Abstract Coupled radiation-convection heat transfer inside a unit metal foam layer with high-flux irradiation is studied using improved scale-integrated simulation. It integrates the discrete-scale CFD simulation with that of continuum-scale via the multi-domain concept with thermal radiation effect considered. Conservations of mass flux and energy are satisfied on these specified subdomain interfaces, and a special defined transition zone with geometry-dependent functional quantities is introduced within the continuum-scale subdomain. This zone is adjacent to the discrete-scale subdomain which ensures a reasonable transition. Absorbed radiative fluxes and radiative heat transfer within the whole domain are calculated with Monte Carlo method and treated as heat sources. The problem under consideration has been investigated via the discrete-scale simulation, the continuum-scale simulation, and the scale-integrated simulation. The accurateness of scale-integrated simulation has been fully validated for predicting both flow field and heat transfer characteristics in comparison with the outcomes of discrete-scale simulation and other investigations. Deviations between the outcomes of continuum-scale simulation and discrete-scale simulation are found to be mainly caused by inconsistent local absorbed radiative heat fluxes distribution and impinging effect around the entry region. Up to 70% and 60% reduction of computation time and memory footprints are achieved when scale-integrated strategy is employed for the CFD simulation compared with the discrete-scale simulation. Meanwhile, the detailed fluctuated characteristics of the local concerned region and overall heat transfer performance can be precisely reflected. It may break up the computation limitations of the discrete-scale simulation in studying the energy transport process in foam based solar receiver applications.

中文翻译：

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高通量辐照下泡沫金属层中耦合辐射与对流的尺度集成模拟

摘要 使用改进的尺度集成模拟研究了具有高通量辐照的单元金属泡沫层内的耦合辐射-对流传热。它通过考虑热辐射效应的多域概念将离散尺度的 CFD 模拟与连续尺度的 CFD 模拟相结合。在这些指定的子域界面上满足质量通量和能量守恒，并且在连续尺度子域中引入了具有几何相关功能量的特殊定义过渡区。该区域与确保合理过渡的离散尺度子域相邻。整个域内的吸收辐射通量和辐射传热采用蒙特卡罗方法计算，并作为热源处理。已经通过离散尺度模拟、连续尺度模拟和尺度集成模拟研究了所考虑的问题。与离散尺度模拟和其他研究的结果相比，尺度集成模拟的准确性已得到充分验证，可用于预测流场和传热特性。发现连续尺度模拟和离散尺度模拟结果之间的偏差主要是由局部吸收的辐射热通量分布不一致和入口区域周围的撞击效应引起的。与离散尺度模拟相比，当 CFD 模拟采用尺度集成策略时，计算时间和内存占用减少了 70% 和 60%。同时，可以准确反映局部相关区域的详细波动特征和整体传热性能。它可以打破离散尺度模拟在研究基于泡沫的太阳能接收器应用中的能量传输过程的计算限制。