参与介质中一维辐射传递的有效性

IF 1.1 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Thermophysics and Heat Transfer Pub Date : 2023-10-06 DOI:10.2514/1.t6850

Walter W. Yuen

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引用次数: 0

摘要

对于平面吸收散射介质的辐射传输，检验了一维假设的有效性。利用蒙特卡罗广义分区法作为求解器，生成了精确的数值解，以确定一维假设成立的条件。具体来说，对于准直或漫射能量束通过平板的透射率和反射率的预测，给出了数值数据，表明中等长径比(宽度与厚度之比)大于等于5是数据与一维结果一致的必要条件，但不是充分条件。讨论了这一条件对一维辐射传递假设在管道流动和保温等实际工程问题中应用的意义。

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Validity of One-Dimensional Radiative Transfer in Participating Media

For radiative transfer through an absorbing, scattering medium with planar geometry, the validity of the one-dimensional assumption is examined. Using the generalized zonal with Monte Carlo method as a solver, exact numerical solutions are generated to identify conditions under which the one-dimensional assumption is valid. Specifically, for the predictions of transmissivity and reflectivity for a collimated or diffuse energy beam through a planar slab, numerical data are presented to show that a medium aspect ratio (ratio of the width to the thickness) of five or more is a necessary but not sufficient condition for the data to agree with the one-dimensional result. The implication of this condition on the utilization of the one-dimensional radiative transfer assumption in some practical engineering problems such as pipe flow and thermal insulation is discussed.

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来源期刊

Journal of Thermophysics and Heat Transfer 工程技术-工程：机械

CiteScore

3.50

自引率

19.00%

发文量

审稿时长

3 months

期刊介绍： This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.