Numerical Investigation of Effect of Heat Transfer Model on Hydrogen Flow in Local Compartment

During the severe accident process,the hydrogen and the steam are released into the containment and transferred to other local compartments through narrow pipes.Heat transfer between gas mixture and wall has influence on hydrogen distribution.In this paper,CFD method is adopted to build the analysis model for local compartment connected by vertical flow path in the containment.The effect of Von Karman model,Reynolds model,and directly similar v-t profile model based on analogy theory on pressure,condensation heat,hydrogen and steam distribution are discussed.The result shows that the steam condensation mass and the hydrogen flow behavior simulated by Von Karman model and Reynolds model is consistent.The condensation mass obtained by directly similar v-t profile model is higher.Most steam condensed on the top wall of the source compartment,on this wall,directly similar v-t profile model predicts more condensation than other two models,which results in lower gas temperature.Hydrogen transferring into the upper compartment driven by buoyancy is also weaker.The hydrogen concentration in this compartment is lower.