In the present research, friction factor and Nusselt number in tube side of a fin-and-tube heat exchanger are experimentally determined. Two kinds of nanofluids including Al₂O₃ and CuO water-based are used and experimental results are performed for three nanoparticle volumetric concentrations (PVC) for the Reynolds number between 3000 and 15,000. The results show that both friction factor and Nusselt number enhance in the case of nanofluid as working fluid in comparison to the water and this increment is higher in the CuO nanofluid. In the Al₂O₃ nanofluid at Re = 3000, 1.92%, 15.08% and 22.46% enhancements in the Nusselt number are observed compared with the base fluid for PVC = 0.025, 0.050 and 0.075, respectively. The mentioned improvements for CuO nanofluid are obtained 10.89%, 35.50% and 46.11%, respectively. In addition, at Re = 3000, 15.27%, 9.64% and 13.80% increases in friction factor are observed for Al₂O₃ nanofluid compared with base fluid, respectively, for PVC = 0.025, 0.050 and 0.075. The mentioned increases for CuO nanofluid are obtained 7.71%, 13.97% and 19.59%, respectively. Then, correlations for friction factor and Nusselt number are derived with adequate accuracy. Finally, the optimization of this kind of heat exchanger is performed in presence of nanoparticles and their results are presented.

在本研究中，通过实验确定了翅片管式换热器管侧的摩擦系数和努塞尔数。使用包括Al ₂ O ₃和水基CuO在内的两种纳米流体，并针对雷诺数在3000至15,000之间的三种纳米体积浓度（PVC）进行了实验结果。结果表明，与水相比，在纳米流体作为工作流体的情况下，摩擦系数和Nusselt数均增加，而在CuO纳米流体中，这种增加更大。在Al ₂ O _3中在Re = 3000的纳米流体中，与PVC的基础流体分别为0.025、0.050和0.075相比，观察到的努塞尔数增加了1.92％，15.08％和22.46％。所提到的对CuO纳米流体的改进分别获得10.89％，35.50％和46.11％。另外，在Re ＝ 3000时，与基础流体相比，对于Al ₂ O ₃纳米流体，与PVC ＝ 0.025、0.050和0.075相比，分别观察到Al ₂ O ₃纳米流体的摩擦系数增加了15.27％，9.64％和13.80％。提到的CuO纳米流体的增加分别获得7.71％，13.97％和19.59％。然后，以足够的精度推导摩擦系数和努塞尔数的相关性。最后，在纳米粒子的存在下对这种热交换器进行了优化，并给出了结果。