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Articles by S.B. Adeyemo
Total Records ( 6 ) for S.B. Adeyemo
  S.B. Adeyemo and A.A. Adeyanju
  The effects of media material on biogas yield was investigated using poultry (layers) drop (PD) in a laboratory and anaerobic digester. Cassava peels (CP) and obeche wood (Triplochiton Scleroxylon) were used as media material. The quantities of media material used in this investigation were 0% CP 25% CP without obeche wood, 50% CP seeded with obeche wood, 100% CP (macerated) and 100% CP (unmacerated). The waste water ratio (slurry) used in this study was 1:3. The volume of biogas produced ranged from 90-2590 cm3 with different concentration of cassava peels and obeche wood in poultry drops. Fifty percent (50% w/w) of the Cassava peels seeded with obeche wood in poultry dropping yielded the highest volume of biogas (2590 cm3). The wood medium used (obeche) exhibited good medium characteristics in accelerating biogas yield.
  S.B. Adeyemo and O.F. Adeoye
  The performance of two discrete solar heating systems have been studied. One of the collector systems was designed to track the sun while the other was to remain stationary. A 30 day performance test for both collectors was carried out on clear days and a semi-cloudy days. The study revealed that for the experimental period and under the same conditions the tracking and non-tracking collector indicated mean values of the useful heat gain of 290 and 220 W m 2, overall heat loss coefficient of the collectors being 2.5 and 5.8W m 2K, while the mean thermal efficiencies of the collectors were 56 and 43%, respectively.
  S.B. Adeyemo and A.O. Odukwe
  This study looked at energy conservation as being concerned with ways to reduce energy demand, but yet achieve the same objectives, thus serving as a veritable means of achieving energy stability. The trends of several energy forecasts with a projected annual growth rate from 2.5-4% had been an indication for the application of energy conservation measures. This study takes a look at the national energy outlook of a country like Nigeria vis-a-vis the world energy outlook and presented several energy conservation opportunities to cause energy savings and identified about 6 major areas through which energy conservation measures can effectively cause some savings in energy and allow for its stability. Such areas of focus for application of energy conservation measures include: Manufacturing/industrial set-up, office and residential buildings, transportation, power generation and distribution, energy conservation through waste control etc. Finally, various measures have been recommended among which were energy use in heating and ventilating equipment, lighting, electrically operated machines, design for energy efficient buildings etc.
  A.J. Alawode and S.B. Adeyemo
  The corrosion rates and tensile properties of mild steel rods, quenched in water and tempered within temperature range of 200-600C at an interval of 100C, were experimentally investigated and presented. Sodium chloride solution containing approximately 3.5% weight of solute, prepared from 97.5% table salt, was used as the corrosive medium. Some as-quenched and tempered specimens were retained as non-corroded specimens while other identical specimens were totally immersed in seawater medium for 90 uninterrupted days. Corrosion in saltwater was found to have adverse effects on both the strength and ductility of the specimens; the ultimate tensile strength and percentage elongation at fracture of as-quenched specimen were found to decrease from 523.44-498.68 MPa and from 12.007.14%, respectively due to corrosion in saltwater. Also, increase in tempering temperature was observed to have reduction effects on strength but increasing effect on ductility; the ultimate tensile strength and percentage elongation at fracture of as-quenched specimen were observed to vary from 523.440-470.39 MPa and from 12.0015.28%, respectively due to tempering at 400C for 45 min. Weight loss of test specimens was measured to evaluate the corrosion rate. However, the susceptibility of the specimens to corrosion is reduced with increase in tempering temperature. Remarkable resistance to corrosion was observed within temperature range of 300600C; the corrosion rate of as-quenched specimen decreases from 31.43-17.85 mils year 1 due to tempering at 400C for 45 min. The percentages of resilience retained after tempering are found to be closer in values to the percentage corrosion rates of identical specimens. This shows corrosion rate to be a function of the level of resilience retained in the specimens.
  I.O. Ogunleye , S.B. Adeyemo and M.B. Adeyemi
  The effects of moisture contents on the physical, thermal and drying properties of granular cassava particles were determined experimentally. These properties are physical properties such as loose particle density, porosity, voidage fraction and particle size distributions, thermal properties such as specific heat capacity and thermal conductivity and drying properties such as moisture ratio, drying rate versus free moisture and diffusion coefficients with moisture contents. The methods used for the experiments include gravimetric analysis, sieve analysis, calorimetric and oven drying. The empirical equations developed for loose particle density, porosity, voidage fraction, specific heat capacity, thermal conductivity are found to be linear functions of the percentage moisture contents. All these properties are found to increase with the percentages moisture contents, except the specific heat capacity which decreases with increase in the percent moisture content. The diffusion coefficients obtained from the isothermal drying curves are expressed empirically as a function of drying temperatures and are found to be non linear.
  A.J. Alawode and S.B. Adeyemo
  The impacts of foundry sand sizes and mould preheat temperatures of range 30-200C on the mechanical properties of cast aluminium rods were experimentally investigated and presented. At the same mould preheat temperature, cast specimens from fine sand mould exhibited highest tensile, impact and torsional properties with better hardness values. Also, preheating as-prepared fine sand mould to isothermal temperatures of 100 and 200C for 1 h caused the percentage elongation of its cast specimen to increase from 9.8-11.8 and 13.5, respectively impact energy increased by 13.3 and 33.3%, respectively from initial value of 15 J, while its hardness, tensile strength and ultimate shear strength having respective initial values of 61.8 HRB, 144.6 MPa and 2.050 GPa correspondingly decreased by 11.5, 13.0 and 9.76% due to mould preheat to 200C. Hence, for optimal mechanical properties, fine sand is found appropriate and preheating sand mould to about 200C for some period in the furnace is considered adequate in effecting small changes in the mechanical properties of cast specimens, while avoiding crack formation in the sand mould due to excessive heat accumulation.
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