Oluwole Ojo - Academia.edu (original) (raw)

Papers by Oluwole Ojo

Journal of The Institution of Engineers (India): Series D, 2022

The physicomechanical properties of bio-based sawdust-cow horn-coconut husk particleboards were d... more The physicomechanical properties of bio-based sawdust-cow horn-coconut husk particleboards were determined in the present study. The particleboards were first produced using urea formaldehyde as a binder and thereafter characterized in terms of water absorption, thickness swelling, modulus of rupture (MOR), and modulus of elasticity (MOE). The thickness swelling and water absorption properties were determined at 24 and 48 h. The results of the thickness swelling at 24 and 48 h showed that boards exhibited average values of 0.55 to 1.25% and 1.40 to 2.57%, respectively, while the water absorption at 24 and 48 h gave a result of 0.71 to 1.42% and 1.08 to 2.74%, respectively. The boards also exhibited MOR with average values of 0.54 to 0.98 MPa and 12.97 to 32.37 MPa for MOE. The result shows that both water absorption and thickness swelling after 24 and 48 h decreases with an increase in the blends of sawdust, cow horn, and coconut husk. The physical properties (water absorption, thickness swelling) and mechanical properties (MOR and MOE) meet international standards confirming the strength of the manufactured boards.

Journal of the institution of engineers (India) series D, Mar 31, 2022

OALib

The paper presents the development of a manually operated hydraulic press which encompasses the d... more The paper presents the development of a manually operated hydraulic press which encompasses the design, fabrication and performance evaluation of the press. The components parts of the machine were designed using various design equations. The design results were used to select materials for various components. The detailed drawing of the developed machine was done using Pro E software. In fabricating the machine, mild steel was used as the locally sourced material. The use of mild steel is due to the fact that its strength, rigidity and machinability falls within the design specifications. Some components of the machine developed include; the frame, cylinder mounting table, press pin, working table/bed, hydraulic tank, and hand lever. Some of the bought out parts include: ram assembly, pressure hose, pressure indicator and hydraulic pump. In evaluating the performance of the machine developed, mild steel plate of length 220 mm, breadth 70 mm and thickness 20 mm was put on the machine working table. This piece of material was bent after pressing the hand lever. The pressure at which bending took place was read to be 50 bar as indicated on the pressure gauge. The machine developed was also used to press a sleeve of internal diameter of 85 mm and external diameter of 89 mm into the cylinder of an engine block at a pressure of 15 bar. The cost of the machine as at the time of fabrication is N398,440.

Journal of Materials Engineering and Performance, 2021

Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2021

Analecta Technica Szegedinensia, 2021

Indiscriminate disposal of beverage cans as waste poses a great threat to the environment, causin... more Indiscriminate disposal of beverage cans as waste poses a great threat to the environment, causing flooding, landfill, and blockage of drainages, leading to land pollution and sometimes accident. Hence, there is a need to design a system capable of converting these wastes into usable products. In this study, a simulation-based analytical design for aluminum recycling processing plant was carried out to ascertain the efficiency and reliability of the design before fabrication using finite element analysis (FEA) approach. The simulation results revealed a lesser maximum stress of 6.323 MPa for the furnace outer casing under the action of load with a displacement of 0.0795 mm. The stress of the machine components is less than the yield strength of the selected materials, making the machine fit and workable. The analytical results agree with the numerical analysis; hence the conceptual design is fit for fabrication based on the design analysis and evaluation. After the design analysis a...

BioEnergy Research, 2020

Torrefaction of biomass materials has received a tremendous attention over the years due to its a... more Torrefaction of biomass materials has received a tremendous attention over the years due to its ability to produce a high-grade solid biofuel with enhanced durability, excellent grindability, higher bulk density and calorific value, and greater energy density, as compared to the original untreated biomass material. It is a mild pyrolysis treatment technology under inert atmosphere which can improve the chemical and physical properties of raw biomass through the elimination of oxygen, reduction of moisture content, and change of chemical compositions. When raw biomass is mildly pyrolyzed in a default-oxygen or N 2 atmosphere at moderate temperatures, the properties of raw biomass including low calorific value, hydrogen-carbon ratio, hygroscopicity, and grindability can be significantly enhanced. In the present review, the operating mechanism of different torrefaction processes including wet, dry, and ionic-liquid-assisted torrefaction is analyzed and discussed. More importantly, the reactor design for commercialization purpose, reaction kinetics and mechanism, economics, and sustainability of biomass torrefaction is discussed in detail. This review is extended to the torrefaction of agro-residue biomass since torrefied agro-residue-based pellets can be produced from agro-residues. The various technological applications of biomass torrefaction are also reviewed and the prospects in ensuring the continuous production of high-grade fuels are summarized.

