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The Study of Radiative Heat Transfer with the Bidirectional Reflectance Distribution Function Wall

Author: ChenJie
Tutor: ChengQiang
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Reverse Monte Carlo method Bidirectional reflectance distribution function Radiativetransfer equation Radiation heat Radiation intensity
CLC: TK124
Type: Master's thesis
Year: 2012
Downloads: 5
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Abstract


The actual radiation system, wall radiation conditions neither gray diffuse reflection,nor gray mirror reflection. Rough surface BRDF (Bidirectional Reflectance DistributionFunction, abbreviated as BRDF) are united in the same concept of reflction and scatter, notonly can describe the surface of the optical radiation characteristics, but also be able todescribe the direction scattering characteristics. Rough surface bidirectional reflectancedistribution function can describe the wall’s reflection, absorption and radiationcharacteristic. It has important implications for the study of the actual radiation system. Thedetails are as follows:With the development of technologies such as optical imaging, flame measurement,combustion diagnosis, solving the intensity of the radiation of the high direction resolutionhas important significance. Reverse Monte Carlo method tracks from those beams thateventually reach the detector, making the problem more effectively. Firstly, this paper givesa detailed introduction of the Reverse Monte Carlo method. In order to verify thecorrectness of the Reverse Monte Carlo method, this paper checks and analyzes the ReverseMonte Carlo method in isotropic scatter, anisotropic scatter, gradient refractive index of themedium in radiative transfer problem, and calculated radiation intensity, radiation heat flux.The results are consistent with well. Thus demonstrating the correctness of the ReverseMonte Carlo method.Considering radiative heat transfer of the bidirectional reflectance distribution functionwal, firstly obtaining bidirectional reflectance distribution function of the experimental data,selecting the appropriate experience/semi-empirical model, and using a genetic algorithmto optimize the function model Parameters, and then applying to the one-dimensional graysexual parallel plate system. In order to verify the correctness of the radiative transferproblem, this paper uses the Reverse Monte Carlo method and DRESOR method tocalculate the radiation intensity, the radiation heat flux. The results are consistent with well.Thus demonstrating the correctness of problem. Compared with diffuse reflection wall, thispaper gives the effects of the bidirectional reflectance distribution function wall.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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