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Macro and mesoscale simulations of free convective heat transfer in a cavity at various aspect ratios

Che Sidek, Nor Azwadi and Irwan, M. A. M. (2010) Macro and mesoscale simulations of free convective heat transfer in a cavity at various aspect ratios. Journal of Applied Sciences, 10 (3). 203 - 208. ISSN 1812-5654

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Official URL: http://scialert.net/abstract/?doi=jas.2010.203.208

Abstract

In this study, we present the behavior of free convective heat transfer in a rectangular cavity by two entirely different scales of numerical methods, namely a mesoscale and macroscale methods. The cavity is bounded by two vertical isothermal walls kept at different temperatures and by two horizontal perfectly conducting walls. The heat flow simulations were carried out across the two isothermal walls by varying the aspect ratio of cavity with six different values -0.2, 0.5, 1.5, 2.0, 2.5 and 3.0. The macroscale simulations were performed by solving the Navier-Stokes equation using finite difference scheme while the mesoscale simulations were done using lattice Boltzmann method. This study found that the heat transfer mechanism, fluid flow behavior in terms of formation, size and strength of vortex are critically depending on the aspect ratio of the geometry. Numerical results also show excellent agreement between these two scales of simulations.

Item Type:Article
Uncontrolled Keywords:aspect ratio, finite difference, lattice boltzmann, natural convection, navier-stokes equation
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:26280
Deposited By: Liza Porijo
Deposited On:29 Jun 2012 03:43
Last Modified:23 Jul 2012 01:44

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