Numerical simulation of non-isothermal multicomponent flow in fission product venting system

Numerical studies were conducted to simulate flow, temperature, and mixing in a low temperature low pressure transparent test facility of FPVS of GFR CL with Air as surrogate coolant and Argon as the surrogate fission product gas at atmospheric pressure. Non-isothermal, multicomponent flow simulation was performed using COMSOL. The preliminary results show that under given operating condition of laminar flow, fluid flow in the loop significantly affected to temperature distribution. The stratified Dean flow is clearly observed at curved parts (elbows) of the loop and temperature distribution follows it. However, diffusion effect is dominant on transport of species. Argon infused through the porous wall is diffuses overall prior to entering the curved region of the loop. This numerical simulation will help to choose optimum operating conditions and the geometry for the future experimental facilities by estimating how heat and component are mixed. The positions to measure the temperature and mass fraction during the experiment can be determined based on the numerical simulation.