Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
Under the long-term storge of wet radioactive waste materials, hydrogen(H2) is generated by radiolysis of water, and the reduction of the risk of explosion and combustion plays an important role. Since water vapor condenses on the walls of storage vessel, the behavior of H2 is mainly in H2-air-steam (water vapor) atmosphere inside of storage vessel. Therefore, it is important to understand the condensation process of water vapor accurately and grasp the change of H2 concentration. In this study, CFD simulation method for estimating the amount of condensation of water vapor based on the heat-mass transfer analogy was used when the introduced gas was set to helium (He). An evaluation based on the comparison between the analytical results and the experimental values was carried out. As a result, it was found that the reproducibility of the experimental results was improved by using the condensation model considering the simple liquid film behavior.
