In order to develop a heat transfer enhancement technique for molten salt heat exchanger, Fluent simulation is carried out to investigate the molten salt flow and heat transfer performances in annular channels with wire coil. Two experimental set-ups were built to measure the temperature distribution of the test section, and the maximum relative deviation between the simulated temperature and experimental one is 3.27%. The effects of the wire width and helical pitch on heat transfer and flow characteristics, and the mechanism of heat transfer enhancement in wire coil inserted annular channels are discussed in the light of numerical results. It is found that adding coiled wire inserts in an annular channel can enhance the heat transfer performance by up to eight times as compared to a smooth annular channel, at a cost of higher flow resistance. The thermal performance factor is evaluated, which is greater than 3.7 at a constant pumping power. Finally, the heat transfer and friction factor correlations for annular channels with wire coil are proposed.

为了开发熔盐换热器的强化传热技术，Fluent 模拟研究了带线圈的环形通道中的熔盐流动和传热性能。建立了两个实验装置来测量测试段的温度分布，模拟温度与实验一的最大相对偏差为3.27%。根据数值结果讨论了线材宽度和螺距对传热和流动特性的影响，以及线材插入环形通道中的传热增强机制。研究发现，与光滑的环形通道相比，在环形通道中添加盘绕线插入件可以将传热性能提高多达八倍，但以更高的流动阻力为代价。热性能系数经过评估，在恒定泵送功率下大于 3.7。最后，提出了带线圈的环形通道的传热和摩擦系数相关性。