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Dual solutions of unsteady two-dimensional electro-magneto-hydrodynamics (EMHD) axisymmetric stagnation-point flow of a hybrid nanofluid past a radially stretching/shrinking Riga surface with radiation effect

Najiyah Safwa Khashi’ie (Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan, Universiti Teknikal Malaysia Melaka and Hang Tuah Jaya, Durian Tunggal, Melaka, Malaysia)
Iskandar Waini (Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan, Universiti Teknikal Malaysia Melaka and Hang Tuah Jaya, Durian Tunggal, Melaka, Malaysia)
Norihan Md Arifin (Institute for Mathematical Research, Universiti Putra Malaysia, Serdang, Selangor, Malaysia and Department of Mathematics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia)
Ioan Pop (Department of Mathematics, Babes-Bolyai University, Cluj-Napoca, Romania and Academy of Romanian Scientist, Ilfov Street, Bucharest Romania)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 16 August 2022

Issue publication date: 3 January 2023

66

Abstract

Purpose

This paper aims to analyse numerically the unsteady stagnation-point flow of Cu-Al2O3/H2O hybrid nanofluid towards a radially shrinking Riga surface with thermal radiation.

Design/methodology/approach

The governing partial differential equations are transformed into a set of ordinary (similar) differential equations by applying appropriate transformations. The numerical computation of these equations including the stability analysis is conducted using the bvp4c solver.

Findings

Two solutions are possible within the allocated interval: shrinking parameter, unsteadiness decelerating parameter, electro-magneto-hydrodynamics (EMHD) parameter, nanoparticles volumetric concentration, radiation parameter and width parameter, whereas the stability analysis certifies that the first (upper branch) solution, which fulfills the boundary conditions is the physical/real solution. The EMHD parameter generated from the application of Riga plate enhances the skin friction coefficient as well as the heat transfer process. The width parameter d is also one of the factors in the deterioration of the skin friction coefficient and heat transfer rate. It is crucial to control the width parameter of the magnets and electrodes to obtain the desired outcome. The radiation parameter is not affecting the boundary layer separation because the critical values are unchanged. However, the addition of radiation and unsteadiness decelerating parameters boosts the thermal rate.

Originality/value

The results are novel and contribute to the discovery of the flow and thermal performance of the hybrid nanofluid subjected to a radially shrinking Riga plate. Besides, this work is beneficial to the other researchers and general audience from industries regarding the factors which contribute to the thermal enhancement of the working fluid.

Keywords

Acknowledgements

The research supports are received from the Universiti Teknikal Malaysia Melaka and Ministry of Higher Education Malaysia through the FRGS/1/2021/STG06/UTEM/03/1. The authors also wish to express their sincere thanks to the two competent referees for their good comments and suggestions.

Conflict of Interest: The authors declare that there is no conflict of interest.

Funding: Khashiy’ie, Ministry of Education Malaysia (FRGS/1/2021/STG06/UTEM/03/1).

Citation

Khashi’ie, N.S., Waini, I., Arifin, N.M. and Pop, I. (2023), "Dual solutions of unsteady two-dimensional electro-magneto-hydrodynamics (EMHD) axisymmetric stagnation-point flow of a hybrid nanofluid past a radially stretching/shrinking Riga surface with radiation effect", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 1, pp. 333-350. https://doi.org/10.1108/HFF-04-2022-0225

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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