Browsing by Author "Olorunmaiye, John A."

Now showing 1 - 12 of 12
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    Assessment of Oil and Gas Pipeline Risks
    (University of Ilorin, 1995-12) Olorunmaiye, John A.
    Pipelines are commonly used to transport oil and gas because they are more energy-efficient than other methods of transporting oil and gas. The possible hazards from release of oil or gas from a pipeline leakage or rupture are explosion, fire or pollution of the environment. A computer programme written to compute unsteady flow in natural gas pipeline was used to calculate the rate of gas release from a ruptured 49 km pipeline section. After one thousand seconds when about 70 % of the gas had been released, the explosion hazard zone had grown to a radius of about 252m from the ruptured pipeline. Pipelines should be patrolled by ground and aerial surveillance teams and they should be inspected regularly to avoid catastrophic failure and ensure the safety of the pipeline system.
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    Computation of Chemically Reacting Unsteady One-Dimensional Flows
    (The Mathematical Association of Nigeria, 1989-09) Olorunmaiye, John A.
    A mathematical model of one-dimensional chemically reacting flow is presented. The effects of wall friction, heat transfer and gradual area change are inclined in addition to the effects of chemical reaction on the composition and specific heats of gas. The set of quasi-linear hyperbolic partial differential equations obtained are solved by a numerical method of characteristics. The equations for various boundary conditions are also presented.The model was applied to a shock tube in which no chemical reaction took place. The pressure at the closed left end of the shock tube predicted with the model was in very good agreement with the result obtained by Rudinger using a graphical method of characteristics. The model was also applied to a simple quarter-wavelength organ-pipe pulsed combustor. The combustion process was modelled using a simple overall reaction rate equation. The model predicted pressure amplitudes that are in good qualitative agreement with experimental results.
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    Computation of Natural Gas Pipeline Transients, Including Frictional and Heat Transfer Effect
    (DEMEC Escola de Engenharia UFRGS, 1994-09-28) Olorunmaiye, John A.
    To achieve an economical design of natural gas pipeline it is necessary to do a detailed analysis of the transients caused by various operating flow conditions. In this work, unsteady flow in natural gas pipeline was modelled as one dimensional frictional flow with the effect of heat transfer included. The model was used to compute the flow in a ruptured underwater gas pipeline. The predicted mass flow rates out of the pipeline were between 8 and 25 % higher than the results obtained earlier for isothermal unsteady flow.
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    Cooling Degree- Days for Selected Locations in Nigeria
    (Academy for Scientific Research and Technology, National Committee for Refrigeration and Air Conditioning, Cairo, Egypt, 2001-05-01) Olorunmaiye, John A.
    "Degree-days" is used to quantify the duration and severity of hotness or coldness of a climate cooling degree-days is the accumulation positive differences between observed temperature and the base temperature. From hourly dry-bulb temperature data for Ikeja (Lagos) and Ilorin for 15 years, average monthly and annual total cooling degree-days were computed for base temperatures varying from 24 degree-days from the data for the two locations. In addition, a typical one year dry-bulb temperature data were obtained for each of eleven other locations in Nigeria and cooling degree-days were calculated directly from the data and also from the mathematical model for cooling degree-days developed earlier from the data for Ikeja and Ilorin. The annual total cooling degree-days for a base temperature of 24 degree C obtained from weather data were 298.9, 784.4, 951.7, 971.9, 989.6, 1012.5, 1022.7, 1051.5, 1076.3, 1225.2, 1431.4, 1803.6 and 1999.6 degree C - days for Jos, Kaduna, Ibadan, Port-Harcourt, Benin, Calabar, Ikeja (Lagos), Ilorin, Enugu, Abuja, Kano, Maiduguri and Sokoto, respectively. Degree-days predicted using the mathematical model agreed quite well with the values listed above. Cooling degree-days are useful in estimating the cost of cooling over a period of time.
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    Effect of Draught on Evaporative Cooling in Earthenware Ports
    (JSET, 1996-10) Olorunmaiye, John A.
    An earthenware pot filled with water was exposed to draughts of 8.9 km/h and 15.7 km/h, at different times, from a fan. Water temperature, room air dry-bulb temperature and relative humidity and mass of water left in the pot were measured hourly or bi-hourly. Water temperature depressions up to 106 % of wet bulb depression and water cooling rates up to 146 W per square metre surface area of the pot were obtained.
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    Evaluation of Outside Air Design Dry and Wet Bulb Temperatures for Air Conditioning Systems in Nigeria
    (The Nigerian Society of Engineers, 2015-06) Olorunmaiye, John A.; Awolola, Olalekan O.
    There is increase in the ambient temperature being experienced around the world due to global warming and this has caused the energy consumption of cooling systems to increase. Statistical analysis was carried out on meteorological data obtained from Nigerian Meteorological Agency for 18 towns in Nigeria for 1994 - 2008 or 1995 - 2009. The weather variables considered in this study were hourly relative humidity and dry bulb temperature, three hourly wet bulb temperature and vapour pressure. The averages of dry bulb temperature, wet bulb temperature and vapour pressure were computed. The four warmest months were determined for each location, from which the outdoor 1 %, 2.5 %, and 5 % design conditions of dry bulb temperature, wet bulb temperature and vapour pressure were computed using Normal Distribution tables for each town. The design month is the month with the highest average maximum temperature. The following design months were obtained from the results: February is the design month for Benin City, Calabar, Ibadan, Ondo, Owerri and Port Harcourt; March for Abuja, Enugu, Ikeja, Ilorin, Jos and Minna, April for Bauchi, Kaduna, Kano, Maiduguri, Sokoto and Yola. The 21/2 % outside design dry bulb and wet bulb temperatures obtained for 1951 - 1965 by earlier workers were compared with those obtained for 1994 - 2009 in this work. The percentage differences obtained were 13 - 25 % for dry bulb design temperature and from 2 - 40 % for wet bulb temperature. It was concluded that climate change has caused outside design conditions for air conditioning systems to change and results obtained in this work should be used to replace the design conditions formerly used by engineers which were obtained from earlier periods. This work is useful in preparing a revised code of practice for comfort air conditioning system design for Nigeria.
