LAUTECH Journal of Engineering and Technology http://laujet.com/index.php/laujet <p>LAUTECH Journal of Engineering and Technology (LAUJET) is a leading internationally referred journal in the fields of science, engineering and technology. It is a journal founded by academicians, educationists with substantive experience in industry. The journal is an online open access journal with a yearly print version of its volumes/issues made available to interested persons/institutions. The basic aim of the journal is to promote innovative ideas in fields relating to the sciences, engineering and technology. The basic notion of having a wide area of focus is to encourage multidisciplinary research efforts and seamless integration of diverse ideas that might be gleaned from the papers published in the journal.</p> <p>&nbsp;</p> Faculty of Engineering and Technology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria en-US LAUTECH Journal of Engineering and Technology 1597-0000 MODELING THE AIR FLOW RESISTANCE OF BULK SPONGE GOURD (LUFFA CYLINDRICA) SEEDS http://laujet.com/index.php/laujet/article/view/226 <p>The knowledge of airflow resistant of agricultural materials is important to the design of drying and aeration systems and enhances proper fan selection for these systems. This study investigated the pressure drop across a bed of sponge gourd (Luffa cylindrica) seeds at moisture contents in the range of 9.98 to 16.5% (w.b), airflow rate of 0.11 to 0.32 m<sup>3</sup>s<sup>-1</sup>m<sup>-2</sup>, material bed depth (0.2 to 0.8 m) and bulk density (loose, medium, and high). Pressure drop data was fitted to three common airflow resistance models (Shedd’s, Hukill and Ives’s, and Ergun’s models). An empirical equation comprised bulk density, moisture content, and airflow rate was also developed to predict the pressure drop of sponge gourd seeds. Results obtained indicated that the airflow resistance of sponge gourd seeds increased with increase in airflow rate, bed depth but decreased with moisture content. Increased bulk density resulting from loose to densely filled resulted in an increase in resistance to airflow. Shedd model was selected to be the best for predicting pressure drop across bulk sponge gourd seeds for all the condition studied due to its high value for Coefficient of Determination (R<sup>2</sup>) of 0.996 and a low root mean square error value (0.0279) compared to other models. The empirical equation developed predicted well the pressure drop with R<sup>2</sup> and RMSE values of 0.950 and 0.264 respectively.</p> O. U. Dairo A. Oyenusi A. A. Aderinlewo O. R. Adetunji E. A. Adeleke ##submission.copyrightStatement## 2018-03-19 2018-03-19 12 2 1 9 WASTE TO WEALTH - CONVERSION OF POULTRY LITTER FROM RAW FORM TO PELLETED ORGANIC FERTILIZER http://laujet.com/index.php/laujet/article/view/227 <p>A review of the use of pelletized poultry litter for creation of wealth through use as organic fertilizer was done, using information from literature and data from field observation. Poultry wastes, which are a menace to the environment, are sources of wealth creation, especially for organic farming. There is an abundance of poultry wastes in Nigeria, as about 932.5 metric tonnes of poultry manure is produced annually from the well-established poultry houses which keep expanding at the rate of 8% per year. Also, global trend is shifting to organic fertilizer as the use of chemical fertilizer over the years has destroyed our soil. Organic fertilizer has much organic content, which can rejuvenate the already destroyed soil. Not only that, organic fertilizer is safe for human health. Pelletized poultry litter would compete successfully as a soil conditioner or soil amendment. It would also be priced competitively, as it provides a unique mixture of nutrients and conditioning properties. Consequently, there is more poultry farming profitability, efficient resources utilization and conservation of environment due to waste management.</p> M. O. Kolade B. A. Adewumi O. U. Dairo C. O. Adejuyigbe O. A. Adejumo ##submission.copyrightStatement## 2018-03-19 2018-03-19 12 2 10 15 REVIEW OF THE AERODYNAMICS AND PARTICLE DYNAMICS FOR COFFEE SEPARATION http://laujet.com/index.php/laujet/article/view/229 <p>The importance of agriculture in mitigating the effects of overdependence on crude oil export to boost Nigeria economy cannot be overemphasized. Coffee is an important foreign exchange earner and Nigeria has vast potential to resuscitate production, processing and export. An important first step to earn a premium on coffee is to ensure quality post-harvest practices which include cleaning sorting and classification which at present is either lacking or inadequate, given the poor price coffee of Nigeria origin currently attracts. This study reviewed a few notable research works on the aerodynamic of coffee and other notable works on its particle dynamics and related studies in agriculture. The subject of particle dynamics for coffee separation was lacking, hence the need to undertake detailed study on the subject the outcome of which would be to obtain particle trajectories of coffee beans and components as a basis to select the dimensions of a cross flow system to classify coffee beans which is a major requirement in coffee trade worldwide.