Browsing by Author "Adeyemi, M.B."
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Item COMPUTER AIDED DESIGN OF RECTANGULAR AND CIRCULAR SHAPED ELECTRICAL FURNACES(Nigerian Journal of Technical Development (NJTD), 2003) Ajiboye, T. K.; Adeyemi, M.B.The software computer package developed was designed to analyse the heat generation and transfer for an electric furnace, and the selection of appropriate heater dimensions and material for the design of cylindrical and rectangular - shaped electric furnaces to meet specific operations at a specified desired temperature and to achieve certain performance level. Datas generated by the software "furnace" are graphed for heater material and can be used to determine electric furnace design for the cross-sectional dimensions and unit power consumption of the heater material. used at various electric heating power output for different desired operating temperatures not exceeding 1000oCItem Determination of temperature distribution in squeeze cast aluminium using the semi-empirical equations method(Journal of Materials Processing Technology, 2009) Aweda, J.O.; Adeyemi, M.B.The effects of parameters such as applied pressure, die pre-heat temperature, delay time and retention time of applied pressure on the temperature distributions within the casting have been considered. The results using this method were compared with those of experimental and heat transfer differential equations’ methods and found to be about 1.7% higher in value. The semi-empirical equations’ method can be used to predict the temperature distribution of other metals and alloys at any location, if the empirical equations relating the heat transfer coefficients to applied pressures and solidifying temperatures for their three stages of solidification are known.Item Effects of applied pressure and die temperature on the electrical conductivity of squeeze cast aluminium rods(Journal of Technological Development, 2007) Aweda, J.O.; Adeyemi, M.B.Item Effects of squeeze casting parameters on temperature distribution during casting of aluminium(Journal of Applied Science and Technology, 2009) Aweda, J.O.; Adeyemi, M.B.The effects of squeeze casting parameters, such as delay time and retention time of applied pressure and die preheating, on Temperature distribution during casting of aluminium were investigated. Increased applied Pressure and die pre-heating produced higher peak solidifying temperatures during squeeze casting of molten aluminium. Longer pressure retention time and shorter delay time gave higher peak solidifying temperature and product of excellent cast properties. The correlation between experimental measurements and computed numerical values of applied pressure, die heating temperature, delay times and retention times was very good.Item Experimental determination of heat transfer coefficients during squeeze cast of aluminium(Journal of Materials Processing Technology, 2009) Aweda, J.O.; Adeyemi, M.B.Heat transfer coefficients during squeeze cast of commercial aluminium were determined, by using the solidification temperature versus time curves obtained for varying applied pressures during squeeze casting process. The steel mould/cast aluminium metal interface temperatures versus times curve obtained through polynomial curves fitting and extrapolation was compared with the numerically obtained temperatures versus times curve. Interfacial heat transfer coefficients were determined experimentally from measured values of heating and cooling temperatures of steel mould and cast metal and compared with the numerically obtained values and found to be fairly close in values. The values of the heat transfer coefficients were found to increase with increase in applied pressures and to decrease with fall of solidifying temperatures corresponding to three distinct solidification stages namely, liquidus, liquidus–solidus and solidus stages. Below temperatures of 500 0C, the effect of the increase in heat transfer coefficients with applied pressure application becomes less significant and the drop in values of the heat transfer coefficients with solidification temperatures at any applied pressures remains fairly constant. The peak values of heat transfer coefficients obtained for as-cast (no pressure application) and squeeze cast (pressure application) of aluminium are 2975.14 and 3351.08 W/(m2K), respectively. Empirical equations, relating the interfacial heat transfer coefficients to the cast aluminium surface temperatures and applied pressures at three distinct temperature range intervals, were also derived and presented.