Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (2): 28 doi: 10.1007/s41365-019-0556-8

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study of heat transfer by using DEM-CFD method in a randomly packed pebble bed reactor

Qiang Niu1,2,3 • Na-Xiu Wang1,2,3   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 CAS Innovative Academies in TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
    3 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-06-01 Revised:2018-09-03 Accepted:2018-09-06
  • Contact: Na-Xiu Wang
  • Supported by:
    This work was supported by the Chinese TMSR Strategic Pioneer Science and Technology Project (No. XDA02010000) and the Frontier Science Key Program of the Chinese Academy of Sciences (No. QYZDY-SSW-JSC016).
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Qiang Niu, Na-Xiu Wang. Study of heat transfer by using DEM-CFD method in a randomly packed pebble bed reactor.Nuclear Science and Techniques, 2019, 30(2): 28     doi: 10.1007/s41365-019-0556-8

Abstract: The pebble-bed reactor is one of the most promising designs for the nuclear energy industry. In this paper, a discrete element method–computational fluid dynamics (DEM–CFD) approach that includes thermal conduction, radiation, and natural convection mechanisms was proposed to simulate the thermal-fluid phenomena after the failure of forced circulation cooling system in a pebble-bed core. The whole large-scale packed bed was created using the DEM technique, and the calculated radial porosity of the bed was validated with empirical correlations reported by researchers. To reduce computational costs, a segment of the bed was extracted, which served as a good representative of the large-scale packed bed for CFD calculation. The temperature distributions simulated with two different fluids in this DEM–CFD approach were in good agreement with SANA experimental data. The influence of the natural convection mechanism on heat transfer must be taken into account for coolants with strong convective capacity. The proposed DEM–CFD methodology offers a computationally efficient and widely applied method for understanding the heat transfer process in a pebble-bed core. The method can also be easily extended to assess the passive safety features of newly designed fluoride- salt-cooled pebble-bed reactors.

Key words: Discrete element method, Computational fluid dynamics, Pebble bed, Heat transfer, Natural convection