</p> A. Mofolasayo B. Adewumi E. Ajisegiri A. Agboola ##submission.copyrightStatement## 2017-03-19 2017-03-19 12 2 16 20 ANALYSES OF THE MOTION OF A PIPE CONVEYING A FLUID WITH AN INVISCID FLOW http://laujet.com/index.php/laujet/article/view/230 <p>The transverse motion of a fluid-conveying pipe with an inviscid flow was considered in this work. A comprehensive governing differential equation for the transverse vibration of a fluid-conveying pipe system was derived according to the principles of conservation of mass and momentum of fluid in a pipe. The derived equation was then analyzed and solved for an inviscid flow using the integral Fourier-Laplace Transformations. Effect of some flow parameters like mass ratios, damping coefficient and velocity of flow were investigated. Results revealed that the first natural frequency increased with increase in mass ratio for low velocities and reverse was the case for relatively high velocities. First natural frequency also increased with damping coefficients. Similar profiles can be observed about the second natural frequency. The response increased with increase in velocity. The study concluded that damping coefficient and mass ratio played significant roles in the motion of a fluid-conveying pipe with an inviscid flow.</p> S. I. Kuye N. O. Adekunle C. N. Nwaokocha S. O. Gi Wa ##submission.copyrightStatement## 2018-03-19 2018-03-19 12 2 21 32 EFFECTS OF REPLACING INCANDESCENT BULB WITH COMPACT FLUORESCENT LAMP (CFL) IN ELECTRIC POWER SYSTEM http://laujet.com/index.php/laujet/article/view/231 <p>The clamour to replace the high wattage linear load with energy saving non-linear loads is on the increase. However, side effect of such replacement needs thorough analysis before the full implementation. This study presented the effect of replacing incandescent bulbs with compact fluorescent lamp on harmonic distortion in a model building estimated to require 28 incandescent lamps for lighting. All the incandescent lamps were first switched on and set of readings taken with the waveform. Two of the lamps were replaced with compact fluorescent lamp (CFL) and measurement repeated. The process was repeated until only CFLs were now left to obtain fifteen set of readings. Parameters measured include total harmonic distortion (THD), crest factor, root means square and peak values of both voltage and current. The equipment used was power and harmonic analyzer. The result showed that the THD and CF increased from 1.5% and 1.412 with only linear loads to 100% and 3.045 with only CFL respectively. The waveforms from analyzer’s screen show a highly distorted waveform with only CFLs. The various stakeholders in power industries need this information for proper planning and policy to regulate the influx of CFLs and other non-linear devices and to mitigate their impacts in the existing weak electric power system.</p> J. OGUNYEMI I. A. ADEJUMOBI ##submission.copyrightStatement## 2018-03-19 2018-03-19 12 2 33 40 COMBUSTION AND MECHANICAL PROPERTIES OF BAMBOO (BAMBUSA VULGARIS) AND THREE INDIGENOUS WOOD CHARCOALS http://laujet.com/index.php/laujet/article/view/233 <p>This study investigated the combustion and mechanical properties of bamboo (Bambusa vulgaris) charcoal and three indigenous wood charcoal (Teak ,Tectona&nbsp;grandis; Afara, Terminalia superba&nbsp; and Omo, Cordia millenii). Results revealed that there were no significant differences in the properties charcoal produced from bamvboo and the tree indigenous wood. Bamboo and Afara were the most efficient out of the charcoal samples considered in the study. Although the fuel value index of Bamboo was quite lower than that of Afara and other samples considered in the study, but its calorific value was higher than Afara.&nbsp; However, it has greater potentials to replace woody biomass as fuel. Bamboo can replace other wood species in the production of charcoal because of its faster growth rate.