Thesis Ph.D. ((Applied Mathematics)) -- University of Limpopo, 2022 / The world is under threat from the devastating effects of the continued
depletion of the Ozone layer. Increased global warming is causing
catastrophic ecological damage and imbalance due to accelerated
melting of glaciers, rampant runaway veld res, widespread
floods and other extreme events. The delegates to the Cop26 Climate Change
Summit were reminded that the continued burning of fossil fuels is
releasing carbon into the atmosphere at an unprecedented pace and
scale and that the world is already in trouble. Complete substitution
of fossil fuels with clean energy sources is the only solution through
which the world can be saved from the deleterious effects of global
warming. However, total dependence on renewable energy sources
can only be possible through novel technology that enables efficient
energy utilization and conservation. For instance, the evolution of
advanced techniques in manufacturing processes has led to the reduction
in the size of various industrial and engineering designs that
consume reduced amounts of energy. Efficient energy utilization in
thermo-fluid flow systems can be achieved through entropy generation
minimization. Entropy is a thermodynamic quantity that represents
the unavailability of a system's thermal energy for conversion into
mechanical work.
In this study, thermodynamic analysis of reactive variable properties
third-grade fluid flow in channels with varied geometries and subjected
to different physical effects was investigated with the second law of
thermodynamics as the area of focus. Entropy generation and inherent
irreversibility analysis were the main focus of the study where the
sensitivities of these quantities to the embedded parameters were numerically
and graphically described and analysed. The semi-analytic Adomian decomposition method, the semi-implicit fi nite difference scheme and the spectral quasilinearisation method were employed to solve the nonlinear differential equations modelling the
flow systems. The results reveal that the effects of the parameters on flow velocity,
fluid temperature, entropy generation and inherent irreversibility
cannot be neglected. In particular, conditions for entropy generation
minimization were successfully established and documented. / University of Limpopo
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ul/oai:ulspace.ul.ac.za:10386/3967 |
| Date | January 2022 |
| Creators | Thosago, Kgomotshwana Frans |
| Contributors | Rundora, L., Adesanya, S. O. |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | xx, 186 leaves |
| Relation |
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