Energy, Ecology and Environment, 2020

Briquetting process offers unique advantages such as uniformity in briquette size and shape, easy... more Briquetting process offers unique advantages such as uniformity in briquette size and shape, easy storage and transportation, thanks to the influence of binders which ensures good bonding and combustion performance. Recently, much has been discussed about the briquettes-binders system and the influence of binders on the resulting physical and combustion properties of briquettes. However, the present knowledge is insufficient on the binderless briquetting technology which is commonly used for producing lignite briquettes, as well as the resulting properties and beneficial effects when compared to briquettes produced with binders. The present review discusses the binderless briquetting technology in detail and its influence on the combustion and mechanical properties of the lignite briquettes. To a large extent, some properties of the lignite like hardness, surface structure, plasticity and elasticity can influence the binderless briquetting process. Reducing the plasticity or increasing the elasticity of lignite is advantageous to binderless briquetting. The various forms/theorems of binderless technology including capillary, adhesion, bituminous and humic acid, colloidal, denser water and cation membrane theorems were discussed. Under binderless briquetting system, the influence of briquetting parameters (temperature and pressure) and lignite coal properties (particle size distribution, moisture content, and hydrogen bonding) on briquette strength was extensively analyzed and discussed. This review study is concluded by presenting a comprehensive overview on the bonding mechanisms and several points of interest for future studies as regards the binderless technology for producing lignite briquettes.

BioEnergy Research, 2019

Briquettes are widely used as a renewable energy material for solving the problem of dependency a... more Briquettes are widely used as a renewable energy material for solving the problem of dependency and over-consumption of wood fuel as a source of energy for human use. However, their performance depends on the types and nature of binders used during the preparation and densification process. Most of the performance-related problems such as low yield and energy content can be significantly improved with the use of binders in right proportions. This review discusses the state-of-the-art of fuel briquettes and the influence of binder’s properties on the combustion characteristics, energy content, mechanical durability, and density of fuel briquettes. The compatibility between the binders and the fuel briquettes to obtain a better yield is also discussed with the resulting mechanical and combustion properties. The mechanical durability of fuel briquettes can be improved by reducing the content of lignin, fat, and other extractives in the binder, as well as improving the binder’s variables such as the particle size, texture, and quantity. By using binders mixed with phosphorus-based additives such as Ca(H2PO4)2 and NH4H2PO4, the combustion rate of fuel briquettes can be enhanced and the pollutant emissions during the combustion process can be reduced to the minimum. In addition, the higher the binders’ compacting pressure and processing temperature, the higher the density and energy content per unit volume of fuel briquettes.

Journal of Scientific Research and Reports, 2016

This study aimed to investigate the effect of sweet potato pectin concentration, pH and salt on t... more This study aimed to investigate the effect of sweet potato pectin concentration, pH and salt on the stability of whey protein isolate (WPI)-stabilized oil-in-water emulsion. Primary emulsion stabilized by WPI was produced by homogenization using Microfluidizer. Sweet potato pectin was added to the primary emulsion at different concentrations (0-1.2 wt %) to produce multilayer emulsion. Particle size, zeta-potential and creaming index of the multilayer emulsion was analysed at different pectin concentrations (0-1.2 wt %), pH (3-7) and salt concentrations (0-400 mM). Decreasing of zeta-potential (+2.38 to-14.8 mV) showed the adsorption of pectin layer around the emulsion droplets. Creaming index was the lowest (3.64%) at the highest pectin concentration (1.2 wt%) which showed great stability against creaming. Multilayer emulsion showed better stability at high pectin concentration and has better stability at a wider range of salt concentration compared to primary emulsion. Pectin addition largely improved the stability of emulsion especially at pH 4 and 5. Multilayer emulsion prepared using sweet potato pectin can be utilized to produce food emulsion with good stability against environmental stresses (pH and salt content).

Ogun river basin, located in southwestern Nigeria, is one of the major river basins under the man... more Ogun river basin, located in southwestern Nigeria, is one of the major river basins under the management of Ogun-Oshun River Basin Development Authority. Different water uses, including domestic, commercial, industrial and agricultural take place within the basin. As population and economic activities increase, water demand also increases, which makes it imperative for water resources planners to take into account the consequent water demand challenges. In this study, Water Evaluation and Planning (WEAP) model is used to evaluate the impacts of possible water demands on the water resources of Ogun river basin up to the year 2020. Two scenarios were simulated: the first concerns the previous and current accounts of water demand in the basin from 2006 to 2011 while the second simulates the future water demand in the basin from 2012 to 2020. The water demand utilization, unmet demand, demand site coverage, supply delivered, stream flows and water storage were analysed for each scenario...