Abstract:
A small amount of non-condensable gas in the steam causes the condensation heat transfer decline greatly. The existing models on non-condensable gas condensation heat transfer could not predict the test well in high pressure, because the gas is compressed under high pressure conditions while the models based on the ideal gas state equation have not considered the pressure effect. To provide technical analysis assistant for integrated reactor safety, a new model was established for predicting the condensation of non-condensable gases under high pressure. Based on the real gas equation and the diffusion layer theory, the new model considered the film waviness effect, suction effect and atomization effect. The Kim’s test database was employed to validate the model, and the results show that the improved model has a smaller deviation band than the model based on the ideal gas. The relative deviation is mostly within ±25%, which fully reflects the applicable value of the model under high pressure conditions.