Browsing by Author "Kamoru Olufemi Oladosu"

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    Effect of bio-mineral oil blend quenchant on the mechanical properties of carburized mild-steel
    (Springer Nature, 2023) Maruf Yinka Kolawole; Suleman Adeniyi Aliyu; Sefiu Adekunle Bello; Kamoru Olufemi Oladosu; Ilesanmi Jonathan Owoeye
    In this study, the effect of bio-mineral oil blend quenchants on the mechanical proper ties of carburized mild steel was experimentally studied and reported. The tensile, hardness, impact, and microstructural test specimens were prepared in line with ASTM standards. Prepared specimens were then buried in a 50:50% ratio mixtures of egg shell/date-seed particulates as carburizing medium in a sealed packed cylindrical crucible. The carburization was then carried out in a muffle furnace at 950 oC for 3 h soaking time at 5 °C/min heating rate and thereafter quenched in different percentage blends of bio-mineral oils. Before the mechanical test and microstructural examination, amples were tempered at 200 oC for 1 h. Results from the experimental findings revealed that water and bio-mineral oil blend quenchants significantly influenced the mechanical properties and microstructure of carburized mild steel in varying degrees depending on the quenching media. Specimen quenched in 100% groundnut oil yielded the maximum yield tensile strength (805.43 MPa) and hardness at the surface edge (173.8 HV) equivalent to 106.7 and 87.66 percentage increment however, the best combination of mechanical properties (tensile strength 738.66 MPa, strain 17.12%, hardness 169.5 HV and impact strength 51.1 J) was obtained in the specimen quenched in 60/40% groundnut oil and SAE40 oil blends respectively. The enhancement in the mechanical property was due to the grain refinement in the microstructure of the bio-mineral oils quenched specimen. The 60/40 groundnut/SAE40 oil blend is therefore recommended for metallurgical heat treatment of mild steel for critical industrial applications
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    Optimum influence of kaolin additive and combustion characteristics of Albizia zygia wood-coconut-husk blends on ash yield
    (2021) Kamoru Olufemi Oladosu; Abass Olanrewaju Alade; Emmanuel Olaniyi Olafimihan; Olalekan Adebayo Olayemi; Tolulope Anthony Ojo
    Property of solid fuel is characterized based on the amount of ash yield after combustion. This study evaluates the influence of kaolin additives and combustion characteristics of Albizia zygia wood and coconut husk mixture on ash yield. D-Optimal Design under the Combined Methodology of Design Expert was employed to mix the solid fuel constituents alongside particle size in order to determine the ash yield of the mixture. The input parameters (wood, coconut husk, kaolin, and particle size) and output parameter (ash yield) of combustion process were also modeled using Artificial Neural Network (ANN). The 23 data points obtained from design of experiment were divided into training data and testing data sets in the relative proportion 9:1. A quadratic regression model (p<0.05) was obtained for the ash prediction. The optimal values established for the ash yield were wood (85 %), coconut husk (5.0 %), kaolin (10 %) and particle sizes (2.50 mm) respectively. The coefficient of determination (R2) obtained for the model is 0.8825 while the adjusted R2 is 0.8153. The ANN (R2) values for the model predictions were 0.939 for the training set and 0.926 for the testing set respectively. Thus, this study demonstrated that combustion of wood-coconut additive mixture could be efficient for energy generation.
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    Performance evaluation of combustion of palm kernel shell and coconut husk blend in a pilot-scale grate furnace
    (Elsevier, 2021-03-21) Kamoru Olufemi Oladosu; Akeem Amao Mustapha; Mondiu Olayinka Durowoju; Olusegun Ogunsanya
    Pollution resulting from the use of stereotypical fuels for energy generation has been a great menace to the air we breathe. Co-combustion of biomass fuels has proved effective against the deficiencies associated with the burning of individual biomass on its own. This study aimed at investigating the combustion of Palm Kernel Shell (PKS) and Coconut Husk (CH) blend in a grate furnace. The proximate and ultimate analyses of the mix of PKS and CH were determined using ASTM 3174-76 method. Four combustion tests were carried out with a 2 kW grate furnace, where the effects of temperature distribution, flue gas emissions (CO2, CO, and NO2), and combustion efficiency were measured. All the experimental tests were performed using varying primary-secondary air ratio of (40:60). The temperature distribution at different positions (H1, H2, H3, H4, and H5) in the combustion unit using PKS and CH blend (PKS-CH) ratio of 100:00, 70:30, 60:40, and 50:50 was measured. Temperature data were recorded for 50 minutes after a stable bed temperature of 248.7 °C was reached. The results indicated that the highest temperature immediately above the grate (H1) was 720.9 °C for 60:40 fuel proportions. A more significant temperature difference of 356.4 oC between the bed temperature and H1 temperature was recorded for 70:30 fuel proportions. The average deviation from temperatures at H1 to H5 at 50 minutes of the experiment was approximately 122 °C. For each co combustion fuel option, combustion efficiency increases with time following the same pattern as CO2 emission. The combustion efficiency was maximum (62.11%) at 70:30 PKS-CH ratios, which conversely showed a low CO emission of 302 ppm.