Heat Transfer of Falling Liquid Film under Countercurrent Air Flow
Shi Jinsheng,Zhang Qiaozhen,Liu Zhenyi,Chen Dong
(Department of Fundamental Sciences, Tianjin University of Science & Technology, Tianjin,300222)

Abstract: Under the background of the passive containment cooling of the next generation nuclear power plant, this paper presents a simple analytical model for the heat transfer of a sub-cooled liquid film falling down the inside wall of a vertical tube under the counter-current air-vapor flow. In this analysis, the film is modeled by approximate boundary layer theory, while the air-vapor mixture is modeled by the empirical correlations resulted from the analogy between h eat and mass transfer. Along the flowing direction, the variation of film thickness, temperature, and the heat transfer by film heating and by film vaporization is explored. Comparison with others is made and the validity of this research is indicated.
Keywords: falling liquid film air-vapor mixture heat and mass transfer analogy heat transfer by film heating heat transfer by film vaporization.