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Intrinsic irreversibility of Al2O3–H2O nanofluid Poiseuille flow with variable viscosity and convective cooling

Felicita Almeida (Department of Mathematics, Kuvempu University, Shankaraghatta, Karnataka, India)
B.J. Gireesha (Department of Mathematics, Kuvempu University, Shankaraghatta, Karnataka, India)
P. Venkatesh (Department of Mathematics, Sahyadri Science College, Shimoga, Karnataka, India)
G.K. Ramesh (Department of Mathematics, K.L.E Society’s J.T. College, Gadag, Karnataka, India)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 November 2020

Issue publication date: 24 May 2021

130

Abstract

Purpose

This study aims to investigate the flow behavior of aluminum oxide–water nanofluid with variable viscosity flowing through the microchannel parallel with the ground, with low aspect ratio. The study focuses on the first and second law analyses of Poiseuille flow using water as the base fluid with alumina nanoparticles suspended in it. Combined effects of thermal radiation, viscous dissipation, variable viscosity, nanoparticle shape factor and volume fraction on the thermal performance are studied and the in-built irreversibility in the process is examined.

Design/methodology/approach

The governing equations with dimensions are reduced to non-dimensional equations by using dimensionless quantities. Then, the Runge–Kutta–Fehlberg shooting scheme tackles the present non-linear equations.

Findings

The outcomes of the present analysis reveal that the activation energy parameter with its increase, depletes the exergetic effectiveness of the system, thus defending the fact to keep the activation energy parameter the lowest as possible for the system efficiency. In addition, thermal radiation and Biot number enhance the release of heat energy, thereby cooling the system. Bejan number graph exhibits the decreasing behavior for the increased nanoparticle shape factor, whereas the temperature enhances with the rise in nanoparticle shape factor.

Originality/value

The effects of nanoparticle shape factor in Poiseuille flow for alumina–water nanoliquid in low aspect ratio microchannel is inspected at the earliest. Exergetic effectiveness of the system is studied and heat transfer characteristics are explored for thermal radiation effect and activation energy parameter. Besides, BeηSphere>BeηBlades.

Keywords

Acknowledgements

The authors gratefully acknowledge Department of Science and Technology, Government of India for their financial support to Department of Mathematics, Kuvempu University, Shankaraghatta, Karanataka, India under DST-FIST Program (Ref No. SR/FST/MS-I/2018-2023).

Citation

Almeida, F., Gireesha, B.J., Venkatesh, P. and Ramesh, G.K. (2021), "Intrinsic irreversibility of Al2O3–H2O nanofluid Poiseuille flow with variable viscosity and convective cooling", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 31 No. 6, pp. 2042-2063. https://doi.org/10.1108/HFF-09-2020-0575

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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