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对高温导热油在螺纹管内流动和传热进行实验研究,结果表明:在层流区,螺纹管沿程阻力系数是相应光管的1.8~3.0倍,Nu数是相应光管的2.8~4.6倍.在湍流区,螺纹管沿程阻力系数是相应光管的3~4倍,Nu数是相应光管的1.8~3.8倍.应用FLUENT对螺纹管和光管进行三维数值模拟,结果表明在螺纹管流场的背流面存在回流区.与光管相比,螺纹管局部协同角的变化范围更大,且在凹槽左右的位置局部协同角接近90°,远离凹槽位置,局部协同角较光管有明显下降.

参考文献

[1] A. A. Rabienataj Darzi;Mousa Farhadi;Kurosh Sedighi;Rouzbeh Shafaghat;Kaveh Zabihi .Experimental investigation of turbulent heat transfer and flow characteristics of SiO_2/water nanofluid within helically corrugated tubes[J].International Communications in Heat and Mass Transfer: A Rapid Communications Journal,2012(9):1425-1434.
[2] A. A. Rabienataj Darzi;Mousa Farhadi;Kurosh Sedighi;Shahriar Aallahyari;Mojtaba Aghajani Delavar.Turbulent heat transfer of Al_2O_3-water nanofluid inside helically corrugated tubes: Numerical study[J].International Communications in Heat and Mass Transfer: A Rapid Communications Journal,2013:68-75.
[3] S. Pethkool;S. Eiamsa-ard;S. Kwankaomeng;P. Promvonge .Turbulent heat transfer enhancement in a heat exchanger using helically corrugated tube[J].International Communications in Heat and Mass Transfer: A Rapid Communications Journal,2011(3):340-347.
[4] A. Barba;S. Rainieri;M. Spiga .Heat transfer enhancement in a corrugated tube[J].International Communications in Heat and Mass Transfer,2002(3):313-322.
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