Experimental Study of Fluid Flow and Heat Transfer of Al2 O3 -Water Nanofluid in Helically Coiled Micro-Finned Tubes

Document Type : Research Article

Authors

1 department of heat and fluid faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

2 Department of Heat and Fluid, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

Abstract

In this study, inactive methods of enhancing heat transfer in the shell and tube heat exchangers, such as using smooth and micro-fins helically coiled tubes, and employing nanofluids as the working fluid, are investigated experimentally. A number of experiments are carried out for the flow of the Al2 O3 -water nanofluid in a shell and tube heat exchangers with helically coiled smooth as well as micro-finned tubes, and the pressure drop and the heat transfer coefficient are measured. The experiments are conducted for the Dean number ranging from 500 to 4000, for the fin helix angle between 18 and 25º, and for the nanofluid volume fractions of 0, 0.5 and 1%. The average heat transfer coefficients of the tube side of heat exchangers in each case is calculated using the Wilson plot method. Empirical correlations are proposed for the heat transfer coefficient of the nanofluid following through the tube-side of the heat exchanger in terms of the Dean number, the fin helix angle, the fin height and the volume fraction of the nanofluid. Based on the experimental results, using micro-finned coiled tubes together with increasing the micro-fin helix angle and employing nanofluid enhance the heat transfer while increasing the pressure drop through the heat exchanger.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 2
May 2020
Pages 509-524

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