偏振度对均匀折射率介质内矢量辐射传输过程中辐射熵产的影响

Effect of polarization degree on radiation entropy generation generated in uniform index medium for vector radiative transfer process

在半透明均匀折射率介质内矢量辐射传输过程中辐射熵传递方程及其数值模拟方法的基础上,研究了偏振度对矢量辐射传输过程中辐射熵产的影响。均匀折射率介质内辐射光束的起偏和改偏通过相距阵实现。计算结果表明:由介质内吸收发射过程的不可逆性产生的光谱辐射熵产数随着偏振度增加而减小,而由介质散射过程的不可逆性产生的光谱辐射熵产数随着偏振度增加而增加;偏振度对介质内的光谱辐射熵强度的影响很大,若不考虑偏振,光谱辐射熵强度的相对误差最大可达到18.04%;在整个系统中,光谱辐射熵产数满足热力学第二定律。

Based on the radiative entropy transfer equation of semitransparent uniform index medium for vector radiative transfer process,the effect of polarization degree on spectral radiation entropy generation generated in vector radiative transfer process was analyzed.The polarizing of radiation beam and varization of polarization degree were achieved by phase matrix.The results show that the spectral radiation entropy number due to the irreversibility of medium absorption and emitting process increases with the increase of polarization degreee,and that due to the irreversibility of medium scattering process decreases.The effect of polarization degree on spectral radiative entropy intensity is large,the maximum reletavie error could reach 18.04%.The whole spectral radiation entropy generation number of the slab agrees well with the entire second law thermodynamic analysis.