Numerical simulation for subcooled boiling process of liquid nitrogen in vertical tube

Based on the current subcooled boiling phase transformation model,the important bubble model parameters about boiling process were amended according to the mechanism of boiling heat transfer.The partition of wall heat flux was studied and the new model applicable to subcooled boiling process of liquid nitrogen was reestablished.The subcooled boiling phase transformation of liquid nitrogen in a three-dimensional vertical tube was simulated through the application of the new model in commercial CFD code CFX4.4.The results shows that the evaporation heat flux is the main part of wall heat transfer and boiling heat transfer plays a leading role in the heat transfer process.The simulated results are in good agreement with the experimental data,which demonstrates the accuracy of the new model.