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Numerical study of natural convection of nanofluid in a semi-circular cavity with lattice Boltzmann method

Hanieh Nazarafkan (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran)
Babak Mehmandoust (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran)
Davood Toghraie (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran)
Arash Karimipour (Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 24 July 2019

Issue publication date: 30 April 2020

Abstract

Purpose

This study aims to apply the lattice Boltzmann method to investigate the natural convection flows utilizing nanofluids in a semicircular cavity. The fluid in the cavity is a water-based nanofluid containing Al2O3 or Cu nanoparticles.

Design/methodology/approach

The study has been carried out for the Rayleigh numbers from 104 to 106 and the solid volume fraction from 0 to 0.05. The effective thermal conductivity and viscosity of nanofluid are calculated by the models of Chon and Brinkman, respectively. The effects of solid volume fraction on hydrodynamic and thermal characteristics are investigated and discussed. The averaged and local Nusselt numbers, streamlines, temperature contours for different values of solid volume fraction and Rayleigh number are illustrated.

Findings

The results indicate that more solid volume fraction corresponds to more averaged Nusselt number for both types of nanofluids. It is also found that the effects of solid volume fraction of Cu are stronger than those of Al2O3.

Originality/value

Numerical study of natural convection of nanofluid in a semi-circular cavity with lattice Boltzmann method in the presence of water-based nanofluid containing Al2O3 or Cu nanoparticles.

Keywords

Citation

Nazarafkan, H., Mehmandoust, B., Toghraie, D. and Karimipour, A. (2020), "Numerical study of natural convection of nanofluid in a semi-circular cavity with lattice Boltzmann method", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 5, pp. 2625-2637. https://doi.org/10.1108/HFF-11-2018-0686

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited