Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (3): 30601-030601.

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

### Numerical simulation of bubble separation trajectory in fission gas removal system

MA Yanfei, YIN Junlian, QIAN Yalan, WANG Dezhong

1. School of Mechanical Engineering, Shanghai Jiao Tong University, 200240, China
• Received:2016-11-30 Revised:2016-12-26 Online:2017-03-10 Published:2017-03-11
• Supported by:

Supported by Mechanism of Fission Gas Removal in High Temperature Molten Salt Medium (No.11535009), Evolution Mechanism of Gas Core Formation in Gas-Liquid Separator of Molten Salt (No.51400600534)

Abstract:

Background: One advantage of the liquid fueled Thorium Molten Salt Reactor (TMSR) is that the fuel can be burned up deeply with the neutron poisonous gas removal system that can be achieved by bubbling degassing approach. In order to quantify the separation efficiency for the separator and provide useful guidelines to determine the dimensions for the separator, the separation trajectories of bubbles with different sizes in the swirl flow inside the separator are needed. Purpose: This study aims to develop an alternative method to predict the bubble's motion which can avoid the troubleshooting induced by the two-phase simulation. Methods: The Lagrangian approach is modified to obtain the continuous phase velocity by a single phase simulation, and curve fitting is applied to further approximation of this velocity. Combing the known velocity distribution with explicit mathematical expression and the interaction model for the gas-liquid interface, a mathematical model to calculate the bubble motion is well posed. Results: A comparison between the numerical results and the experimental data indicates that the result agrees well with each other. As for the separation length concerned, the maximal error is less than 20%. Conclusion: It has theoretical guidance meaning for research on the movement of bubbles in cyclone separator. And it can be used to guide the determination of swirl chamber space.

CLC Number:

• TL942