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首页> 外文期刊>Journal of Heat Transfer >Estimation and Use of the Radiation Distribution Factor Median for Predicting Uncertainty in the Monte Carlo Ray-Trace Method
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Estimation and Use of the Radiation Distribution Factor Median for Predicting Uncertainty in the Monte Carlo Ray-Trace Method

机译：蒙特卡罗射线追踪法中不确定度的辐射分布因子中位数的估计和使用

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摘要

In a recent contribution, the authors show that the uncertainty in heat transfer results obtained using the Monte Carlo ray-trace (MCRT) method is related to the median of the radiation distribution factor probability density function (PDF). The value of this discovery would be significantly enhanced if the median could be known a priori without first computing the distribution factors. This would allow the user to determine the number of rays required to achieve the desired accuracy of a subsequent heat transfer analysis. The current contribution presents a correlation for the median of the distribution factor PDF as a function of emissivity and the number of surface elements defining an enclosure. The correlation involves a single parameter whose value is unique for a given enclosure geometry. We find that the radiation behavior of a given enclosure can be classified on a scale ranging from reflection-dominated to geometry-dominated. The correlation is shown to work well for reflection-dominated enclosures but less well for geometry-dominated enclosures.
机译：在最近的贡献中，作者表明，使用蒙特卡洛射线迹线（MCRT）方法获得的传热结果的不确定性与辐射分布因子概率密度函数（PDF）的中值有关。如果在不先计算分布因数的情况下就可以事先知道中位数，则该发现的价值将得到显着提高。这将允许用户确定实现后续传热分析的所需精度所需的射线数量。电流贡献表示分布系数PDF中位数与发射率和定义外壳的表面元素数量之间的关系。相关涉及单个参数，其值对于给定的外壳几何形状而言是唯一的。我们发现，给定外壳的辐射行为可以按从反射控制到几何控制的范围进行分类。该相关性对反射为主的外壳显示良好的效果，但对于几何为主的外壳则效果较差。

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