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Optimization Of Clay-Bonded Graphite Crucible Using D-Optimal Design Under Mixture Methodology
(2019-07-07) Olurotimi M. Adeoti; Olurotimi A. DahunsiA.; Olayinka O. Awopetu; Kamoru O. Oladosu; Omolayo M. Ikumapay
The aim of this study is to optimize clay-bonded graphite crucible from the mixture of clay and graphite and selected additives (MgO and SiC) using D-optimal under the Mixture Methodology of the Design-Expert version 6.08. The samples were dried forced under the normal atmospheric condition for two weeks and were oven dried at 100oC and later fired in a muffle furnace at 11000C. The samples were subjected to the following mechanical test bulk density, linear firing shrinkage, and apparent porosity. The results obtained shows that experimental Run 7 gave the least value of bulk density (1.80) with Clay (80 %), Graphite (10 %) and MgO and SiC (10 %) respectively but Run 9 gave the lowest apparent porosity with Clay (70 %), graphite (10 %) [MgO and SiC (10 %)]. Further investigation conducted indicated that Run 13 with percentage composition of 80 % clay, 10 % graphite, 5 % MgO and 5 % SiC gave the highest value of the bulk density of 2.91 and the least value of linear shrinkage of 2.15 and the apparent porosity value of 28.20. These values fall within the experimental range given by literature. Though by natural intuition and from the literature survey, run 14 would have been selected but based on values obtained, run 13 was confirmed and concluded upon to have a better composition as a result of the computer analysis using design expert considering the values obtained from the selected mechanical test
DEVELOPMENT OF COMPUTER PROGRAM FOR DESIGN OF A SCALABLE COMBUSTION FURNACE USING PALM KERNEL SHELL AS HEAT SOURCE
(Faculty of Engineering Hunedoara, Romania, 2017-03-01) .K.O. OLADOSU; B. KAREEM; B.O. AKINNULI; T.B. ASAFA
Steam boiler is an integral and important component of steam turbine used for electricity generation. Its design is however complex, time consuming and prone to errors if done manually. In this study, we report the application of computer based approach to design palm kernel shell combusting furnace for generating a desired amount of electricity. Using backward calculation approach, standard design equations were used to size furnace and its components. The equations were coded and solved using C-Sharp programming language. The results showed that to generate 5 kW of electricity from palm kernel shell; 5.5 kW turbines, 3.6 m super heater, 3.2 m riser, furnace of 1.432 m height and 0.45 m3 volume were required having considered power loss due to friction and others. While these results are in good agreement with those calculated manually, human errors are virtually eliminated. In addition, calculations and drafting time were reduced from 5 hrs 47 mins when done manually to about 4 mins when the developed code was used. This code can be used to size boiler for any desired power output.
OPTIMIZATION OF HHV AND ENERGY YIELD FROM TORREFACTION OF ALBIZIA ZYGIA WOOD- CALCIUM HYDROGEN PHOSPHATE CATALYST BLENDS USING OPTIMAL COMBINED DESIGN
(University of Novi Sad, Faculty of Technology, 2022-06-20) Kamoru Olufemi OLADOSU; Ayodeji Sulaiman OLAWORE; Abass Olanrewaju ALADE; Maruf Yinka KOLAWOLE
The over-reliance on fossil fuels as a primary source of energy is partly responsible for the in crease in carbon dioxide (CO2), depletion of the ozone layer, and general environmental pollution. In this study, torrefaction of Albizia zygia wood-calcium hydrogen phosphate (CaHPO4) catalyst blends was carried out in a tubular furnace to examine the impacts of temperature, time, and particle size on higher heating value (HHV) and energy yield (EY). Albizia zygia wood was obtained at an industrial sawmill junkyard nearby Kwara State University, dried, crushed, and sieved into 1 – 3 mm particle size. Optimal Combined Design (OCD) was employed for the design, modelling, and optimization of HHV and EY under the ranges of selected temperature (200 – 300 °C), residence time (15 – 30 min), and particle size (1 – 3 mm) in an inert environment tubular furnace. The results of the analysis indicated that the temperature of 245 °C, time of 22 min, and size of the particle 3 mm yielded a maximum HHV of 19.59 MJ/Kg and EY of 76.37% respectively. Also, the addition of catalyst (CaHPO4) at 10% reduced the ash content but enhanced the fixed carbon content of the biochar. The mathematical models for the HHV and EY for the torrefaction using the OCD imply an excellent fit with R2 of 0.92 and 0.96, respectively. The prediction accuracy indicates that OCD can be deployed for the accurate prediction of HHV and EY in torrified biomass.
Computer Aided Design and Drafting of Helical Gears
(2012) Akinnuli B. O; Ogedengbe T. I; Oladosu K. O
An interactive user friendly low cost software called “CADDgear” was developed in this study to facilitate the design and drafting of helical and spur gears thereby generating reliable data for use in manufacturing process. The software was developed, using JAVA programming language, as a tool for determining the design parameters and producing accurate and efficient 3D (three dimensional) and 2D (two dimensional) detail working drawings of helical gears. The study considered the existing approaches in use for the design of helical gears and then established a design analysis procedure for helical gear design. The established procedure was implemented through the developed software so that a substantial saving in term of time and cost of production of the design is obtained. The outcome of this research would enhance the designer’s productivity by reducing the time required to synthesis, analyze and document helical gear design. This would permit a thorough analysis of a large number of design alternatives. Results generated by the software shows very good agreement with that obtained through manual calculation using the established procedure. It was observed that the developed software successfully increase productivity over manual gear design and drafting by approximately thirty-four times in term of the time required for the design
Mechanical Properties of Hot Rolled Ribbed and Plain Steel Rods
(University of Port Harcourt, 2021) 1SHUAIB, MA; AJAO, KR; *OLADOSU, KO
This study focuses on microstructure and mechanical behaviour of 3PS (Semi-killed mild steel) hot rolled ribbed and plain carbon steel. 3PS billet steel samples and hot rolled ribbed and plain steel rods of different heat umbers and profiles were characterized for its chemical composition, microstructure, and tensile behaviour. The composition analysis of 5 (five) 3PS billet samples shows that there was no appreciable variation in chemical composition of the hot-rolled plain and ribbed steel rods. The microstructures of as-received steel billet (3PS) examination revealed large grains of ferrite and pearlite while those of hot-rolled 3 PS mild steel samples of different heat numbers contain smaller grains of ferrite and some amount of pearlite. The results also indicated that yield and ultimate tensile strength reach maximum values (492 and 361 N/mm2) at 0.31% elongation for heat number 43 while maximum values for heat number 56 (478 and 362 N/mm2) at 0.33 % respectively. The ribbed steel rod of the same diameter as plain steel exhibit slightly better mechanical properties with higher values of yield and ultimate tensile strength. There is consistency in the chemical composition of the as-received billet and the hot rolled products.

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