Abstract
A numerical analysis is performed to investigate the laminar, free convection flow in an Open Enclosure Using Lattice Boltzmann Method (LBM) in the presence of Carbon nanotube and Cu nanoparticles. The problem is studied for different volume fractions of nanoparticles, and aspect ratio of the cavity for various Rayligh numbers. The volume fraction of added nanoparticles to water (as base fluid) is lower than 1% to make dilute suspensions. The study presents a numerical treatment based on LBM to model convection heat transfer of Carbon nanotube based nanofluids. Results show that adding a low value of Carbon nanotube to the base fluid led to significant enhancement of convection rate. Results show that adding nanoparticles to the base fluid enhances the rate of natural convection in a cavity. Make a comparison between Carbon nanotube and Cu-nanoparticles shows that the Carbon nanotube-nano- particle has better performance to enhance convection rate at comparison with Cu- nanoparticles.
Highlights
The enhancement of fluids heat transfer is an interesting topic for different kinds of industrial and engineering applications
They presented an increase of Nuave about 7.5%, 12%, 15.5% and 20%, respectively, by adding a volume fraction of added Cu nanoparticles to the while the Prandtl number of based fluid (Water) equal to 4%, 6%, 8% and 10% when Gr = 104
Saleh et al [10] studied convection heat transfer of a nanofluid-filled trapezoidal enclosure. They investigated the effect of different volume fraction of Al2O3 and Cu nanoparticles on heat transfer enhancement of Water as base fluid. They reported an enhancement of natural convection heat transfer about 2.4%, 4.7%, 7.1%, 9.5% and 11.9% by adding a φ = 1%, 2%, 3%, 4% and 5% of Al2O3 nanoparticles when the angle of side walls are 23.96 ̊ at Gr = 105 and for Cu nanoparticles at same condition the values are about 3.9%, 7.9%, 11.8%, 15.7%, 19.5%
Summary
The enhancement of fluids heat transfer is an interesting topic for different kinds of industrial and engineering applications. Saleh et al [10] studied convection heat transfer of a nanofluid-filled trapezoidal enclosure They investigated the effect of different volume fraction of Al2O3 and Cu nanoparticles on heat transfer enhancement of Water as base fluid. Nemati et al [25] applied LBM to investigate the effect of Cu, Al2O3 and CuO nanoparticles on mixed convection in a lid-driven cavity Their results show that adding nanoparticles increase the rate of mixed convection heat transfer of the base fluid for all tested Reynolds numbers. The investigation of the heat transfer enhancement by adding the Carbon nanotube to the base fluid in an open-ended cavity is the main aim of the present study. The aspect ratio of the cavity is studied as an important geometric parameter of the 2D cavities in different condition to exhibit the role of this parameter on both heat transfer rate and fluid flow of the base fluid and the nanofluid
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