Eur. Phys. J. Appl. Phys.
Volume 78, Number 3, June 2017
Materials for Energy harvesting, conversion and storage II (ICOME 2016)
|Number of page(s)||10|
|Section||Nanomaterials and Nanotechnologies|
|Published online||12 May 2017|
Numerical analysis of Al2O3/water nano-fluids natural convection and entropy generation in enclosures*
Laboratoire des Sciences et Ingénierie Maritimes, Faculté de Génie Mécanique, USTO Mohamed Boudiaf, BP 1505 El M’naouer Oran, Algeria
a e-mail: email@example.com
Revised: 4 March 2017
Accepted: 6 March 2017
Published online: 12 May 2017
The aim of this work is to analyze the natural convection phenomena and entropy generation of water-based Al2O3 nanofluids in square enclosure. The simulated domain corresponds to a square cavity heated from below and cooled from the top. The left and right walls are heated up to a height H = (3/4 W) and are adiabatic in the remaining part (1-H). Numerical investigations have been carried out based on coupled partial differential equations of momentum and energy which are solved using finite volume method. The effective thermal conductivity of the nanofluid was expressed by the Maxwell-Garnetts model however the dynamic viscosity was calculated according to the Brinkman formula. The obtained results were presented by average Nusselt number, streamlines, isotherms and entropy generation with various pertinent parameters, namely, Rayleigh number (100 ≤ Ra ≤ 106), volumetric fraction of nanoparticles (1% ≤ ϕ ≤ 4% ). It was found that the heat transfer increases with the increase of Rayleigh number and volume fraction. The choice of these parameters is important to obtain maximum enhancement of heat transfer with minimum entropy generation.
© EDP Sciences, 2017
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