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Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization

The aim of this paper is to analyze the laminar free convective flow generated by two identical hot blocks in two-dimensional enclosure cooled by the sides in order to optimize the heat transfer. The top wall and the flat surfaces on bottom wall are adiabatic except for the active sources located sy...

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Main Authors: Naffouti, T., Zinoubi, J., Che Sidik, N. A., Maad, R. B.
Format: Article
Published: 2016
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/68870/
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spelling my.utm.688702017-11-20T08:52:18Z http://eprints.utm.my/id/eprint/68870/ Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization Naffouti, T. Zinoubi, J. Che Sidik, N. A. Maad, R. B. TJ Mechanical engineering and machinery The aim of this paper is to analyze the laminar free convective flow generated by two identical hot blocks in two-dimensional enclosure cooled by the sides in order to optimize the heat transfer. The top wall and the flat surfaces on bottom wall are adiabatic except for the active sources located symmetrically. Each source of a rectangular form is heated at a uniform temperature while the Prandtl number is fixed at 0.71. Thermal Lattice Boltzmann model of D2Q4-D2Q9 is applied to solve the thermal flow problem. Numerical simulations have been conducted to reveal the effects of various parameters; Rayleigh number 103 ≤ Ra ≤ 106, spacing between blocks 0.1 ≤ D ≤ 0.6, block height 0.05 ≤ H ≤ 0.4 and aspect ratio of the enclosure 1 ≤ A ≤ 4 on fluid flow and heat transfer. The computational results by Lattice Boltzmann method have been found to be in good agreement with previous works. The results are presented in the form of isotherms and streamlines plots as well as the variation of the average Nusselt number along horizontal and vertical hot walls. It is found that increasing Rayleigh number and distance between active blocks enhance the heat transfer. The simulations show that the block height and aspect ratio are the most important parameters affecting dynamic and thermal fields and consequently the heat transfer efficiency in the enclosure. 2016 Article PeerReviewed Naffouti, T. and Zinoubi, J. and Che Sidik, N. A. and Maad, R. B. (2016) Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization. Journal of Applied Fluid Mechanics, 9 (1). pp. 419-430. http://www.scopus.com
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Naffouti, T.
Zinoubi, J.
Che Sidik, N. A.
Maad, R. B.
Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization
description The aim of this paper is to analyze the laminar free convective flow generated by two identical hot blocks in two-dimensional enclosure cooled by the sides in order to optimize the heat transfer. The top wall and the flat surfaces on bottom wall are adiabatic except for the active sources located symmetrically. Each source of a rectangular form is heated at a uniform temperature while the Prandtl number is fixed at 0.71. Thermal Lattice Boltzmann model of D2Q4-D2Q9 is applied to solve the thermal flow problem. Numerical simulations have been conducted to reveal the effects of various parameters; Rayleigh number 103 ≤ Ra ≤ 106, spacing between blocks 0.1 ≤ D ≤ 0.6, block height 0.05 ≤ H ≤ 0.4 and aspect ratio of the enclosure 1 ≤ A ≤ 4 on fluid flow and heat transfer. The computational results by Lattice Boltzmann method have been found to be in good agreement with previous works. The results are presented in the form of isotherms and streamlines plots as well as the variation of the average Nusselt number along horizontal and vertical hot walls. It is found that increasing Rayleigh number and distance between active blocks enhance the heat transfer. The simulations show that the block height and aspect ratio are the most important parameters affecting dynamic and thermal fields and consequently the heat transfer efficiency in the enclosure.
format Article
author Naffouti, T.
Zinoubi, J.
Che Sidik, N. A.
Maad, R. B.
author_facet Naffouti, T.
Zinoubi, J.
Che Sidik, N. A.
Maad, R. B.
author_sort Naffouti, T.
title Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization
title_short Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization
title_full Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization
title_fullStr Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization
title_full_unstemmed Applied thermal lattice Boltzmann model for fluid flow of free convection in 2-D enclosure with localized two active blocks: heat transfer optimization
title_sort applied thermal lattice boltzmann model for fluid flow of free convection in 2-d enclosure with localized two active blocks: heat transfer optimization
publishDate 2016
url http://eprints.utm.my/id/eprint/68870/
http://www.scopus.com
_version_ 1643655987542884352
score 13.211869

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