Open Access

ARTICLE

Mixed Convection in a Lid-Driven Square Cavity With Heat Sources Using Nanofluids

Ilhem Zeghbid¹, Rachid Bessaïh¹

1 University Constantine 1, Department of Mechanical Engineering, LEAP Laboratory, Route de Ain El. Bey, Constantine 25000, ALGERIA.

* Corresponding Author:Email: ; Phone/Fax: +213 31 81 88 96.

Fluid Dynamics & Materials Processing 2017, 13(4), 251-273. https://doi.org/10.3970/fdmp.2017.013.251

Abstract

This paper presents a numerical study of two-dimensional laminar mixed convection in a lid-driven square cavity filled with a nanofluid and heated simultaneously at a constant heat flux q” by two heat sources placed on the two vertical walls. The movable wall and the bottom wall of the cavity are maintained at a local cold temperature T_C, respectively. The finite volume method was used to solve the equations of flow with heat transfer across the physical domain. Comparisons with previous results were performed and found to be in excellent agreement. Results were presented in terms of streamlines, isotherms, vertical velocity profile, and local and average Nusselt numbers for Rayleigh number in the range (Ra=10³-10⁶), Reynolds number (Re=1-500), solid volume fraction of nanoparticles (ϕ=0-0.10), heat sources locations, and type of nanofluids (Cu, Ag, Al₂O₃ and TiO₂). The influence of the relevant parameters such as the Rayleigh number, the Reynolds number and the volume fraction of the nonofluid on the average Nusselt number was studied in detail. It was found that the average Nusselt number increases with the increase of Rayleigh number and solid volume fraction of nanofluids. The results show that the Cu-water nanofluid improves heat transfer, and that the heat sources position has an influence on the flow and thermal fields, and on the local and average Nusselt numbers.

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Keywords

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