Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (11): 110602-110602.doi: 10.11889/j.0253-3219.2018.hjs.41.110602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study on the bubble movement and breakup of Venture-type bubble generator in throat and expansion section

MA Zhaowei1,2, LI Hua1, LIU Wei1, LIU Guimin1, ZHANG Qin1,2, YANG Guo1,2, WEI Fei1,2   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-08-21 Revised:2018-09-16 Online:2018-11-10 Published:2018-11-20
  • Supported by:
    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA0202000)

Abstract: [Background] The Venturi-type bubble generator is adopted in molten salt reactor degassing system because of its advantages of simple structure and effective production of micro-sized bubbles.[Purpose] This study aims to investigate the motion and breakup characteristics of bubbles in the throat and expansion section of Venturi-type bubble generator.[Methods] Based on the experimental water loop, high speed camera was employed to measure the movement of bubbles. The velocity distribution of bubbles in the throat and expansion section were analyzed, and compared with water velocity distribution without gas inlet.[Results] Bubble motion was divided into four stages:high-speed stable motion stage; rapid change stage; stable fluctuation stage; low-speed steady motion stage. With the increase of the gas inlet diameter, the fragmentation rate of the bubble decreases, and the stability of the bubble increases in the above four stages. As the water flow increases, the areas in the second and third stages will shrink to near x=0 mm.[Conclusion] The fragmentation of bubbles is related to the distribution of bubbles in the throat and expansion section of Venture-type bubble generator. The higher the velocity of the bubble changes, the greater the degree of fragmentation of the bubble, and the breakup process of bubbles occurs mainly in the second stage.

Key words: Bubble generator, Bubble motion, Velocity distribution, Bubble breakup

CLC Number: 

  • TL334