水平管内乙烷饱和流动冷凝传热实验  

Experimental investigation on flow condensation heat transfer of ethane in a horizontal tube

作　　者：庄晓如[1,2] 公茂琼[1] 邹鑫[1] 陈高飞[1] 吴剑峰[1] ZHUANG XiaoRu GONG MaoQiong ZOU Xin CHEN GaoFei WU JianFeng(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院理化技术研究所,中国科学院低温工程学重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《科学通报》2017年第4期320-327,共8页Chinese Science Bulletin

基　　金：国家自然科学基金(51506210)资助

摘　　要：开展了乙烷在内径为4 mm的水平管内饱和流动冷凝传热特性的实验研究.实验测量的压力范围为1.01~2.56 MPa,质量流率范围为100~257 kg/(m^2s),干度范围为0~0.8.分析了质量流率、干度和饱和压力对饱和流动冷凝传热系数的影响,结果表明在较高质量流率和干度下,传热系数随着质量流率和干度的增大而增大,随着饱和压力的增大而减小;在低干度和质量流率下,干度、质量流率和饱和压力对传热系数的影响均较小.另外,还将实验数据与9种常用的饱和流动冷凝传热关联式进行对比,发现Chato和Wang等人的模型关联式对实验数据预测较好,平均偏差均在35%以内.In recent years, due to the environmental problems of traditional chlorinated refrigerants, it has become an urgent task to search for suitable substitutes. Hydrocarbons, with zero ozone depleting potential, low global warming potential and high thermodynamic performance, are good alternative refrigerants in refrigerators and heat pump systems. In addition, hydrocarbons also the important parts of the natural gas. As one kind of hydrocarbons, ethane and its mixtures have been widely applied in the mixed refrigerant throttling refrigeration systems and recommended to be used in the cascade refrigeration systems to replace R13 and R503. As the heat transfer characteristics of ethane play important parts in the design of the heat exchangers in refrigeration cycles, the heat transfer coefficients during condensation should be well examined and analyzed. Although there are massive experimental studies of heat transfer on flow condensation of hydrocarbons in horizontal tubes, the published experimental investigations for ethane are rare. Therefore, it＇s desirable to conduct an experimental investigation on condensation heat transfer of ethane in a horizontal tube and find suitable correlations. In this paper, condensation heat transfer of ethane was studied experimentally in a horizontal tube with inner diameter of 4 mm. The heat transfer test section was a copper plate（100 mm× 20 mm× 200 mm） embedded twelve four-wire PT100 platinum resistance thermometers. Using the assumption of two-dimensional heat conduction for the copper plate, both the wall temperature and heat flux could be obtained. The tests were carried out at saturation pressures from 1.01 MPa to 2.56 MPa for mass fluxes from 100 kg/（m^2s） to 257 kg/（m^2s） and vapor qualities from 0 to 0.8. The uncertainties for the heat transfer coefficient with a 95% confidence interval were less than 3.33% under the employed operation conditions. The effects of mass flux, vapor quality and saturation pressure on condensation heat transfer coefficient were

关 键 词：流动冷凝 乙烷 传热系数 传热关联式 水平管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]