Browsing by Author "Olawore A. S"

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    Effects of Cold Extrusion on the Mechanical Properties of Scrapped Copper Coil
    (Sumy State University, Ukraine, 2021-12-10) Olawore A. S; Oladosu K. O; Sadiq T. O; Ahmed M; Adesope W. A
    The recycling of copper coil into finished products via sand casting with subsequent cold extrusion was investigated. This paper examined the effects of cold extrusion on the mechanical properties of the scrapped copper coil using a locally manufactured extruder with a conventional face die. The mechanical properties tested on the extrudates are limited to hardness, tensile, and compressive strength. The results reveal that the hardness of extruded copper of 11.10 mm and 11.45 mm improved significantly by 39 % and 41 %, respectively, compared with respective non-extruded copper. The compressive and tensile strength increases by 42 % and 22 %, respectively, for 11.10 mm extruded copper compared with the corresponding non-extruded copper. Also, the elongation of the extruded copper of 11.10 mm and 11.45 mm increases by 33 % and 34 %, respectively. It was deduced that the extruded copper is more ductile than the non-extruded copper. The micrograph reveals that grains in non-extruded copper are relatively coarse and nonuniform with voids, but fine and relatively uniform grains are obtained in extruded copper. The grains are refined during cold extrusion, and voids and islocations are reduced significantly
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    Investigating impacts of ammonium phosphate on ash yield from co-combustion of sugarcane bagasse and banana leaves
    (Faculty of Engineering and Technology, LAUTECH, Ogbomosho, 2024) Oladosu K. O.; Olawore A. S; Ponle E. A; Adeniran I. S; Oderinde J. O
    High ash yield from the co-combustion of sugarcane bagasse (SGB) and banana leaves (BL) presents significant challenges for efficient biomass combustion in a grate furnace. This study aimed to explore the potential of ammonium phosphate (NH4H2PO4) as an additive to reduce ash yield during the co-combustion of SGB and BL in a muffle furnace. An I-Optimal design of the Combined Methodology (OCD), embedded in Design Expert (version 13.0.5), was employed to design experiments for optimizing ash yield, considering various particle sizes, additive concentrations, and temperatures. The NH4H2PO4 additive was most effective at concentrations between 4% and 7%, beyond which ash yields increased significantly. The optimal composition was determined to be 75% SGB, 20% BL, and 5% NH4H2PO4 at 950°C, resulting in the lowest ash yield of 6.46% and HHV of 22.4MJ/kg. The presence of NH4H2PO4 in the biomass mixture significantly reduced ash yield. The input and output relationship of the biomass additive mixture was modeled using OCD, resulting in R² and adjusted R² values of 0.9825 and 0.9099, respectively, indicating accurate determination of the model coefficients. This study demonstrates that ammonium phosphate additive has great potential in mitigating ash-related problems in biomass combustion.