CONTROL VOLUME ANALYSIS OF MHD NANOFLUID FLOW AS A RESULT OF A STRETCHING SURFACE AND SUCTION
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Date
2020-05
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THE CATHOLIC UNIVERSITY OF EASTERN AFRICA
Abstract
Numerous heat transfer processes in engineering problems in areas such as nuclear reactors and electronics, as well as in biomedicine and food industry require the knowledge of nanofluids, consequently investigations leading to understanding of the role played by nanofluids in heat transfer enhancement in these processes is vital. Currently, numerous studies are being conducted on nanofluids for the benefits associated with low energy costs and less negative environmental impact in industry and society. In various studies, water is commonly used as a base for nanofluids in heat transfer applications due to its ability and availability for heat transport. In most of these investigations, influence of nanoparticles has been analysed to determine enhancement of energy transfer on stretched sheets. In this research, magnetohydrodynamic mixed convection flow of a nanofluid over a porous linearly stretching sheet with water equally as the base fluid and either copper or silver as nanoparticles is examined and analysed. The physical problem is modeled using systems of unsteady non-linear differential equations subject to prescribed boundary and initial conditions, which are then solved using finite volume approach. These differential equations comprise of the classical continuity, momentum, concentration and energy equations, which are subsequently non-dimensionalized and discretized in rectangular domain. The effect of nanoparticle volume fraction, Hartmann number, suction, dimensionless time parameter and stretching parameter values on characteristics of velocity, temperature and concentration profiles, and skin friction, heat transfer, and mass transfer coefficients are discussed. From the results, increase in nanoparticle volume fraction decreases velocity profiles and increases temperature profiles of nanofluid. Also increase in stretching parameter and suction enhance velocity profiles but decreases temperature profiles of the nanofluid.
Description
Dissertation
Keywords
CONTROL VOLUME ANALYSIS, MHD NANOFLUID FLOW, STRETCHING SURFACE AND SUCTION