Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (8): 80604-080604.doi: 10.11889/j.0253-3219.2016.hjs.39.080604

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

CFD-simulation of structured packed beds molten salt reactors on pressure drop and heat transfer

PAN Deng1,2, YU Xiaohan1, ZOU Yang1, E Yanzhi1,2, XU Bo1,2, ZHOU Zhenhua1,2, HE Jie1,2   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-03-03 Revised:2016-04-08 Online:2016-08-10 Published:2016-08-15
  • About author:PAN Deng, male, born in 1989, graduated from Harbin Engineering University in 2013, master student, focusing on thermal-hydraulics of the pebble bed-molten salt reactor
  • Supported by:

    Supported by Strategic Pilot Science and Technology Project of Chinese Academy of Sciences (No.XDA02001002)

Abstract:

Background: The computational fluid dynamics (CFD) simulation of thermal-hydraulic characters is essential to ensure the safety in designing and operating a nuclear reactor. To obtain reliable results, a suitable model must be chosen. For the pebble bed reactors, the complex geometries of the core make it difficult to establish a precise model for CFD simulation, especially for the molten salt reactor (MSR)-one of the most hopeful GIV nuclear power system. Purpose: This study is aimed to valid the porous media model used in pebble beds thermal-hydraulic simulation, including the Pressure-Drop formula and the Convection-Heat-Transfer formula. Methods: The fluent model of an orderly-arranged pebble bed was built, and the SST-turbulence model was chosen to simulate the molten salt flow inside the bed. Results: In a large range of fluid Reynolds numbers, the linear pressure drop of the flow was obtained, and also was the Nusselt numbers for convection heat transfer between sphere surface and the salt fluid. Conclusions: The data was fitted to format new formulas. For the pressure drop, simulation result much differs in both of the KTA (Kerntechnischer Ausschuss)-formula and the Ergun-equation. However, the Nusselt number from simulation is more close to the KTA-formula and the Wakao-formula. Modification of the traditional formulas is needed obviously, and new formulas fitted from KTA-formula is much more close to the simulation results, both for the linear pressure drop and the Nusselt number.

Key words: Pebble bed reactor, MSR, CFD simulation, Porous media model

CLC Number: 

  • TL334