ABSTRACT This research work focused on the use of an hybrid RANS-LES turbulence model in simulating and checking the drag performance characteristics of an aerodynamic vehicle. The Spalart-Allmaras shear stress transport (SST)- Scale Adaptive Simulation (SAS) Turbulence model was selected for use, and with the help of OpenFOAM Finite Volume Computational Fluid Dynamic Solver the simulation algorithm was set and carried out in a total time step of 4000. Convergence was achieved under the stip...
ABSTRACT Performance analysis of a model pulverized coal combustion system is undertaken. The system consists of a hopper, screw conveyor, blower, electric motor, among others. The design and construction of the system focused on the following procedures in this work: The outlet of the pulverized coal from the silo opens directly into the receiving hopper of the screw conveyor. The drive of the blower is connected to the drive of the screw conveyor via bearings, pulleys, belt and gears. This ...
Abstract A Mobile Ad-hoc Data Network (MADNET) is a self-configuring, infrastructure-less network of mobile devices (nodes) where nodes communicate with each other using multi-hop wireless links. Node failures and arbitrary movement of nodes at higher node velocity break the routes and lead to the frequent operation of rebuilding routes that consume lots of the network resources and the energy of nodes. This study, analyses the impact of node velocity on performance of two MADNET Transport p...
ABSTRACT This work analysed the performance of an automatic control system for the online blending of petrol with corrosion inhibitor in the direct, continuous electronic fuel injection automobile engine. The automatic control system was designed by superimposing a feedforward control system on a feedback control system. The design of the automatic control system was analysed by the method of direct substitution. The governing equations used in analysing the blending process, as well as the ...
ABSTRACT Environmental pollution with petroleum and petrochemical products has been recognized as one of the most important and serious challenges facing environment engineers. Disposal from mechanic sites, accidental leakages from petroleum carrying ships, vandalization of pipelines, have all contributed to the current common oil pollution in Nigeria today. The currently used physical and chemical remediation are effective for the degradation of petroleum products but the affected medium lo...
ABSTRACT Data storage and retrieval are at the centre of today’s applications. Currently, no organization can effectively carry on its activities without one form of database or the other. Indeed, one of the key challenges of information technology organizations is how to ensure quality and reliable database administration. Consequently, if the database and the server that support the applications are unavailable it could lead to considerable costs in terms of efficiency, loss of revenue a...
The present research discusses a problem of seal damages in dam gates due to influence of water flow through sluices passage way. The low level sluices (L.L.S) of Merowe dam were taken as a research field to investigate the influence of flow on the gate seal. The core of the problem is that the rubbery seal of L.L.S gates is damaged and washed out during yearly operation in flooding season. In previous years there is many solutions has been tried in two ways: first way is by improvement ...
Recently, one of the major and serious worldly concerns is the limitation of energy resources. Sudan, in specific, confronts a critical crises relatingto fossil fuel resources, and mostly concerning the production of electricity energy from fired thermal power plants and hydropower. The primary energy supplies in the Sudan are 29% oil and gas, 71% hydropower. In this study, the potentials for renewable energy to generate electricity in the Sudan is analyzes. The results show that, they...
ABSTRACT Thousands of Base Station Antennas (BSA) have been installed in Nigeria to support the development of mobile telephony. At the same time there is a public concern about the electromagnetic fields radiated by these antennas, particularly there is a great fear by those living in the vicinity of these antennas, of being exposed to the harmful effects of this radiation. This fear has created the need to investigate and establish the level of radiation and also determine whether this lev...
ABSTRACT The study examined the state of health and safety risk management practices in the building sector of the construction industry and has the objectives to: evaluate the construction risks inherent in the building sector of the construction industry; examine the health and safety risk management processes adopted by the construction industry in Nigeria; validate the existence of identified factor(s) militating against the implementation of health and safety practices in the constructi...
This paper will aim at shedding light on the efficiency of zif-8 nano-particles. It will show that zif-8 can be a leading tool in water treatment having a large surface area, high adsorption capacity and thermal stability. Zif-8 was also used to enhance characteristics of several materials such as MF-ZIF-8 sponge composite to enhance hydrophobicity for the selective sorption of oil. Also, its treatment was studied on electrospun nylon 6,6 NFM to enhance oil spill adsorption and we compared Ni...
ABSTRACT In this work, the state of stress between adhesively bonded single lap-joints was determined. The state of stress between adhesively bonded single lap-joints was determined by using a linear elastic analysis and experimental testing. In the analysis part of this work, the shear and normal stresses in an adhesively bonded single lap –joints were predicted by subjecting the joint to tension; shear force, and bending moments. Differential equations were used to model the problem and ...
ABSTRACT In this work, the state of stress between adhesively bonded single lap-joints was determined. The state of stress between adhesively bonded single lap-joints was determined by using a linear elastic analysis and experimental testing. In the analysis part of this work, the shear and normal stresses in an adhesively bonded single lap –joints were predicted by subjecting the joint to tension; shear force, and bending moments. Differential equations were used to model the problem and ...
ABSTRACT The importance of Self-Excited Induction Generator (SEIG) cannot be neglected when it comes to low cost of maintenance requirement, low cost of operation, low operational cost, high reliability and availability. This dissertation presents a dynamic analysis of an autonomous Self-Excited Induction Generator (SEIG) showing dynamic loss of load performance. Analysis is carried out based of the d-q axis model, while considering the performance characteristics of the machine at constant ...
ABSTRACT The primary objective of this work is to form the foundation of a Road Management Maintenance System (RMMS) that Road Maintenance Agencies like FERMA can immediately implement to make better decisions pertaining to rehabilitation options. Further, this is to allow for appropriate decisions about the best type of maintenance and rehabilitation interventions to apply to the poor state of arterial roads taking into consideration various factors, least of which are the type and ext...