ABSTRACT Offshore pipeline and flow line systems define a variety of subsea architectures associated with Floating Production Storage and Offloading units (FPSOs) or Floating Storage and Offloading units (FSOs) that are usually employed for oil and gas production in deep and ultra deep waters. The design of such transmission facilities, must satisfactorily account for various phenomena such as hydrodynamic wave loading, fluid transport velocity, operating pressure and temperature of the inte...
SUMMARY Metal forming is a production technique which enhances economic use of engineering material by minimizing metal wastage that occurs in machining processes such as lathe turning and milling. This technique employs a press tool for mass production of parts that are dimensionally compatible. The press tool comprises the section that provides the force the press, and the tooling section the die. Investigation of stretch-forming conditions to produce a si dome in order to determine the opt...
ABSTRACT Bio-fuels (Biodiesel and Bio-ethanol fuels) are synthesized from various Nigerian crops (palm(Elaeis Guineensis) wine, raffia(Raffia Vinefera) trunk, sugar cane(Saccharum L), physic nut seed (Jatropha Curcas), castor bean seed(Ricinus Communis), sandbox seed (Hura Crepitans) and African bush mango nut (Dika Nut) (Irvingia Gabonensis)) to serve as alternative fuels for internal combustion engines. The direct base-catalyzed trans-esterification process is employed in the biodiesel pr...
ABSTRACT Experimental investigation of anaerobic digestion of the organic fraction of municipal solid waste (MSW) in an upflow bioreactor with central substrate dispenser (UBCSD) is presented. The UBCSD consists of two similar size bioreactors joined by a central substrate dispenser (CSD). The UBCSD is a component of an integrated system of bioreactors also containing the upflow anaerobic sludge blanket (UASB) reactor and the continuous stirred tank reactor (CSTR), assembled systematical...
ABSTRACT The Energy - Exergy based performance analysis of the Solid Adsorption Solar Refrigerator is presented. The system comprises the collector/generator/adsorber, the condenser and the evaporator. It utilizes activated carbon/methanol as its adsorbent/adsorbate working combination. The exergy performance analysis of this refrigerator involves detailed assessment of all the following sub-processes that make up the refrigeration cycle, which are isosteric heat-up phase, desorption phas...
Abstract Problems associated with boilers are a major contributor to load losses in coal-fired power plants. The boiler furnace exit temperature is a key indicator of the combustion and heat transfer processes taking place and has a profound impact on the operation of the heat exchangers downstream of the furnace. Having a model that can predict the furnace exit temperature and heat flux distributions may enable furnace performance to be predicted without having to conduct extensive experimen...
ABSTRACT This thesis explores the development of a fixed wing unmanned aerial vehicle for delivery given the deplorable condition of roads leading to certain rural medical centers. This unmanned aerial vehicle has to be of the fixed wing type due to the weight to be carried and the distance which is to be covered. The thesis seeks to provide a greener alternative using a recyclable material i.e. strawboard for the body of the UAV, the UAV is also of a modular design hence it can easily be con...
Abstract Machining of Inconel 718 with whisker reinforced ceramic tool gave better performance in terms of tool life under high-pressure coolant supplies up to 15MPa compared to conventional coolant supplies. The use of 15MPa coolant supply pressure tend to suppress notching during machining thus improving tool life, while the use of higher coolant supply pressure of 20.3MPa did not show improvement in tool life due probably to accelerated notch wear caused by water jet impingement erosion. C...
ABSTRACT . The ice-maker freezer) was designed, constructed and tested. The ice-making machine is to freeze 27kg of water in 9 diflerent comparlments in 12 hrs. The quantity of heat lo be rmoved in order to achieve peezing is 12556.89 and this is used to determine the refiigeration tonnage of the machine (0.124 ton).' Polyurethane and Galvanized steel sheets have been selected for insulation and cabinet materials respectively due to their low thermal conductivities and high 'corrosion resista...
ABSTRACT Intelligent Tool Condition Monitoring (TCM) is an essential requirement in the drive towards automated machining operations. In this paper, a Multi-Layered Perceptron (MLP) neural net-work model has been developed for on-line condition monitoring of tool wear in high-speed turning of Titanium-based alloy (Ti-6Al-4V). Machining trials were conducted for typical rough and finish turning operations with cutting speed (90 – 120 m/min), feed rate (0.15 – 0.2 mm/rev), and depth of cut ...
Abstract This paper presents experimental and simulation study of the effects of stress on microstructure and failure morphology of low carbon steel under plane stress conditions. The study has revealed large extension of grains at the point of fracture and, stress and strain looped around the pearlitic faces of the microstructure matrix. The stress and strain distributions in the microstructure have shown that concentration of stress and strain on the pearlite were instrumental to oblique fr...
Abstract This paper investigates the dynamical behaviour of a duffing oscillator using bifurcation diagrams. There has been growing interest and challenges in engineering dynamics to characterize dynamical systems that are chaotic using bifurcation diagrams. The relevant second order differential equations using Runge-Kutta method were solved for ranges of appropriate parameters. The solutions obtained were used to produce the bifurcation diagrams using Microsoft excel 2007. Since an average ...
ABSTRACT Solar Photovoltaic (PV) can be considered as one of the most reliable and promising renewable systems. This is of great importance for developing countries like Nigeria especially in the rural communities where there is little or no access to electricity. The use of solar energy will no doubt contribute to the improvement of the living conditions of these villag- ers. Solar PV systems have been installed in some villages in Nigeria but unfortunately, the expected benefits from us- in...