Abstract Liquid salts have become more attractive as coolants for low-carbon power generation due to needs for high-temperature heat and affordable energy storage. Of particular interest are halide salts utilized in fluoride-salt-cooled high-temperature reactors, molten salt reactors, and high-magnetic-field fusion machines, as well as in concentrated solar power systems. Because of their high-temperature operation and semitransparent nature, the liquid salts in these designs may experience the effects of participating media radiative heat transfer (RHT). While some work has been conducted on measuring the thermophysical properties of these fluids, there is currently very little known about their radiative properties. Here, we present the initial results of a two-part methodology to enhance RHT understanding and improve modeling in high-temperature liquid salts. First, an experimental apparatus designed to measure liquid chloride and fluoride salt absorption coefficients by Fourier transform infrared spectroscopy was completed and validated with water measurements. Second, computational fluid dynamics (CFD) simulations were run to determine the contribution of thermal radiation to the overall heat transfer for flow between parallel plates. This geometry was used to verify code accuracy and investigate requirements for absorption coefficient spectral banding. Future work will be to complete halide salt absorption measurements and couple them to the established CFD methods to identify geometries and temperatures where RHT is significant and enable prediction of heat transfer in such systems.

中文翻译：

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推进高温液态盐的辐射传热建模

摘要 由于需要高温热量和经济实惠的储能，液态盐作为低碳发电的冷却剂变得更具吸引力。特别令人感兴趣的是在氟化物盐冷却高温反应堆、熔盐反应堆和高磁场聚变机以及聚光太阳能发电系统中使用的卤化物盐。由于它们的高温操作和半透明性质，这些设计中的液态盐可能会受到参与介质辐射传热 (RHT) 的影响。虽然已经在测量这些流体的热物理特性方面进行了一些工作，但目前对它们的辐射特性知之甚少。这里，我们展示了两部分方法的初步结果，以增强对高温液态盐的 RHT 理解和改进建模。首先，完成了设计用于通过傅立叶变换红外光谱测量液态氯化物和氟化物盐吸收系数的实验装置，并通过水测量进行验证。其次，运行计算流体动力学 (CFD) 模拟以确定热辐射对平行板之间流动的整体热传递的贡献。该几何结构用于验证代码准确性并研究对吸收系数光谱带的要求。