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Volume 46 Issue S1
Jul.  2025
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Zhu Zhizhou, Tong Lili, Cao Xuewu. Study on Modified Diffusion Layer Wall Condensation Model Considering Suction Effect[J]. Nuclear Power Engineering, 2025, 46(S1): 95-102. doi: 10.13832/j.jnpe.2025.S1.0095
Citation: Zhu Zhizhou, Tong Lili, Cao Xuewu. Study on Modified Diffusion Layer Wall Condensation Model Considering Suction Effect[J]. Nuclear Power Engineering, 2025, 46(S1): 95-102. doi: 10.13832/j.jnpe.2025.S1.0095

Study on Modified Diffusion Layer Wall Condensation Model Considering Suction Effect

doi: 10.13832/j.jnpe.2025.S1.0095
  • Received Date: 2024-08-15
  • Rev Recd Date: 2025-04-15
  • Publish Date: 2025-07-09
  • Steam wall condensation is an important passive heat removal method under loss of coolant accident (LOCA). The accuracy of the wall condensation model directly affects the validity of the analysis results. Based on the computational fluid dynamics (CFD) code, a diffusion layer wall condensation model was constructed in this paper. The JERICHO experiment was selected to evaluate the model. The results show that the diffusion layer wall condensation model can accurately predict the steam wall condensation rate at low condensation rate conditions. However, the model underestimates the wall condensation rate as the steam condensation rate increases. To address this problem, the suction effect and the non-uniformity distribution of the mixed gas density along the wall-normal direction are considered. A correction relationship for the suction effect considering the influence of light gas is proposed, the condensation source term is modified, and a new diffusion layer wall condensation model is constructed. The prediction results of the modified model are verified based on the COPAIN experiment. The simulated heat flux density is in good agreement with the experimental data, and the relative error is within ±15%, which proves the accuracy of the modified diffusion layer wall condensation model.

     

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