Numerical simulations on steam condensation heat transfer characteristics in the presence of air

被引：0
|
作者：
Bian H. [1 ]
Sun Z. [1 ]
Ding M. [1 ]
Zhang N. [1 ]
Memg Z. [1 ]
Wang L. [2 ]
机构：
[1] Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin
[2] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2019年 / 40卷 / 02期
关键词：
CFD simulation; Condensation model; Diffusion theory; Gas pressure; Gas velocity; Non-condensable gas; Wall sub-cooling;
D O I：
10.11990/jheu.201709070
中图分类号：
学科分类号：
摘要：
Numerical simulations are conducted to quantitatively evaluate the effects of gas velocity, wall sub-cooling, condensation wall height, and gas pressure on condensation heat transfer. The calculations are based on COPAIN experimental facility and diffusion theory-based condensation model incorporated in the CFD software STAR-CCM+. Condensation heat transfer property is evaluated in terms of velocity from 0.1 m/s to 3 m/s, wall sub-cooling from 4℃ to 50℃, condensation wall height from 0.5 to 6 m, and pressure from 0.1 MPa to 0.6 MPa. Results indicate that the condensation heat transfer coefficient is hardly affected by the mainstream gas velocity in the natural convection-dominated region with velocities less than 0.5 m/s. Furthermore, the power exponent of wall sub-cooling can be described by a function in terms of air mass fraction and wall sub-cooling, which ranges from -0.008 3 to -0.367. The condensation wall height has an obvious effect on the condensation heat transfer when it is less than 1 m, and the heat transfer coefficient has a 0.64 power direct proportion to the gas pressure. Via numerical results analysis, the quantitative relationship between the condensation heat tranfer porperty and the influencing parameters were concluded, which can to a certain degree promote the understanding of steam condensaiton phenomena in the presence of air. © 2019, Editorial Department of Journal of HEU. All right reserved.
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页码：426 / 432
页数：6
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