Modelling the impact of Magnetohydrodynamics (MHD) nanofluid flow on cooling of engineering systems

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Stellenbosch : Stellenbosch University
ENGLISH ABSTRACT: The flow investigations regarding nonlinear materials are extremely important in the applied science and engineering areas to explore the properties of flow and heat transfer. Recent advancement in nanotechnology has provided a veritable platform for the emergence of a better ultrahigh-performance coolant known as nanofluid for many engineering and industrial technologies. In this study, we examine the influence of a magnetic field on the heat transfer enhancement of nanofluid coolants consisting of Cu-water, or Al2O3-water, or Fe3O4-water over slippery but convectively heated shrinking and stretching surfaces. The model is based on the theoretical concept of magnetohydrodynamics governing the equation of continuity, momentum, energy, and electromagnetism. Based on some realistic assumptions, the nonlinear model differential equations are obtained and numerically tackled using the shooting procedure with the Runge-Kutta-Fehlberg integration scheme. The existent of dual solutions in the specific range of shrinking surface parameters are found. Temporal stability analysis to small disturbances is performed on these dual solutions. It is detected that the upper branch solution is stable, substantially realistic with the smallest positive eigenvalues while the lower branch solution is unstable with the smallest negative eigenvalues. The influence of numerous emerging parameters on the momentum and thermal boundary layer profiles, skin friction, and Nusselt number are depicted graphically and quantitatively discussed.
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Thesis (MMil)--Stellenbosch University, 2021.
Heat transfer, Heat -- Transmission, Nanofluids, Boundary layer (Meteorology), Magnetohydrodynamics (MHD), Nusselt number, Runge-Kutta formulas, Differential equations, Partial, Control theory, UCTD