封闭腔不透明表面辐射传递系数统计分析

Statistical analysis on radiation transfer factor of opaque surfaces in enclosure

基于蒙特卡罗法定义封闭腔内不透明表面辐射换热的辐射传递系数,并与角系数、哥布哈特系数进行比较,发现其在反映综合考虑表面材料物性以及空间几何位置的能量传输特性过程中更具有通用性。统计分析辐射传递系数概率分布和置信度水平,推导封闭腔内辐射传递系数的平均相对和绝对误差公式,为用蒙特卡罗法求解辐射换热中所确定的计算精度和计算工作量提供了参考依据。

Radiation transfer factor of opaque surfaces in enclosure was defined in the paper. It based on Monte-Carlo methods and applied widely more comparing with configuration factor and Gebhart＇s factor in the course of radiation energy transfer considered comprehensive materials properties and space geometry position of surfaces. The probability and confidence level were carried out by statistical analyzed methods and the mean relative and absolute error equation were deduced. It supplied the basic reference of calculation precision and capacity for solving the radiation heat transfer using Monte-Carlo methods.