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Open AccessArticle

Natural Convection and Entropy Generation in a Square Cavity with Variable Temperature Side Walls Filled with a Nanofluid: Buongiorno’s Mathematical Model

1
Department of Theoretical Mechanics, Tomsk State University, Tomsk 634050, Russia
2
Department of Nuclear and Thermal Power Plants, Tomsk Polytechnic University, Tomsk 634050, Russia
3
Department of Mathematics, Babeş-Bolyai University, Cluj-Napoca 400084, Romania
*
Author to whom correspondence should be addressed.
Entropy 2017, 19(7), 337; https://doi.org/10.3390/e19070337
Received: 15 May 2017 / Revised: 19 June 2017 / Accepted: 26 June 2017 / Published: 5 July 2017
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
Natural convection heat transfer combined with entropy generation in a square cavity filled with a nanofluid under the effect of variable temperature distribution along left vertical wall has been studied numerically. Governing equations formulated in dimensionless non-primitive variables with corresponding boundary conditions taking into account the Brownian diffusion and thermophoresis effects have been solved by finite difference method. Distribution of streamlines, isotherms, local entropy generation as well as Nusselt number has been obtained for different values of key parameters. It has been found that a growth of the amplitude of the temperature distribution along the left wall and an increase of the wave number lead to an increase in the average entropy generation. While an increase in abovementioned parameters for low Rayleigh number illustrates a decrease in average Bejan number. View Full-Text
Keywords: natural convection; square cavity; sinusoidal wall temperature; nanofluids; Brownian diffusion; thermophoresis; numerical method natural convection; square cavity; sinusoidal wall temperature; nanofluids; Brownian diffusion; thermophoresis; numerical method
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Sheremet, M.A.; Grosan, T.; Pop, I. Natural Convection and Entropy Generation in a Square Cavity with Variable Temperature Side Walls Filled with a Nanofluid: Buongiorno’s Mathematical Model. Entropy 2017, 19, 337.

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