Free convection analysis in a Γ-shaped heat exchanger using lattice Boltzmann method employing second law analysis and heatline visualization

HamidReza KhakRah (Department of Mechanical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran)
Mehdi Mohammaei (School of Engineering and Science, Sharif University of Technology, International Campus, Kish Island, Kish, Iran)
Payam Hooshmand (Department of Mechanical Engineering, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran)
Navid Bagheri (Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran)
Emad Hasani Malekshah (School of Mathematical Sciences, The University of Adelaide, Adelaide, Australia)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Publication date: 24 June 2019

Abstract

Purpose

The nanofluid flow and heat transfer within a heat exchanger, with different thermal arrangements of internal active bodies, are investigated.

Design/methodology/approach

For the numerical simulations, the lattice Boltzmann method is utilized. The KKL model is used to predict the dynamic viscosity of CuO-water nanofluid. Furthermore, the Brownian method is taken account using this model. The influence of shapes of nanoparticles on the heat transfer performance is considered.

Findings

The results show that the platelet nanoparticles render higher average Nusselt number showing better heat transfer performance. In order to perform comprehensive analysis, the heatline visualization, local and total entropy generation, local and average Nusselt variation are employed.

Originality/value

The originality of this work is carrying out a comprehensive investigation of nanofluid flow and heat transfer during natural convection using lattice Boltzmann method and employing second law analysis and heatline visualization.

Keywords

Citation

KhakRah, H., Mohammaei, M., Hooshmand, P., Bagheri, N. and Hasani Malekshah, E. (2019), "Free convection analysis in a Γ-shaped heat exchanger using lattice Boltzmann method employing second law analysis and heatline visualization", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/HFF-12-2018-0767

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Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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