Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (10): 100601-100601.doi: 10.11889/j.0253-3219.2018.hjs.41.100601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Numerical simulation study on heat transfer characteristics of new heat exchange fins

MIAO Hongkang1,2, CHEN Yushuang1,3, LYU Liushuai1,3, WANG Naxiu1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2 Shanghai Institute of Satellite Engineering, Shanghai 201109, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-06-04 Revised:2018-07-30 Online:2018-10-10 Published:2018-10-16
  • Supported by:
    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA0201002), National Natural Science Foundation of China (No.91326201)

Abstract: [Background] The molten-salt heat exchanger is an important part of thorium molten salt reactor with liquid fuel (TMSR-LF1) integrated simulation platform, and its thermohydraulic performace is critical to the safety in operation. Furthermore, there are many problems in traditional shell and tube heat exchangers. It is very important to develop new heat exchanger.[Purpose] This study aims to redesign heat exchange fins to improve the compactness and thermohydraulic performance of molten salt heat exchanger by numerical simulation.[Methods] Simulation software FLUENT was employed to design and improve different fin types, and the numerical results of each type were compared and analyzed from three aspects:pressure drop, heat transfer coefficient and comprehensive performance index. The numerical simulation under the condition of water is carried out, and the results are compared with those of molten salt.[Results] Compared with the traditional rectangular fins, the heat transfer coefficient of streamline fin in molten salt is increased from 3.6% to 6.7%, the comprehensive performance index is increased by 2% on average, the overall compactness is enhanced, and the heat transfer capacity is greatly improved at high velocity. The improved streamline fin has a minimum pressure drop of 6.2% and 12% lower than that of the rectangular fin and the streamline fin, respectively. The comprehensive performance index of each fin was greatly improved under the water condition, but the streamline fin was no longer superior to the traditional rectangular fin in the water phase.[Conclusion] It reflects the unique applicability of streamline fin type in molten salt medium.

Key words: Plate fin heat exchanger, Type design, Numerical simulation, Heat transfer performance evaluation

CLC Number: 

  • TK172