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An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe2O3-water

Saeid Hejri (Department of Energy, Sharif Engineering and Process Development Company (SEPDCO), Tehran, Iran)
Daryoush Kamali (Department of Mechanical Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran)
Emad Hasani Malekshah (Silesian University of Technology, Institute of Power Engineering and Turbomachinery, Gliwice, Poland)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 14 December 2020

Issue publication date: 6 July 2021

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Abstract

Purpose

The purpose of this study is analysis of the natural convection and entropy production in a two-dimensional section of the considered heat exchanger. For this purpose, the lattice Boltzmann method which is equipped with Bhatnagar–Gross–Krook model is used. This model proposes a significant accurate prediction for thermal and hydro-dynamical behaviors over free convection phenomenon. The heat exchanger is filled with Fe2O3-water nanofluid. To improve the accuracy of prediction, it is neglected to use the theoretical models for properties of nanofluid. At this end, some experimental observations are conducted, and the required rheological and thermal properties of nanofluid are measured based on laboratory work..

Design/methodology/approach

The present work focuses on the influence of different factors on the thermal behaviors and entropy production of a heat exchanger. The heat exchanger is consisted by an inner tube, an outer tube and some fins which are implanted at the surface of inner tube.

Findings

The effects of various factors like structure of inner fins, nanoparticle concentration and Rayleigh number over the heat transfer rate, local and volumetric entropy production, Bejan number, flow configuration and temperature distributions are provided.

Originality/value

The originality of this work is using a new-developed numerical method for treating natural convection and experimental measurements for thermal and rheological properties of nanofluid.

Keywords

Acknowledgements

The first author (Mr Saeid Hejri) gratefully acknowledges the scientific and financial supports of Dr Reza Dorosti (Managing Director of SEPDCO Company).

Citation

Hejri, S., Kamali, D. and Hasani Malekshah, E. (2021), "An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe2O3-water", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 31 No. 7, pp. 2308-2329. https://doi.org/10.1108/HFF-08-2020-0497

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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