R290/R134a在水平微肋管中沸腾传热的数值模拟  

Numerical simulation of boiling heat transfer of R290/R134a in horizontal micro-ribbed tubes

作　　者：张虎 鲁祥友 刘晨晨 谢远来[2] 夏永放 Zhang Hu;Lu Xiangyou;Liu Chenchen;Xie Yuanlai;Xia Yongfang(School of Environmental and Energy Engineering,Anhui Jianzhu University,Hefei 230601,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]安徽建筑大学环境与能源工程学院,合肥230601 [2]中国科学院合肥物质科学研究院,合肥230031

出　　处：《低温与超导》2022年第4期31-38,共8页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51606002);安徽省高校省级自然科学研究项目(KJ2019A0755);安徽建筑大学自然科学研究项目(JY16-3-184)资助。

摘　　要：为探究混合制冷剂R290/R134a(4/6)在水平微肋管中的沸腾传热特性,采用了CFD软件数值模拟的方法,对混合制冷剂R290/R134a(4/6)分别在外径为7 mm,长为500 mm的水平光滑管和微肋管中进行数值模拟与理论分析。分析了质量流量、热流密度,以及干度对混合制冷剂在水平微肋管中换热特性的影响。结果表明:两种管型的沸腾换热系数随质量流量、热流密度和干度的增大出现先增大后减小的趋势;热流密度对制冷剂沸腾换热系数的影响最大,在质量流量保持不变,改变热流密度的条件下,微肋管最大传热系数分别为光滑管的1.30、1.31、1.26倍;质量流量的增加提高了制冷剂的临界干度,光滑管与微肋管最大临界干度分别为0.57、0.63。In order to explore the boiling heat transfer characteristics of mixed refrigerant R290/R134 a(4/6) in horizontal micro-fin tubes, numerical simulation and theoretical analysis of mixed refrigerant R290/R134 a(4/6) in horizontal smooth tubes with an outer diameter of 7 mm and a length of 500 mm were carried out using CFD software. The effects of mass flux, heat flux density and dryness on the heat transfer characteristics of mixed refrigerant in horizontal micro-fin tube were analyzed. The results show that the boiling heat transfer coefficient of the two tubes increases first and then decreases with the increase of mass flow rate, heat flow density and dryness. The heat flux has the greatest influence on the heat transfer coefficient of refrigerant boiling. Under the condition of constant mass flow rate and changing heat flux, the maximum heat transfer coefficient of micro-fin tube is 1.30, 1.31 and 1.26 times of that of smooth tube, respectively. The rise of mass flow increases the critical dryness of the refrigerant, and the maximum critical dryness of smooth tube and micro-fin tube is 0.57 and 0.63.

关 键 词：R290/R134a 强化换热 微肋管 有数值模拟 

分 类 号：TB612[一般工业技术—制冷工程]