首页> 外文期刊>International Journal of Heat and Mass Transfer >A hybrid random walk method for the simulation of coupled conduction and linearized radiation transfer at local scale in porous media with opaque solid phases
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A hybrid random walk method for the simulation of coupled conduction and linearized radiation transfer at local scale in porous media with opaque solid phases

机译:一种混合随机游动方法,用于模拟具有不透明固相的多孔介质中局部尺度的耦合传导和线性辐射传输

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摘要

Heat transfer properties from ambient up to extremely high temperatures are a key feature of advanced thermal protection and thermal exchange materials - like ceramic foams or fiber assemblies. Because of their porous nature, heat transfer rests not only on conduction in opaque solids and on convection in pores, but also on radiation trough pores. The precise knowledge of the thermal behavior of these materials in these conditions is an issue. In a "virtual material" framework, we present a computational simulation tool for heat transfer in such materials, combining solid-phase conduction and linearized radiative transfer in open or closed radiating cavities with opaque interfaces. The software is suited to working in large 3D blocks as produced e.g. by X-ray CMT or by image synthesis. An original Monte-Carlo mixed random walks scheme accounting for both diffusion and radiation is presented and validated. The application to a real image of a fibrous medium is described and discussed, principally in terms of the influence of the diffusion/radiation ratio on the effective (large-scale) diffusivity tensor.
机译:从环境温度到极高温度的热传递特性是高级热保护和热交换材料(如陶瓷泡沫或纤维组件)的关键特征。由于其多孔性质,热传递不仅取决于不透明固体中的传导和孔中的对流,而且还取决于辐射槽中的孔。这些材料在这些条件下的热行为的精确知识是一个问题。在“虚拟材料”框架中,我们提出了一种计算模拟工具,用于在这种材料中进行传热,将固相传导和线性辐射传递与不透明界面的开放或封闭辐射腔相结合。该软件适合处理大型3D块,例如通过X射线CMT或图像合成。提出并验证了考虑了扩散和辐射的原始蒙特卡洛混合随机游走方案。主要根据扩散/辐射比对有效(大规模)扩散​​率张量的影响来描述和讨论在纤维介质的真实图像上的应用。

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