ADEFEMI O ADEODU | Afe Babalola University, Ado-Ekiti (original) (raw)

Papers by ADEFEMI O ADEODU

International Journal of Technology, 2016

International Journal of Materials Science and Applications, 2015

In this study, existing experimental vapour-liquid equilibrium (VLE) data covering a wide range o... more In this study, existing experimental vapour-liquid equilibrium (VLE) data covering a wide range of temperature, phase composition and pressure for ethane-n-butane-n-pentane was correlated using MATLAB (Matrix Laboratory) software. To increase the reliability of correlations, neural network was trained using existing vapour-liquid equilibrium data with the aid of Levenberg Marquardt algorithm. Network parameters are fine-tuned until the output generated by simulation are checked and observed to match with pre-determined experimental V L E data. It was found that there is high degree of coherence between the chosen targets from experimental data and predicted values. This confirms that correlations and predictions of V L E data using neural network is efficient and significant.

A mathematical model for pseudo one component adsorption on a fixed bed is developed. The model t... more A mathematical model for pseudo one component adsorption on a fixed bed is developed. The model takes into account of external and internal mass transfer resistances with non ideal plug flow behaviour. In the present study, the Langmuir equilibrium isotherm is used to represent liquid-solid equilibrium relationship. The model consists of a set of couple partial differential equations, and the differential equations representing the mass balances of both fluid and pore phases are solved by the implicit backward Euler finite difference method and compared with previous models reported in literature. The effects of various important and influencing parameters such as flow rate, particle radius and bed porosity in breakthrough curve are studied in detail. Hence, the proposed model is suitable and applicable to study the fixed bed adsorption column performance under isothermal condition.

Modeling of composite curing process is required prior to composite production as this would help... more Modeling of composite curing process is required prior to composite production as this would help in establishing correct production parameters thereby eliminating costly trial and error runs. Determining curing profile temperatures from experiment is a huge challenge which in itself is like re-inventing the wheel of trial and error, when mathematical models of physical, chemical and kinetic properties of the constituent materials could be used in modeling the cure situation to some degree of trust. This work has modeled two types of polymer based composite materials (Aluminum filled polyester and carbon-black filled polyester) representing polymer-metal and polymer-organic composites in order to predict the possible trends during microwave heating with regards to effect of heating rate on degree of cure of the composites.
The numerical models were constructed by taking into account the heat transferred by electromagnetic energy through the resin/filler mixture, as well as kinetic heat generated by cure reaction. The numerical solution of the mathematical models presented were discretized using forward finite differences of the Runge Kuta Method and finally solved using MATLAB® C programming language.
It was observed that Aluminum filled polyester composite responded faster to heat input- induced curing and as such was able to cure faster than polyester –carbon black composite which had much slower cure –heat input response. This implies that in the production process of polymer-organic composites, faster heating rate was necessary to input heat into the process as there was no heat of reaction released during the cure process whereas, polymer-metal composites release heat of reaction contributing to the quick transfer of heat into the metal components causing the metal components to behave as points of adhesion to the polymer matrix thereby necessitating a slower heating rate.

Correlation of vapour-liquid equilibrium data for hydrocarbon ternary system (ethane-n-pentane-n-... more Correlation of vapour-liquid equilibrium data for hydrocarbon ternary system (ethane-n-pentane-n-heptane) is
very useful in the design decision of separation process equipment such as separation columns, extractors etc.
The tool used for the correlation is MATLAB: a very reliable software with adequate neural network conditions
such as multi-layer feed forward, back propagation etc. A comprehensive Artificial Neural Network (A N N)
training and simulation model and list of pre-existing vapour-liquid equilibrium data for ethane-n-pentane-nheptane
system was employed for this work. Neural network was trained in MATLAB 7.10.0
environment.Several iterations were carried out on the ternary system until the performance goal was met. From
the analysis of the output result, regression and iteration graphs when compared with experimental data,
artificial neural network offered very small deviation from the target. This confirms conclusively that artificial
neural network is a consistent and reliable tool for predicting the vapour-liquid phase equilibrium for binary,
ternary and quaternary system. The knowledge of correlation also establishes the basic background required for
the understanding of the vapour-liquid phase behaviour of ternary systems which forms the basis of calculations
of distillation, extraction and absorption processes etc.

