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Second law analysis of magneto-natural convection in a nanofluid filled wavy-hexagonal porous enclosure

Seyyed Masoud Seyyedi (Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran)
A.S. Dogonchi (Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran)
M. Hashemi-Tilehnoee (Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran)
D.D. Ganji (Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran)
Ali J. Chamkha (Department of Mechanical Engineering, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar, Saudi Arabia and Department of RAK Research and Innovation Center, American University of Ras Al Khaimah, Ras Al Khaimah, United Arab Emirates)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 19 February 2020

Issue publication date: 15 October 2020

120

Abstract

Purpose

Natural convection heat transfer analysis can be completed using entropy generation analysis. This study aims to accomplish both the natural convection heat transfer and entropy generation analyses for a hexagonal cavity loaded with Cu-H2O nanoliquid subjected to an oriented magnetic field.

Design/methodology/approach

Control volume-based finite element method is applied to solve the non-dimensional forms of governing equations and then, the entropy generation number is computed.

Findings

The results portray that both the average Nusselt and entropy generation numbers boost with increasing aspect ratio for each value of the undulation number, while both of them decrease with increasing the undulation number for each amplitude parameter. There is a maximum value for the entropy generation number at a specified value of Hartmann number. Also, there is a minimum value for the entropy generation number at a specified value of angle of the magnetic field. When the volume fraction of nanoparticles grows, the average Nusselt number increases and the entropy generation number declines. The entropy generation number attains to a maximum value at Ha = 14 for each value of aspect ratio. The average Nusselt number ascends 2.9 per cent and entropy generation number decreases 1.3 per cent for Ha = 0 when ϕ increases from 0 to 4 per cent.

Originality/value

A hexagonal enclosure (complex geometry), which has many industrial applications, is chosen in this study. Not only the characteristics of heat transfer are investigated but also entropy generation analysis is performed in this study. The ecological coefficient of performance for enclosures is calculated, too.

Keywords

Citation

Seyyedi, S.M., Dogonchi, A.S., Hashemi-Tilehnoee, M., Ganji, D.D. and Chamkha, A.J. (2020), "Second law analysis of magneto-natural convection in a nanofluid filled wavy-hexagonal porous enclosure", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 11, pp. 4811-4836. https://doi.org/10.1108/HFF-11-2019-0845

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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