Engineering

Research Papers/Topics in Engineering

Development of an Experimental Model Bubbling Fluidized Bed Combustor for Combustion of Biomass

ABSTRACT Fuel flexibility and capacity to burn broad spectrum of fuels at high combustion efficiency with minimum emissions of greenhouse gases are few of several key advantages fluidized bed combustion technology has over other existing combustion technology. This report examines the design, development and testing of an experimental model Bubbling fluidized bed combustor (BFBC). The developed BFBC has unique inert bed's temperature regulating system which implies that the use of external s...

AN ALGORITHM FOR JOB SCHEDULING IN 2-MACHINE FLOW SHOP PROBLEM

ABSTRACT This paper considers the problem of scheduling in flow-shop by Johnson's Algorithm method and Genetic Algorithm method to find an optimal sequence for n jobs m-machine problem based on minimum elapsed time.

DESIGN AND CONSTRUCTION OF SELF-RUNNING PULSE BATTERY CHARGER USING SOLID-STATE DEVICES

ABSTRACT  The self-running pulse charger was designed and constructed using solid-state devices to produce pulse current for charging lead acid batteries. The aim of this research is to reduce the use of kerosene lanterns by rural dwellers and aid pupils to study at night in off-grid communities which do not have electricity. A coil of 200 turns, MJ11016 FET, NE555 IC and various values of resistors, capacitors and diodes were soldered on a printed circuit board (PCB) to ensure proper e...

EFFECT OF HEAT TREATMENT ON THE DAMAGE RATIO OF CORRODED ST 60. MN STEEL

ABSTRACT In this work, the effect of various heat treatments on ST 60Mn steel on its fatigue strength prior to use and after use was studied it was observed that by normalising for service conditions not exceeding 10 stress cycle, the fatigue strength was raised by a factor of 1 2.

THE DEVELOPMENT AND EVALUATION OF A SOLAR-POWERED REFRIGERATOR USING ACTIVATED CARBON 1 METHANOL PAIR

ABSTRACT A solar-powered adsorption refrigerator using activated carbon1methanol.pair was designed and fabricated. The refrigerator has three major components: collector,condenser, and evaporator. A 3 mm thick flat glass was used as flat plate collector. The condenser was made of spirally 'coiled copper tube immersed in pool of stagnant water contained in a reinforced concrete tank. The evaporator was fabricated from standard ' 15.6, rnm diameter copper tubing. The activated carbon used as ad...

APPLICATlON OF GENERALIZED PRESSURE PERTURBATION PRINCIPLE TO CUBIC EQUATION OF STATE FORMULATION

ABSTRACT Cubic equations of state are commonly used for predicting the properties of reservoir fluids.' They are simple to use and require few parameters during computations. They have also been found to produce results that are comparable to the more rigorous multi-parameter equations. However, they are still regarded by many as mere comprehensive correlations of fluid properties because of a number of weaknesses and /imitations. This work addresses two weaknesses of cubic equations of state...

Adaptation of Ushafa clay, Abuja, as a suitable replacement for bentonite in the foundry industry

ABSTRACT This work investigated the possible use of Ushafa clay in Abuja, Nigeria as a suitable replacement for bentonite clay in foundry use. Moulding sand mixes with compositions of 8,10 and 13 % Ushafa clay, silica sand and 5, 7,8,9,10 and 11 % coal dust additives were mulled. From each mix, cylindrical specimens were prepared and subjected to permeability, shatter index, compression and shear strength tests. The results from the Ushafa mix were compared with results from Bentonite mixes....

Recycling of Bamboo (Bambusa vulgaris Schrad) Recovered from Scaffold into Material for Furniture Production

Abstract Interest is growing daily on the utilization of bamboo as a reliable supplement to wood in furniture production to mitigate the scarcity of wood raw material supply. This study explored the viability of recycling bamboo recovered from scaffold into intermediate raw material for indoor furniture production. Strips were processed from the recovered Bambusa vulgaris Schrad and were subjected to conventional treatment methods with some modification to simplify the treatment. The durabil...

ASSESSMENT OF THE NOISE LEVEL GENERATED DURING PLOUGHING AND HARROWING OPERATIONS IN IBADAN NIGERIA

ABSTRACT  In an attempt to meet the food demand by the ever increasing human population, the use of machines in the performance of agricultural operations is increasingly being emphasized. Two of the most common operations for which machines are used on the farm are ploughing and harrowing. Tractor operators who perform these functions are known to spend long period of time working with the machines and various implements which generate substantial noise. Exposure to excessive noise could be...

MANUFACTURE OF ABRASIVE GRINDING WHEEL USING SILICON CARBIDE ABRASIVE MATERIALS

ABSTRACT Abrasive materials are materials of extreme hardness that are used to shape other materials by a grinding or abrading action and they are used either as loose grains, as grinding wheels, or as coatings on cloth or paper. A grinding wheel is made of very small, sharp and hard silicon carbide abrasive particles or grits held together by strong porous bond. The manufacture of silicon carbide abrasives and grinding wheel in Nigeria has been severely impeded by the difficulty of identifyi...

Microstructural Study of Heat Treated Chromium Alloyed Grey Cast Iron

ABSTRACT This work investigated the effect of annealing, normalizing and quenching heat treatments on the microstructure of some chromium alloyed grey cast iron. Three sets of ten samples each having chromium contents of 0.5, 1.5 and 2.5% were heat treated above the upper critical temperature, to austenitizing temperatures (800oC, 850oC, 900oC) for one hour each and then annealed, normalized and water quenched. Metallographic analyses of the heat treated samples were done. The results showed ...

Effects of Selected Pre-treatment Methods on the Hydration Behaviour of Rattan-Cement Mixtures

Abstract The influence of calcium chloride (CaCl2 ), magnesium chloride (MgCl2), hot-and cold-water pre-treatments, and prolonged storage on the hydration behaviour of particles extracted from Calamus deerratus and Laccosperma secundiflorum rattan canes mixed with cement was investigated. While the untreated rattans inhibited cement setting, pre-treatments generally improved compatibility. The addition of chemical additives and aqueous pre-treatments enhanced the compatibility of the rattan-...

Preliminary Design of an Automated White Board Cleaner

ABSTRACT The work presented in this paper is on the preliminary design and fabrication of an automated whiteboard cleaner. The objective here in is to reduce the man-power involved in cleaning white boards after use. Though the use of smart boards is increasing, many institutions in the developed and developing world still make use of white boards. The Autodesk software was used for the CAD drawing and thereafter the design analyses and fabrication were done. The auto-board was designed to be...

PREDICTION OF CENTRAL LOCATION OF THE STATE WITH IRREGULAR BOUNDARY

ABSTRACT Mathematics has diverse applications as decision making tool. This study investigated the use of a proposed pure mathematical formulation (is. excluding human factor) for citing appropriately the location of political capital city an inhabited designated area.

Development of a Materials Requirements Planning (MRP) Software

ABSTRACT Lack of affordable, efficient, and user friendly inventory management tools, for adequate planning has been identified as a major cause of the high inventory cost in many Nigerian manufacturing firms. This study focuses on the development of a Materials Requirements Planning (MRP) that can be used by the local industries for inventory management in a job shop manufacturing environment. Four types of lotsizing techniques were analyzed and MRP algorithms developed for each of these lot...


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