In this paper, an experimental investigation is carried out on internal convective heat transfer of SiO₂/water nanofluids in a copper tube for a fully turbulent regime. Nusselt number and convective heat transfer coefficients of nanofluid at three different volumetric concentration (0.001%, 0.003%, 0.007%) of nanoparticles were estimated. Local convective heat transfer coefficient at different locations along the tube at varying Reynolds number was also observed. With volumetric concentration of 0.001% of SiO₂ nanoparticles, maximum enhancement observed was 8–9%. Whereas at 0.007% volumetric concentration of SiO₂ nanoparticles, a 27% enhancement in convective heat transfer coefficient was observed. The decrease in the heat transfer rate was observed in axial direction. Particle migration, chaotic movement of the nanoparticles and fluctuations in the fluid and increased thermal conductivity of the nanofluid are considered the possible reasons for this enhancement.

在本文中，针对完全湍流状态下的SiO ₂ /水纳米流体在铜管中的内部对流传热进行了实验研究。估算了纳米流体在三种不同体积浓度（0.001％，0.003％，0.007％）下的努塞尔数和对流传热系数。还观察到沿管的不同位置处的对流传热系数以不同的雷诺数变化。当SiO ₂纳米颗粒的体积浓度为0.001％时，观察到的最大增强为8–9％。而SiO _2的体积浓度为0.007％纳米粒子，对流传热系数提高了27％。沿轴向观察到传热速率的降低。颗粒迁移，纳米颗粒的混沌运动以及流体的波动以及纳米流体的热导率增加被认为是这种增强的可能原因。