摘要
针对纯蒸汽在倾斜管内冷凝换热研究的不足,本文研究了质量含气率、倾角和质量流速对纯蒸汽在倾斜光滑管内冷凝过程中换热特性的影响。实验中蒸汽在内径为25 mm、长1050 mm的倾斜管内向下流动,与水平方向呈0°~30°,压力为0.1~0.3 MPa,质量流速为10~25 kg/(m^(2)·s)。结果表明:本实验低质量流速下,流型处于分层流,重力占主导地位,在相同流型下,局部换热系数随蒸汽质量含气率的降低而降低;质量流速的升高会减弱倾角对换热系数的影响;倾斜角度对平均换热系数的提高呈非单调性变化;同时通过对比以往的水平管内换热关系式,其中Chato的换热关系式基本偏差在±30%,并提出了基于实验数据的经验关系式,计算值与实验数据比较偏差在±20%以内。
Aiming at the shortcomings in the research on the heat transfer of pure steam condensing in an inclined tube,we examined the influence of the mass void fraction,inclination angle,and mass flux on the heat transfer characteristics of pure steam in the condensation process of an inclined smooth tube.In the experiment,steam flows downward in an inclined tube with an inner diameter of 25 mm and a length of 1050 mm,with an angle of 0°~30°in the horizontal direction,a pressure of 0.1~0.3 MPa,and mass flux of 10~25 kg/(m^(2)·s).The results show that under the experimental condition,the flow pattern was stratified flow at a low mass flux,and gravity was dominant.Under the same flow pattern,the local heat transfer coefficient decreases with the decrease in the steam quality,the mass flux increase would weaken the influence of the inclination angle on the heat transfer coefficient,and the inclination angle had a non-monotonic change in the improvement of the total heat transfer coefficient.At the same time,by comparing the previous heat transfer equations in the horizontal tube,the basic deviation of the heat transfer equation of Chato was±30%.An empirical relationship based on the experimental data was put forward.The calculated value was compared with the experimental data,proving that the deviation was within±20%.
作者
杨培勋
曹夏昕
刘佳宝
姜博洋
YANG Peixun;CAO Xiaxin;LIU Jiabao;JIANG Boyang(Heilongjiang Provincial Key Laboratory of Nuclear Power System and Equipment,Harbin Engineering University,Harbin 150001,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2022年第7期986-992,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(11975085)。
关键词
倾斜管
冷凝换热
纯蒸汽
低质量流速
实验研究
经验关系式
非单调性
两相流型
inclined tube
condensation heat transfer
pure steam
low mass flux
experimental study
correlation relationship
non-monotonicity
two-phase flow pattern
