摘要
从半透明体的内部介质辐射出发，采用正、逆向光线跟踪法对具有温度分布的半透明大平板的发射特性进行了研究，得到表面的方向有效发射率的解析表达式。利用该式对具有线性温度分布的半透明大平板的发射特性进行计算，分析了温度分布、光学厚度以及介质折射率对方向有效发射率和半球有效发射率的影响。
ccording to the medium's internal thermal emission mechanism,the emitting properties of a semi-transparent slab was investigated with the ray-tracing method. The slab has a given temperature profile and smooth surfaces.An analytical expression for calculating the effective direction emissivity of the surface was derived.Then,this expression was applied to calculate the effective surface emissivity of a semi-transparent slab with a linear temperature profile. The calculated results show that the temperature profile together with the optical thickness and the medium's refractive index affect the surface's effective direction and hemispheric emissivities.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
1996年第3期245-251,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金
