| 李淑恒，李庆生，刘 博.LNG绕管式换热器管内压降和热传递的数值模拟[J].轻工机械,2016,34(2): |
| LNG绕管式换热器管内压降和热传递的数值模拟 |
| Numerical Simulation of Pressure Drop and Heat Transfer inside Tube of LNG Coil-Wound Heat Exchanger |
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| DOI：10. 3969/j. issn. 1005 -2895. 2016. 02. 004 |
| 中文关键词: 换热器 LNG绕管式换热器 甲烷 湍流 FLUENT软件 |
| 英文关键词:heat exchanger LNG coil-wound heat exchanger methane turbulent FLUENT software |
| 基金项目:江苏省自然科学基金“LNG用缠绕管式换热器设计”（NO．2014-ZB22-013） |
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| 中文摘要: |
| 针对目前LNG绕管式换热器在设计时存在管内低温传热的不确定性，采用FLUENT软件分析了大螺距螺旋管
在湍流状态下管内的压降和冷却传热特征。研究中分别采用4.8 MPa的气态甲烷和液态甲烷为介质，探讨了螺旋管结
构、雷诺数Re、普朗特数Pr对压降和努塞尔数Nu的影响。结果表明：管径、缠绕直径、Re及Pr对压降和/VM的影响较
大；螺距对传热和压降影响较小，可忽略不计。并将模拟值与Jayakumar等半经验值做对比，结果趋势一致。最后拟合出
适用于LNG低温冷却状态下的Nu公式，为LNG绕管式换热器的工艺计算提供一定的依据。 |
| 英文摘要: |
| In the view of the uncertainty of the low temperature heat transfer in the tube for the design of LNG coil-wound
heat exchanger, the pressure drop and heat transfer characteristics inside tube of large pitch's spiral under turbulent flow
were analyzed by FLUENT software. Caseous methane and liquid methane of 4. 8 MPa were used as the medium. and
the effects of spiral tube's structure. Re and Pr on the pressure drop and Nu were analyzed. The results show that the
effects of tube diameter. winding diameter. Re and Pr on the pressure drop and Nu are relatively larger, and the effect
of pitch on the pressure drop and Nu. is smaller which can be negligible. The simulation results were compared with the
results of Jayakumar etc. . and the trend had no difference. The Nu. formula suitable for LNG under cryogenic cooling
condition was proposed, and it provided the accordance with the technology calculaton of the LNG coil-wound heat
exchanger. |
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