凸台板式换热器流动沸腾的数值研究  

Numerical Study on Flow Boiling in Convex Plate Heat Exchangers

作　　者：陈晨 虞斌[1] 凌卫平 方玮玮 Chen Chen;Yu Bin;Ling Weiping;Fang Weiwei(College of Mechanical and Power Engineer,Nanjing Tech University,Nanjing,211816)

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《制冷与空调（四川）》2024年第3期285-292,共8页Refrigeration and Air Conditioning

摘　　要：使用Fluent仿真软件对凸台板式换热器水侧的流动沸腾换热机理进行了数值模拟研究。结果表明:流动沸腾换热伴随着汽泡的生成、长大、合并和破裂等过程,沸腾换热系数随着入口流速的增加而增大,最佳流速为0.125m/s。相对于最低流速,沸腾换热系数提高了96.6%-102.3%。但是,随着流速的增加,含气率明显降低。如果想要得到更多蒸汽,需要降低流速,并考虑凸台板式换热器末端干涸现象,以防止传热恶化。在凸台板片的凸台间距为18mm时,流动沸腾换热系数最佳。This article uses fluent simulation software to numerically simulate the flow boiling heat transfer mechanism on the water side of a convex plate heat exchanger.The research shows that flow boiling heat transfer is accompanied by the formation,growth,merging,and rupture of steam bubbles;The boiling heat transfer coefficient increases with the increase of inlet flow rate,with the optimal flow rate of 0.125m/s,which is 96.6%-102.3%higher than the minimum flow rate.However,with the increase of flow rate,the gas content has significantly decreased.To obtain more steam,it is necessary to reduce the flow rate,and also consider the drying phenomenon at the end of the convex plate heat exchanger to prevent heat transfer deterioration;When the distance between convex plates is 18mm,the flow boiling heat transfer coefficient is the best.

关 键 词：凸台板式换热器 流动沸腾 数值模拟 

分 类 号：TK175[动力工程及工程热物理—热能工程]