Theoretical study on the critical heat and mass transfer characteristics of a frosting tube

Theoretical study on the critical heat and mass transfer characteristics of a frosting tube
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结霜管临界传热传质特性的理论研究

DOI:
10.1016/j.applthermaleng.2013.01.040
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发表时间:
2013-05
影响因子:
6.4
通讯作者:
J.H. Zhu
J.H. Zhu
中科院分区:
工程技术2区
文献类型:
--
作者:
Y.C. Feng;W.P. Lu;X.G. Dong;J.H. Zhu

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进行了理论研究,以研究结霜管上的临界传热和传质特性。首次提出了临界霜厚度(CFT)和中性霜厚度(NFT)参数。发现传热在 CFT 点之前增加,并在 NFT 点减少到非结霜管的初始值。研究结果为翅片管热交换器在结霜早期阶段的传热增加提供了合理的解释。通过理论研究,CFT和NFT的值受到以下五个参数的影响:空气温度Ta、湿度φ、速度V、管壁温度Twan和管外径d2。进一步讨论了这些参数对CFT和NFT的影响。通过敏感性分析,发现CFT和NFT对φ、V和d2参数更加敏感。
A theoretical study was conducted to investigate the critical heat and mass transfer characteristics on a frosting tube. The parameters, Critical Frost Thickness (CFT) and Neutral Frost Thickness (NFT) were presented for the first time. The heat transfer was found to increase before the point CFT, and decrease to the initial value of a non-frosted tube at the point NFT. The findings provide a reasonable explanation for the heat transfer increase for a fin-tube heat exchanger at the early stages of frost formation. By theoretical study, the values of CFT and NFT were impacted by the following five parameters, the air temperature Ta, humidity φ, velocity V, tube wall temperature Twand tube outside diameter d2. The influences of these parameters on the CFT and NFT were further discussed. By sensitivity analysis, the CFT and NFT were found to be more sensitive to the parameters of φ, V and d2.
DOI: 10.1080/14786441008636929
发表时间: 1910-09
期刊: Philosophical Magazine Series 1
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