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Entropy 2016, 18(2), 50; doi:10.3390/e18020050

Entropy Generation and Natural Convection of CuO-Water Nanofluid in C-Shaped Cavity under Magnetic Field

1
Mechanical Engineering Department, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Kingdom of Saudi Arabia
2
Mechanical Engineering Department, College of Engineering, University of Basrah, Basrah 61004, Iraq
3
Department of Engineering, Mahdishahr Branch, Islamic Azad University, Mahdishahr 75915-35618, Iran
*
Author to whom correspondence should be addressed.
Academic Editors: Giulio Lorenzini, Omid Mahian and Kevin H. Knuth
Received: 28 November 2015 / Revised: 10 January 2016 / Accepted: 27 January 2016 / Published: 5 February 2016
(This article belongs to the Special Issue Entropy in Nanofluids)
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Abstract

This paper investigates the entropy generation and natural convection inside a C-shaped cavity filled with CuO-water nanofluid and subjected to a uniform magnetic field. The Brownian motion effect is considered in predicting the nanofluid properties. The governing equations are solved using the finite volume method with the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm. The studied parameters are the Rayleigh number (1000 ≤ Ra ≤ 15,000), Hartman number (0 ≤ Ha ≤ 45), nanofluid volume fraction (0 ≤ φ ≤ 0.06), and the cavity aspect ratio (0.1 ≤ AR ≤ 0.7). The results have shown that the nanoparticles volume fraction enhances the natural convection but undesirably increases the entropy generation rate. It is also found that the applied magnetic field can suppress both the natural convection and the entropy generation rate, where for Ra = 1000 and φ = 0.04, the percentage reductions in total entropy generation decreases from 96.27% to 48.17% for Ha = 45 compared to zero magnetic field when the aspect ratio is increased from 0.1 to 0.7. The results of performance criterion have shown that the nanoparticles addition can be useful if a compromised magnetic field value represented by a Hartman number of 30 is applied. View Full-Text
Keywords: entropy generation; natural convection; C-shaped cavity; nanofluid; magnetic field entropy generation; natural convection; C-shaped cavity; nanofluid; magnetic field
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chamkha, A.; Ismael, M.; Kasaeipoor, A.; Armaghani, T. Entropy Generation and Natural Convection of CuO-Water Nanofluid in C-Shaped Cavity under Magnetic Field. Entropy 2016, 18, 50.

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