Heat transfer and pressure drop correlations for the wavy fin and flat tube heat exchangers
Heat transfer and pressure drop correlations for the wavy fin and flat tube heat exchangers
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DOI：
10.1016/j.applthermaleng.2006.11.012
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发表时间：
2007-08
影响因子：
6.4
通讯作者：
Dong Junqi;Jiangpin Chen;Zhi-jiu Chen;Zhou Yimin;Wenfeng Zhang
中科院分区：
文献类型：
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作者：
Dong Junqi;Jiangpin Chen;Zhi-jiu Chen;Zhou Yimin;Wenfeng Zhang
对11台波纹翅片扁管叉流换热器进行了实验研究。在空气侧雷诺数为800-6500的范围内，以2.5m3/h的管程水流量为条件，对不同的翅片间距、长度和高度进行了一系列试验。采用有效性-NTU法对空气侧热性能数据进行了分析。采用科尔本j因子和范宁摩擦因子f作为Re的函数，研究了不同几何参数下的换热和压降特性。考察了翅片间距、翅片高度和翅片长度对换热和压降性能的影响。通过多元线性回归分析和F检验，得出j和f因子的一般相关。j和f因子的相关性可以预测95%的实验数据，误差在± 10%以内。
A total of 11 cross-flow heat exchangers having wavy fin and flat tube were studied experimentally. A series of tests were conducted for air side Reynolds number in the range of 800–6500 with different fin pitches, fin lengths and fin heights, at a constant tube-side water flow rate of 2.5m3/h. The air side thermal performance data were analyzed using the effectiveness-NTU method. The characteristics of heat transfer and pressure drop for different geometry parameters were reported in terms of Colburn j-factor and Fanning friction factor f, as a function of Re. The effects of fin pitch, fin height and fin length on the performance of heat transfer and pressure drop were examined. The general correlations for j and f factors were derived by multiple linear regression analysis and F test of significance. The correlations for j and f factors can predict 95% of the experimental data within ±10%.