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

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.

Irreversibility analysis through neural networking of the hybrid nanofluid for the solar collector optimization

“…Based on the above discussion, all pertinent suppositions are used as indicated in the existing literature 7 – 14 , 18 . Core equations are demonstrated as.…”

“…This research shows hybrid nanofluids relating to their theoretical study, thermophysical properties, solar radiation, thermal applications, and numerical estimation including machine learning. he available literature indicates that hybrid nanofluids are more effective than nanofluids in enhancing the thermal performance of base fluids as described in 13 – 18 . This is because the thermal performance of nanofluids is limited concerning their specific thermal and chemical properties.…”

Statistical analysis of radiative solar trough collectors for MHD Jeffrey hybrid nanofluid flow with gyrotactic microorganism: entropy generation optimization

“…The simulations of hybrid nanoparticles for heat transfer in a stenotic curved artery were done by Sharma et al (2022b). Radiation impact on the axisymmetric nanofluid flow by stagnation point past a radially elongating Riga plate was analyzed by Khashi et al (2023). Gandhi et al (2023) studied the different morphological effects of the hybrid nanoparticles in the blood-mediated flow.…”

Thermal transport in nanofluid across a radiated permeable sheet with irreversible effects based on the shape of the particles

“…Zahor et al (2022) examined previous studies on entropy production in the MHD flow of HFF 33,6 nanofluids. The unsteady stagnation-point flow of a Cu-Al 2 O 3 /H 2 O hybrid nanofluid approaching a radially diminishing Riga surface subjected to heat radiation was statistically analysed by Khashi'ie et al (2022). They discovered that the thermal rate increased by the incorporation of radiation and unsteady decelerating components.…”