Despite rapid technological developments, heavy dynamic muscular work and manual material handlin... more Despite rapid technological developments, heavy dynamic muscular work and manual material handling will continue to be required for execution of tasks associated with various occupations. This study examined the physical strain experienced by brick layers and the applicability of heart rate indices for measuring physical strain in brick laying operations in south-western region of Nigeria with focus on the maximum energy expenditure and physiological workload during work. It further examined the effect on the workers’ productivity. The heart rate of ten brick layers were recorded continuously throughout the working day and applied to heart rate indices. The average working heart rate was 122.8 bt. Min-1, while the pre-work resting heart was 70.5 bt. Min-1. The average physical workload (%HRR) rate was 47.26, while the ratio of working heart rate to resting heart rate was 1.74. The average ratio of working heart rate to 50% level was 0.98. The workers had a mean estimated maximum aerobic capacity (Vo2max) of 47.77 ml kg-1 min-1. The results showed that an average bricklayer expended high energy which classified brick laying work as heavy work. The energy expenditure was estimated to be 9 Kcal. Min.-1, work bout (Tw) and maximum work bout (Tmax) were estimated to be 5.5 minutes and 6.3 minutes respectively. Rest period (R) = 6.2 minutes. This study shows that heart rate indices can be used as an effective means of determining the physiological strain of subjects in applied field situations. There is need to redesign the work content of the aforementioned occupation in order to prevent excessive strain on the workers, which in turn will increase productivity. Manual workers should be tested and evaluated for their physical work capacity for a particular task.

The aim of this research is to study selected health care workstations to establish the current p... more The aim of this research is to study selected health care workstations to establish the current practices with reference to the use of anthropometry. Also to re-design the work station, if necessary, in order to improve productivity, health safety and comfort of the patients and staffs using the work stations. Anthropometric dimensions of the patients in the examined health care system were used to design intensive care unit bed (ICU) and medical/surgical bed which can accommodate 5% - 95% of patients male and female. The work stations were examined and analyzed under the combination of different anthropometric parameters. The analysis of the results indicates some deficiencies in the design of the workstations based on the design parameters and standard values from the literatures. Based on the analysis of these results the patients and their care givers may likely be exposed to back pain, fatigue, poor blood circulation and other related diseases. For demonstration of the application of the extreme design approach, a hospital bed work station (health care system) has been re-designed as a real case. It is hope that the new design will contribute to improvement in productivity, health safety and comfort of the patients and staffs using the workstations. In the proposed extreme design approach, I suggest to every health care organization operating, before any decision on making or buying equipment, industrial engineers are to be consulted depending on the design factor, for proper guidance. Anthropometric dimensions of the workers should also be considered for any category of hospital bed design.

Purpose: The aim of this research is to study selected cyber cafe workstations to establish the c... more Purpose: The aim of this research is to study selected cyber cafe workstations to establish the current practices with reference to acoustic parameters. Also to re-design the work station, if necessary, in order to improve productivity, health safety and comfort of the operators in the work station.
Design/Methodology/Approach: Optimising the acoustic design of the work stations can be a complex task because of the number of design parameters that must be considered. This problem has been made much easier by designing for the permissible acoustic limit. Because of the nature of the selected work station, Nomograph estimation method was used. Finally Doppler Effect was used to calculate the permissible acoustic distances between the sources of noise and operators in the work station.
Finding: The work station have been examined under the combination of different acoustic parameters. The analysis of the results indicates some deficiencies in the design of the workstation based on the design parameters and standard values from the literatures. Based on the analysis of these results the operators and their clients may likely be exposed to fatigue, work stress and other related diseases.
Research Limitation/Implication: For demonstration of the application of the permissible acoustic design approach, a computer operator work station (Open Plan Cyber café) has been re-designed as a real case. The new design it is hoped will contribute to improvement in productivity, health safety and comfort of the operators in the workstation
Practical Implication: The proposed permissible acoustic design approach encourages Industrial/Design Engineers that standard permissible acoustic limit must be strictly followed, for the safety of the workers and site of computer operator work station should be in a place of reasonable serenity for maximum concentration.
Originality/Value: Reports reveal that acoustic design of an open plan computer operator work station has never been done using multiple acoustic design parameters. The acoustic level of the computer operator work station was re-designed to conform to the standard permissible acoustic level using multiple acoustic design parameters.

