Characteristics of the high-temperature water film evaporation with countercurrent turbulent air flow in the duct

Passive containment with high design pressure often has high evaporation temperature. The evaporation mass transfer with high evaporation temperature along with countercurrent turbulent airflow in a long duct was experimentally investigated. The experiments were performed for a wall surface temperature range of 71-90 degrees C. The experimental data showed that the high evaporation temperature significantly enhanced evaporation. By comparison, it reveals that the significant prediction deviation of the correlation from Kang and Park (Nuclear Engineering and Design, Vol. 204, pp 347-359, 2001) is mainly due to the cubic power modification. HMTA from Huang and Yang (Annals of Nuclear Energy, Vol. 76, pp 237-242, 2015) also underestimates the Sherwood number at high evaporation temperature but it could be applicable when the modification of the wavy interface and the advective mass transfer are included. A modified correlation for falling water film evaporation with high evaporation temperature is finally developed. (C) 2019 Elsevier Ltd. All rights reserved.