Forced convection and entropy generation from elliptic tubes with longitudinal fins
Forced convection and entropy generation from elliptic tubes with longitudinal fins
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DOI：
10.1016/j.enconman.2009.04.021
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发表时间：
2009-08
影响因子：
10.4
通讯作者：
E. Ibrahim;M. Moawed
中科院分区：
文献类型：
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作者：
E. Ibrahim;M. Moawed
通过实验研究了带纵翅片的椭圆管的传热特性和熵的产生。所研究的几何参数包括翅片在管的前部、管的后部以及管的前部和后部的位置。对不同情况下分别安装在方形隧道内的电热椭圆管进行了实验。测量了不同情况下椭圆管的表面温度。测试流体为空气，雷诺数范围约为4.75×103to 3.96×104。熵产分析是基于总熵产率最小的原则进行的，其中包括传热和摩擦力产生的熵产。结果表明，翅片在椭圆管上的位置对换热系数、摩擦系数和不可逆性比的计算结果有影响。给出了平均努塞尔数、摩擦系数和不可逆性比与Re的相关关系。
An experimental investigation has been conducted to clarify heat transfer characteristics and entropy generation for individual elliptic tubes with longitudinal fins. The investigated geometrical parameters included the placement of the fins at the front of the tube, at the rear of the tube and at the front and rear of the tube. The experiments have been carried out on the different cases of electrically heated elliptic tubes which are separately installed in a square tunnel. The surface temperature at different cases of elliptic tubes, have been measured. The testing fluid was air and the Reynolds number ranged from about 4.75×103to 3.96×104. The analysis of the entropy generation is based on the principle of minimizing the rate of total entropy generation that includes the generation of entropy due to heat transfer and friction forces are presented. The results indicate that the fin position on the elliptic tube has an effect on the results of heat transfer coefficient, friction factor and irreversibility ratio. The correlations of average Nusselt number, friction factor and irreversibility ratio with Re are presented.