Browsing by Author "A. M. Obalalu"

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    Nonlinear Solar Thermal Radiation Efficiency and Energy Optimization for Magnetized Hybrid Prandtl–Eyring Nanoliquid in Aircraft
    (2022) MD. Shamshuddin; S. O. Salawu; A. M. Obalalu
    A rising demand for industrial expansion, and optimization of energy and cost have stimulated researchers to consider effective usages of solar radiation and nanomaterials. As such, this study focuses on the flow rate, thermal distribution and entropy generation of the magnetized hybrid Prandtl–Eyring nanofluid flow along the interior parabolic solar trough collector of an aircraft wing. A nonlinear solar radiation and Joule heating of the aircraft wings, and the hybridization of cobalt ferrite and copper nanoparticles are considered in an ethylene glycol (EG) base fluid. The transformed nonlinear coupled mathematical model for the hybrid Prandtl–Eyring nanofluid flow in a boundless medium with jump temperature and convective cooling boundary conditions is analytically solved. The flow dimensions and the engineering factors (shear stress and heat gradient) for various thermofluid parameter sensitivities are examined and comprehensively reported. As found, the – nanofluid has high thermal conductivity than the –EG nanofluid. It is revealed that the energy optimization of the system is upsurged by encouraging nanoparticle volume fraction. Hence, the study will benefit the thermal engineering for an advanced nanotechnology and solar aircraft efficiency.
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    Solar thermal radiation and Cattaneo-Christov heat transport in magnetohydrodynamic photovoltaic-thermal cooling systems under rotating flow
    (World Scienti¯c Publishing Company, 2025-11-11) Leila Manai; M. J. Johnson; Saleh Chebaane; A. M. Obalalu
    The integration of photovoltaic-thermal (PVT) systems with advanced cooling techniques is crucial for improving energy e±ciency and overcoming performance limitations in solar energy conversion. This study investigates the combined e®ects of solar thermal radiation, Cattaneo{ Christov non-Fourier heat transport and magnetohydrodynamic (MHD) rotating °ow on PVT cooling performance. The purpose is to provide a deeper understanding of how thermal and electromagnetic interactions in°uence heat transfer and system e±ciency, particularly under conditions where conventional Fourier-based models fall short. A carboxymethylcellulose (CMC){water-based base °uid enhanced with nanoparticles zirconium oxide (ZrO2), copper (Cu) and aluminum oxide (Al2O3) is employed as the working medium to further boost thermal conductivity and system e±ciency. A mathematical model is developed to capture the dynamics of radiative heat °ux, magnetic ¯eld, rotation and nonlinear thermal relaxation e®ects. The governing equations are transformed into dimensionless form and solved numerically using a Chebyshev collocation method. The results demonstrate that the inclusion of ZrO2, Cu and Al2O3 nanoparticles in the CMC{water base °uid signi¯cantly improves thermal conductivity, thereby enhancing the system's cooling capacity. Under solar thermal radiation, ternary hybrid nano°uids demonstrate approximately 20% superior thermal regulation. The novelty of this work lies in the synergistic analysis of MHD rotating °ow, Cattaneo{Christov heat transport and nanoparticleengineered CMC-based °uids for PVT cooling, providing new physical insights and practical guidelines for the design of high-performance renewable energy systems.
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    Thermal management of radiation mechanism over a stretchable curved surface inside the circle: performance enhancement of molybdenum disulfide and silicon dioxide hybrid nanofluid for thermal technology advancement
    (2024) A. M. Obalalu; Adil Darvesh; L. O. Aselebe; S. O. Salawu; K. Issa
    The main perspective of this research focuses on addressing the pressing industry problem related to energy inefficiency by studying the heat transfer improvement of solar radiative and heat absorption/emission phenomena over a stretchable curved sheet inside the circle. To increase the model novelty, the combined influence of thermal relaxation, Newtonian heating, radiation mechanism, and Darcy-Forchheimer are included in the problem formulation of governing equations. Furthermore, this research employs the Cattaneo–Christov heat theory model to investigate the thermal flux via utilising the abovementioned phenomenon with the purpose of advancing thermal technology. In this perspective, Molybdenumdisulfide (MoS2) with a base fluid of Propylene glycol (C3H8O2) is utilised as nanoparticles for nanofluid (NFs), and for making hybrid nanofluid (HNFs), Molybdenum disulfide (MoS2) and silicon dioxide (SiO2)are utilised with of Propylene glycol (C3H8O2). The equations are converted into ordinary Differential equations using Similarity variables. Shifted Legendre collocation scheme (SLCS) is then utilised to solve the simulation of the modelled equations. The findings show that the solar radiation effects boosted the heating performance of the MoS2 − SiO2/ C3H8O2 hybrid nanofluid.