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Forced convection and entropy generation from elliptic tubes with longitudinal fins

机译：带有纵向鳍片的椭圆管的强制对流和熵产生

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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 × 10~3 to 3.96 × 10~4.rnThe 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.
机译：已经进行了一项实验研究，以弄清带有纵向散热片的单个椭圆管的传热特性和熵的产生。研究的几何参数包括翅片在管的前面，在管的后面以及在管的前面和后面的位置。实验是在分别安装在方形隧道中的电加热椭圆管的不同情况下进行的。已经测量了不同情况下的椭圆管的表面温度。测试流体是空气，雷诺数范围从大约4.75×10〜3到3.96×10〜4.rn。熵产生的分析基于最小化总熵产生率的原理，其中包括总熵的产生率。传热和摩擦力。结果表明，椭圆管上的翅片位置对传热系数，摩擦系数和不可逆比的结果有影响。给出了平均努塞尔数，摩擦系数和不可逆比与Re的关系。

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