Experimental Investigation of the Forced Convection Heat Transfer of Nanofluids in Curved Tubes

Document Type : Research Article

Authors

1 Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran

2 Mechanical Engineering Department, Khajeh Nasir Toosi University of Technology, Tehran, Iran

Abstract

In this paper, the forced convective heat transfer of Alumina/water nanofluid is experimentally investigated in uniform-temperature curved tubes in the range of 0<De<800. The curved tubes are horizontally installed inside a cubic reservoir which contains phase-change water. A review of the literature shows that analyzing the forced convective heat transfer in uniform-temperature curved tube needs more investigations. In this experimental study, Alumina/water nanofluid with the volume fraction of 0.1 and different curved tubes with the curvature of 0.116, 0.074 and 0.042 are employed. The Nusselt number is calculated after measuring the temperature of the fluid at entrance and exit. Also, the pressure drop of nanofluid inside the curved tubes has been measured. The accuracy of the experimental results has also been validated by the available theoretical data in the literature. The obtained results are reported by using the confidence interval error bars. The results show a maximum increase of 15% in Nusselt number in the presence of Alumina/water nanofluid in comparison to the base fluid. Effects of curvature on heat transfer rate are also studied which show a considerable growth in the convective heat transfer in the tube with small curvatures.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 50, Issue 2
July and August 2018
Pages 347-358

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