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A probabilistic study of the influence of parameter uncertainty on thermal radiation heat transfer

机译:参数不确定性对热辐射换热影响的概率研究

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摘要

The influence of uncertainty in the boundary conditions on the solution of the radiative transfer equation is studied using probabilistic methods. We consider the problem of a heated slab, the surfaces and volume of which are at fixed temperatures. The basic problem stemmed from the need to study a hypothetical accident scenario in a fast breeder nuclear reactor in the cover gas region which may contain a sodium aerosol. The emissivities of the surface of such a region will be uncertain and estimates must be made. We demonstrate how the uncertainties in these data parameters are transmitted to the solution of the associated transfer equation and define sensitivity coefficients for the configuration factors. We also consider a number of different material surfaces, the emissivities of which are only known within certain limits, and obtain sensitivity coefficients for them as well as mean values, variances and, in some cases, the probability distribution of the configuration factors. A variational method is used to solve the basic equation, but for more general problems where such methods are inapplicable we describe a technique based on polynomial chaos theory.
机译:利用概率方法研究了边界条件的不确定性对辐射传递方程解的影响。我们考虑加热板的问题,该板的表面和体积在固定温度下。基本问题源自需要研究在可能含有钠气溶胶的覆盖气体区域中的快速增殖核反应堆中假设的事故场景。这样的区域的表面的发射率将是不确定的,必须进行估计。我们演示了如何将这些数据参数中的不确定性传递到关联的传递方程的解中,并为配置因子定义灵敏度系数。我们还考虑了许多不同的材料表面,它们的发射率仅在特定限制内已知,并获得了它们的灵敏度系数以及平均值,方差以及某些情况下配置系数的概率分布。变分法用于求解基本方程,但是对于更通用的问题(其中此类方法不适用),我们描述了一种基于多项式混沌理论的技术。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第8期|1461-1472|共12页
  • 作者

    M.M.R. Williams;

  • 作者单位

    Applied Modelling and Computational Croup, Department of Earth Science and Engineering, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BP, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    data uncertainty; probability; polynomial chaos;

    机译:数据不确定性;可能性;多项式混沌;

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