A key challenge to model the heat transfer in refractory ceramic foams at high temperature is to characterize properly the transport of thermal radiation, especially when the foams are directly exposed to a high irradiation beam such as concentrated solar radiation. Characterization of the radiation transport in a single strut is representative and fundamental for the radiation transfer modelling of foams. This study numerically investigates the radiation transport and temperature response in a real foam strut under high irradiation beam. The digitalized strut was obtained by the X-ray micro-computed tomography imaging measurements, and then meshed within the strut volume and on the surface. The Discrete Ordinate Method is used to solve the Radiative Transfer Equation, since the strut material (alumina ceramic) is by nature semitransparent for incident radiation, resulting absorbing, scattering and emitting inside the solid phase. The volumetric propagation of radiation intensity is tracked and the absorbed radiation energy is recorded. Besides, the temperature response of the strut irradiated by a beam with periodic heat flux is investigated. The knowledge of radiation transport and temperature response in foam struts can provide fundamental information for understanding the pore-level heat transfer and for developing high-quality simulation and experiments.

建模耐火陶瓷泡沫在高温下的热传递的关键挑战是正确表征热辐射的传输特性，尤其是当泡沫直接暴露于高辐照光束（如集中的太阳辐射）时。单个撑杆中辐射传输的表征是泡沫辐射传递建模的代表和基础。这项研究数值研究了在高辐照光束下真实泡沫支撑中的辐射传输和温度响应。通过X射线微计算机断层扫描成像测量获得数字化的支撑杆，然后将其网格化在支撑杆体积内和表面上。离散标准法用于求解辐射传递方程，因为撑杆材料（氧化铝陶瓷）本质上对于入射辐射是半透明的，导致在固相内部吸收，散射和发射。跟踪辐射强度的体积传播并记录吸收的辐射能量。此外，还研究了具有周期性热通量的光束辐照支杆的温度响应。泡沫支柱中的辐射传输和温度响应的知识可以为了解孔隙水平的热传递以及开展高质量的模拟和实验提供基础信息。研究了具有周期性热通量的光束辐照支杆的温度响应。泡沫支柱中的辐射传输和温度响应的知识可以为了解孔隙水平的热传递以及开展高质量的模拟和实验提供基础信息。研究了具有周期性热通量的光束辐照支杆的温度响应。泡沫支柱中的辐射传输和温度响应的知识可以为了解孔隙水平的热传递以及开展高质量的模拟和实验提供基础信息。