predicted values and experimental results are in good agreement. Also, the effects of the surface roughness, the correlation length and the incident angle on the BRDF properties of rough surfaces are analyzed to discuss the diffuse reflection, specular reflection, grazing-angle scattering peak and backscattering enhancements phenomena. The surface parameter domains for the regions of various phenomena are quantified and presented as a function of surface roughness and the surface slope. The results show that the grazing-angle scattering peak phenomena happens when the effective surface roughness is larger than 0.4, the surface slope is larger than 0.1 and smaller than 0.5.