扭曲螺旋管内LNG的传热与流动特性研究  

Research on heat transfer and flow characteristics of LNG in twisted spiral tube

作　　者：王苡帆 王景甫[1,2] 张新欣[1,2] Wang Yifan;Wang Jingfu;Zhang Xinxin(MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Univ.of Tech.,Beijing 100124,China;Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing Univ.of Tech.,Beijing 100124,China)

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室,北京100124 [2]北京工业大学传热与能源利用北京市重点实验室,北京100124

出　　处：《低温与超导》2023年第1期1-7,14,共8页Cryogenics and Superconductivity

基　　金：国家自然科学基金(11005014201501)资助。

摘　　要：采用数值分析方法,分别对液化天然气(LNG)在扭曲椭圆管和扭曲扁管内发生相变时的传热和流动特性进行了研究,分析了管道长短轴之比和雷诺数对管道换热性能的影响。结果表明,扭曲管道内流体流动产生的二次流强化了管道的传热性能。扭曲椭圆管道的综合性能系数PEC值均大于1,其换热性能优于相同条件下的圆管;扭曲扁管的长短轴之比小于2时,在低雷诺数时的PEC值小于1,此时扭曲扁管的换热性能不如相同条件下的圆管。在管道长短轴之比相同时,相同条件下扭曲椭圆管的综合性能优于扭曲扁管。The heat transfer and flow characteristics of liquefied natural gas(LNG)during phase change in twisted elliptic tubes and twisted flat tubes were studied by numerical analysis.The effects of the ratio of major axis to minor axis and Reynolds number on the heat transfer performance of the tubes were analyzed.The results show that the secondary flow generated by the fluid flow in the twisted tube enhances the heat transfer performance of the tube.The comprehensive coefficient of performance(PEC)of the twisted elliptical tube is greater than 1,and its heat transfer performance is better than that of the round tube under the same conditions.When the ratio of long axis to short axis of twisted flat tube is less than 2,the PEC at low Reynolds number is less than 1,and the heat transfer performance of twisted flat tube is not as good as that of round tube under the same conditions.At the same ratio of long axis to short axis,the overall performance of twisted elliptical tube is better than that of twisted flat tube under the same conditions.

关 键 词：液化天然气 扭曲管道 换热性能 数值分析 

分 类 号：TK172[动力工程及工程热物理—热能工程]