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
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 (simi...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Published: |
Emerald Group Publishing Ltd
2023
|
| Online Access: | http://psasir.upm.edu.my/id/eprint/107419/ |
| _version_ | 1848864891151056896 |
|---|---|
| author | Khashi’ie, Najiyah Safwa Waini, Iskandar Md Arifin, Norihan Pop, Ioan |
| author_facet | Khashi’ie, Najiyah Safwa Waini, Iskandar Md Arifin, Norihan Pop, Ioan |
| author_sort | Khashi’ie, Najiyah Safwa |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T13:56:01Z |
| format | Article |
| id | upm-107419 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T13:56:01Z |
| publishDate | 2023 |
| publisher | Emerald Group Publishing Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1074192024-10-21T01:45:18Z http://psasir.upm.edu.my/id/eprint/107419/ 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 Khashi’ie, Najiyah Safwa Waini, Iskandar Md Arifin, Norihan Pop, Ioan 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. Emerald Group Publishing Ltd 2023-01-03 Article PeerReviewed Khashi’ie, Najiyah Safwa and Waini, Iskandar and Md Arifin, Norihan and Pop, Ioan (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, 33 (1). 333 - 350. ISSN 0961-5539; eISSN: 1758-6585 https://www.emerald.com/insight/content/doi/10.1108/HFF-04-2022-0225/full/html 10.1108/hff-04-2022-0225 |
| spellingShingle | Khashi’ie, Najiyah Safwa Waini, Iskandar Md Arifin, Norihan Pop, Ioan 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 |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| url | http://psasir.upm.edu.my/id/eprint/107419/ http://psasir.upm.edu.my/id/eprint/107419/ http://psasir.upm.edu.my/id/eprint/107419/ |