In the process or manufacturing industry, raw materials and products need to be transported from ... more In the process or manufacturing industry, raw materials and products need to be transported from one manufacturing stage to another. Material handling equipment are designed such that they facilitate easy, cheap, fast and safe loading and unloading with least human interference. For instance, belt conveyor system can be employed for easy handling of materials beyond human capacity in terms of weight and height. This paper discusses the design calculations and considerations of belt conveyor system for limestone using 3 rolls idlers, in terms of size, length, capacity and speed, roller diameter, power and tension, idler spacing, type of drive unit, diameter, location and arrangement of pulley, angle and axis of rotation, control mode, intended application, product to be handled as well as its maximum loading capacity in order ensure fast, continuous and efficient movement of crushed limestone while avoiding halt or fatalities during loading and unloading. The successful completion of this research work has generated design data for industrial uses in the development of an automated belt conveyor system which is fast, safe and efficient.

The demand for biodiesel processor is expanding as a result of increasing acceptance of biodiesel... more The demand for biodiesel processor is expanding as a result of increasing acceptance of biodiesel as a viable
alternative fuel for diesel engines because of its renewable source, high biodegradability and reduced harmful
exhaust emissions. This works examines the design of small scale biodiesel processor capable of transesterifying
20 litres of biodiesel per batch from biodiesel feedstock at minimum cost and near perfect purity of biodiesel to
reduce treatment after biodiesel production. Basic design requirements such as: stir speed, maximum reaction
temperature, mass and energy balance and heat requirements as well as drive and control system were fixed.
Performance evaluation of the processor was carried out using vegetable oil and results obtained are within the
American Society for Testing and Materials (ASTM) specification for biodiesel.

A caustic potash processor capable of processing 30, 000 tons of caustic potash per anum from coc... more A caustic potash processor capable of processing 30, 000 tons of caustic potash per anum from cocoa pod husk was designed.
It essentially consist of storage tank, fluidized bed dryer, rotary dryer operating at a temperature of 1100C for drying the feed, roll
crusher which reduces the husks into smaller sizes and a furnace operated an elevated temperature to ensure proper ashing. The
processor also consists of a reactor where leaching: the major process involved in the production of caustic potash from cocoa pod husk
takes place. The reactor is lagged and heated internally after which an evaporator fired by a boiler is employed to concentrate the KOH
solution. The water vapour leaving the evaporator condenses in the condenser and is recycled to the boiler. A detailed energy and
material balance as well as analysis of process control system and instrumentation was also carried out to keep process variable within
known safe operating limits in order to achieve the designed production rate and maintain the caustic potash within the desired
specification at an optimal production cost.

Engineering and technology is key to sustainable development. It has become imperative for third ... more Engineering and technology is key to sustainable development. It has become imperative for third world yearning for sustainability and economic prosperity to build indigenous capacity as a driving force for technological breakthrough in vital sectors. In this work, key sectors such as energy, power, infrastructure, agriculture, manufacturing, ICT etc. that plays pivotal role in enhancing sustainability were examined with their impact or otherwise on sustainable development. Also, the road to sustainability demands deviations from conventional source of energy and transition to renewable sources so as to reduce the threat of fast depletion of fossil fuel as well as minimizing safety, economic and environmental challenges associated with fossil fuel. This work also examines detailed design of large scale biodiesel processing plant and the prospects of biodiesel as a green and safe alternative source of energy for powering diesel engines. Biodiesel a clean burning alternative to fossil fuel, produced from domestic or renewable agricultural resources is a product of transesterification between triglycerides and alcohol and has similar properties to fossil diesel hence can be used in diesel engine of cars and buses with or without modifications. An intensive and cost-effective process configuration which involves integration of all operations and steps involved in the production of biodiesel into one single unit was designed. This will serve as a model for developing countries striving for energy sustainability.

The aim of this research is to study selected cyber cafe workstations to establish the current pr... more The aim of this research is to study selected cyber cafe workstations to establish the current practices with reference to the use of anthropometry. Also to re-design the work station, if necessary, in order to improve productivity, health safety and comfort of the operators in the work station.

International Journal of Technology, 2016

International Journal of Materials Science and Applications, 2015