Effect of non-condensable gases on steam condensation in a vertical pipe with forced convection
MA Xizhen, JIA Haijun, LIU Yang
Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Abstract：Non-condensable gases have an important influence on steam condensation by increasing the thermal resistance during condensation and decreasing the heat transfer coefficient. A heat and mass analogy model based on the Nusselt's theory is developed for steam condensation in a vertical pipe with forced convection. The predicted effects of the non-condensable gases on the condensation are with agreement with experimental data. The heat transfer coefficient in the inlet varies from 4.8 kW/(m2·K) to 1.2 kW/(m2·K) for inlet air mass fractions from 8.73% to 22.45%. The heat transfer coefficient then decreases along the pipe. Increasing the inlet temperature from 100 ℃ to 140 ℃ reduces the inlet heat transfer coefficient. The research shows that the inlet temperature and the kind and the mass fraction of non-condensable gas are the important factors governing steam condensation rate.
马喜振, 贾海军, 刘洋. 竖直管道内强迫循环下非凝性气体对蒸汽冷凝的影响[J]. 清华大学学报（自然科学版）, 2017, 57(5): 530-536.
MA Xizhen, JIA Haijun, LIU Yang. Effect of non-condensable gases on steam condensation in a vertical pipe with forced convection. Journal of Tsinghua University(Science and Technology), 2017, 57(5): 530-536.
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