Student Posters Repository

Kawasaki Heavy Industries, Ltd. (KHI) established a CO₂free Hydrogen Energy Supply Chain project which aims to introduce a large amount of liquefied hydrogen (LH2) from Australia to Japan. In this project, it will be necessary to reduce the pressure in the tank to 1 atmosphere for the safety reason. The purpose of this research is to predict the pressure reduction rate through a thermodynamic approach and to investigate liquid behavior by numerical simulation. The theoretical results agreed with the experimental results, and this proved that the theoretical model was able to predict the pressure reduction rate. To reveal the influence of heat conductivity / transfer and liquid behavior, numerical simulations were conducted with the in-house code, called 'CIP-LSM' (CIP based Level Set & MARS). As a preliminary study, one case of rapid pressure reduction situation was calculated. As a result, it is found that the boiling gas pushed up the liquid level, because of the slow rising speed of bubble.