</p> A. Ogunsola T. M. A. Olayanju O. U. Dairo O. R. Adetunji O. J. Adeosun P. O. Omotainse ##submission.copyrightStatement## 2018-03-03 2018-03-03 12 2 41 45 PERFORMANCE IMPROVEMENT OF POWER SYSTEM NETWORKS USING FLEXIBLE ALTERNATING CURRENT TRANSMISSION SYSTEMS DEVICES: THE NIGERIAN 330 KV ELECTRICITY GRID AS A CASE STUDY http://laujet.com/index.php/laujet/article/view/234 <p>A wide electricity supply-demand gap especially in developing economy such as Nigeria has created series of challenges such as frequent power outages, poor voltage profile and high power losses among others yet to be addressed. This work examines the effect of Static Var Compensator (SVC), a Flexible Alternating Current Transmission Systems (FACTS) device for performance improvement of power system networks with the Nigerian 330 kV, 28-bus electricity grid considered as a test network. The steady state performance of the system was modeled using Newton-Raphson load flow equations and was simulated without and with compensation on MATLAB/PSAT toolbox (version 2.1.9 ‘R2012a’). The obtained results showed that the system voltage profile improved to acceptable limit defined as &nbsp;with compensation compared to when voltage magnitudes of buses 9, 13, 14, 15, 16, 19, 22 and 26 of the test network fell outside of the acceptable limit without compensation. Also, the system total active power loss reduced from 15.727 MW without SVC to 14.709 MW with SVC, giving a 6.47% reduction in total active power loss. These results showed that the inclusion of SVC on the Nigerian electricity grid will improve both voltage profile and power transfer capability of the system.&nbsp;&nbsp;</p> O. I. Adebisi I. A. Adejumobi P. E. Ogunbowale O. O. Ade-Ikuesan ##submission.copyrightStatement## 2018-03-03 2018-03-03 12 2 46 55 REVIEW ON CASSAVA MASH SIF TING METHODS AND MECHANISMS http://laujet.com/index.php/laujet/article/view/232 <p>Cassava is presently the most important food crop in Nigeria from the point of view of both the area cultivated and the tonnage produced.Cassava has transformed greatly into high yielding cash crop, a foreign exchange earner as well as a crop for world food security and industrialization. As a result of this, there has been an unprecedented rise in the demand for cassava and its numerous products worldwide for both domestic and industrial applications. However, cassava processors are currently finding it extremely difficult to respond positively to this increase in demand due to the prevalence of the traditional processing methods employed the sifting operation inclusive. This has made the appraisal of the current sifting technologies pertinent in order to address the areas that need technical improvement and further research efforts towards the evolution of cost effective sifting technologies with improved efficiencies which would enhance the capacity to exploit the cassava market potential.&nbsp; Therefore, this paper reviews the efforts made, and currently being made towards an efficient and cost effective mechanization of cassava mash sifting operation so as to overcome the challenges being faced using traditional method of sieving cassava mash.</p> D. Lasisi B. A. Adewumi O. U. Dairo O. S. Awonorin ##submission.copyrightStatement## 2018-03-19 2018-03-19 12 2 56 66 AN mAGRICULTURE FRAMEWORK FOR AGRICULTURE INFORMATION SERVICES DELIVERY http://laujet.com/index.php/laujet/article/view/295 <p>Agriculture is an information intensive industry that is spatial in nature. For farmers to thrive, they must be generalists who are well versed in the latest farming technologies. Thus, farmers need to be well informed on the best agricultural practices, prime farming operation techniques, optimum methods of management, prevailing post harvest operations and transactions and so on. However, Nigerian and African agriculture in general is disadvantaged owing to factors that include: poor access to agriculture-related information, deficits in physical infrastructure, high transactional costs, digital divides, low literacy level, problems with availability of agricultural inputs to mention but a few. In this paper, we present an mAgriculture framework for agricultural information services delivery using the communication channels available on a feature phone. Features phones are easy to use and are increasingly able to bypass the barriers of illiteracy and affordability, and they provide access to a wide range of very useful services, such as transferring money, checking market prices, gathering weather information, obtaining personal agricultural extension and other professional advice. The three basic communication channels of feature phones employed by the developed framework are: voice, short message service (SMS) and Unstructured Supplementary Service Data (USSD) with the intent of providing a platform where farmers’ need of agriculture information could be met.</p> O. O. Okediran R. A. Ganiyu T. A. Badmus ##submission.copyrightStatement## 2019-03-19 2019-03-19 12 2 72 79