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Wenxuan Xi,Yongwei Wang,Xunfeng Li,Xiulan Huai,Jun Cai 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.5
The heat transfer characteristics between liquid lead bismuth eutectic (LBE) and helium are of great significance for the two-loop cooling system based on an accelerator-driven system(ADS). This paper presents an experimental study on the resistance characteristics and heat transfer performance in a LBE-helium experimental loop of ADS. Pressure drops in the LBE loop, the main heat transfer, and the coupled heat transfer characteristics between LBE and helium are investigated experimentally. The temperature of LBE has a significant effect on the LBE thermo-physical properties, and is therefore considered in the prediction of pressure drops. The results show that the overall heat transfer coefficient increases with the increasing helium flow rate and the decreasing inlet temperature of helium. Increasing the LBE Reynolds number and LBE inlet temperature promotes the heat transfer performance of main heat transfer and thus the overall heat transfer coefficient. The experimental results give an insight into the flow and heat transfer properties in a LBE-helium heat exchanger and are helpful for the optimization of an ADS system design.
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First principles calculation of boron diffusion in fcc-Fe
Xin Zhang,Xianglong Li,Ping Wu,Sen Chen,Shiping Zhang,Ning Chen,Xiulan Huai 한국물리학회 2018 Current Applied Physics Vol.18 No.10
The diffusion mechanism of boron in fcc-Fe was studied by first-principles calculations. The sites where B atoms tend to occupy and the diffusion behavior were calculated. Results indicated that the main mechanism of boron diffusion in fcc-Fe was the B–monovacancy complex mechanism instead of the interstitial mechanism. The diffusion coefficient D1 of the B–monovacancy complex mechanism was calculated without considering the backward jump of the B atoms. The calculated D1=1.26×10−4×exp(–2.01eV/kBT) m2·s−1 is consistent with the reported results from experiments.
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