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Numerical investigation of laminar heat transfer and fluid flow characteristics of Al2O3 nanofluid in a double tube heat exchanger

Ebrahim Tavousi (School of Engineering and the Built Environment, Faculty of Computing, Engineering and the Built Environment, Birmingham City University, Birmingham, UK)
Noel Perera (School of Engineering and the Built Environment, Faculty of Computing, Engineering and the Built Environment, Birmingham City University, Birmingham, UK)
Dominic Flynn (Department of Vehicle Efficiency, Jaguar Land Rover, Gaydon, UK)
Reaz Hasan (Department of Mechanical Engineering, Faculty of Mechanical Engineering, Military Institute of Science and Technology, Dhaka, Bangladesh)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 September 2023

Issue publication date: 22 November 2023

52

Abstract

Purpose

The purpose of the study is to numerically investigate the characteristics of laminar heat transfer and fluid flow in a double tube heat exchanger (DTHE) using water-aluminum oxide (Al2O3) nanofluid. The study examines the effects of nanofluid in both counter and parallel flow configurations. Furthermore, an exergy analysis is conducted to assess the impact of nanofluid on exergy destruction.

Design/methodology/approach

The single-phase method has been used for Al2O3 nanoparticles in water as base fluid in a laminar regime for Reynolds numbers from 400 to 2,000. The effects of nanoparticle volume fractions (0 to 0.1), Nusselt number, Reynolds number, heat transfer coefficient, pressure drop, performance evaluation criteria (PEC) and the impact of counter and parallel flow direction have been studied.

Findings

The findings indicate that the incorporation of nanoparticles into the water enhances the heat transfer rate of DTHE. This enhancement is attributed to the improved thermal properties of the working fluid and its impact on the thermal boundary layer. Nusselt number, heat transfer coefficient, and PEC increase by approximately 19.5%, 58% and 1.2, respectively, in comparison to pure water. Conversely, the pressure drop experiences a 5.3 times increase relative to pure water. Exergy analysis reveals that nanofluids exhibit lower exergy destruction compared to pure water. The single-phase method showed better agreement with the experimental results compared to the two-phase method.

Originality/value

Dimensionless correlations were derived and validated with experimental and numerical results for the Nusselt number and PEC for both counter and parallel flow configurations based on the Reynolds number and nanoparticles volume fraction with high accuracy to predict the performance of DTHE without performing time-consuming simulations. Also, an exergy analysis was performed to compare the exergy destruction between nanofluid and pure water.

Keywords

Acknowledgements

Conflict of interest: The authors declare that they have no conflict of interest.

Citation

Tavousi, E., Perera, N., Flynn, D. and Hasan, R. (2023), "Numerical investigation of laminar heat transfer and fluid flow characteristics of Al2O3 nanofluid in a double tube heat exchanger", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 12, pp. 3994-4014. https://doi.org/10.1108/HFF-03-2023-0114

Publisher

:

Emerald Publishing Limited

Copyright © 2023, Emerald Publishing Limited

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