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    Experimental Investigations of Valveless Pulsed Combustors of Industrial Heating Furnaces
    (JSET, 1996-10) Olorunmaiye, John A.
    The variations of pressure amplitude, static thrust, heat flux, operating frequency, wall and gas temperatures with fuel flow rates are valveless pulsed combustors. Wall and gas temperatures, static thrust, pressure amplitude, and heat flux in the combustors increased with fuel flow rate. The valves of gas temperature and thrust produced show that this combustor is suitable for melting and heat treatment furnaces. Despite the high convective heat transfer in the pulse combustor, only about 10 % of the heat generated is lost through the wall, the rest being available in the exhaust jets for heating in the furnace.
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    Feasibility of Dehumidifiers for Air-Comfort and Storage Applications in Nigeria.
    (The Nigerian Society of Engineers, 1999-09) Olorunmaiye, John A.
    The use of a dehumidifier as a home appliance was advertised in one of the dailies. To investigate the feasibility of using dehumidifiers in Nigeria, fifteen-year dry-bulb temperature and relative humidity data for Ikeja and Ilorin were analysed to get the two-dimensional dry-bulb temperature/relative humidify data for the two locations. From the results, the average number of hours per year in the comfort zone defined by American Society Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) were found to be 182 and 1177 for Ikeja and Ilorin, respectively. It was also found that using a dehumidifier that takes the room air through only a dehumidification process (dry-bulb temperature remaining constant) to bring the relative humidity below 70 % can bring additional 76 %and 58 % of the 8766 hours in a year into the comfort zone at Ikeja as representative of coastal areas and Ilorin to be representative of locations further from the coast in the rest of southern states and parts of the middle-belt, it can be concluded that the use of dehumidifiers is feasible for air-comfort in the southern states and southern part of the middle-belt in Nigeria. Dehumidifiers can also be used to bring relative humidity below 65 % required to grain storage even in the coastal areas. Therefore, a dehumidifier is a useful household appliance in the southern and middle-belt states.
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    Melting of Aluminium in Pulsed Combustor Fired Furnace.
    (The Nigerian Society of Engineers, 2011-03) Olorunmaiye, John A.; Popoola, Olalekan T.; Ibrahim, Rasaq
    The paper presents an experimental investigation of the use of a locally fabricated SNECMA-Lockwood type pulsed combustor to fire a metallurgical furnace designed for melting low melting point metals. The fuel used for firing the combustor is Liquefied Petroleum Gas (LPG) sold in Nigeria. The working space of the furnace is 290 mm by 290 mm by 485 mm. The exit port of the pulsed combustor was fired into the Metallurgical furnace. Results showing the variation with time of the pulsed combustor exit port temperature. Temperature of 680 degree C was attained in the furnace when it was empty while a maximum temperature 66.7 degree C was attained when it was loaded with aluminum scraps. The aluminum scrap was melted in about thirty five minutes and the molten aluminum was used to cast two small objects. The result shows that a metallurgical furnace fired with pulsed combustor could be used to melt low melting metals like aluminum and lead.
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    Presentation Skills for Engineers
    (The Nigerian Society of Engineers, 2016-03) Olorunmaiye, John A.
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    The State of Engineering Sciences in Nigeria.
    (The Nigerian Society of Engineers, 2015-06) Ali, Kashim A.; Olorunmaiye, John A.
    Engineering Sciences include engineering fundamentals that have roots in mathematical and natural sciences with knowledge extended to develop models and methods to solve practical problems. The types of knowledge used by engineers in their work are wide ranging and knowledge of engineering sciences is just one of the knowledge types. An engineer uses his knowledge of engineering sciences to develop a model to analyse each candidate solution proffered for a problem. Most of the courses taken by undergraduate engineering students are engineering science courses. The postgraduate courses and research are even more preponderantly in engineering sciences than undergraduate courses. The laboratory, computational facilities, manpower and funding are inadequate for teaching and research in engineering sciences in Nigerian Universities at undergraduate and postgraduate levels. To accelerate the production of enough man power to teach engineering sciences in Nigerian Universities, it is strongly recommended that funding be provided by Nigerian government for PhD students in Nigerian Universities and post-doctoral fellows who did their PhD work in Nigeria to go for 3 to 6 months research visits to universities in developed countries.
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    Study of Energy Consumption for Optimum Poultry Yield in Nigeria: Nefraday Farm Ltd Ilorin as a Case Study
    (The Nigerian Society of Engineers, 2013-06) Olorunmaiye, John A.; Awolola, Olalekan O.
    The work reported in this paper involves studying the energy consumption for optimizing poultry yield in Nigeria using NEFRADAY farm as case study. The energy consumption of the hatchery section of the farm alongside the environmental temperatures for a period of thirty (30) days were measured. The temperature data were analyzed to determine the heating degree day for the period and this was related to the energy consumption for each day. The linear regression obtained between energy consumption (EH in kWh) and the heating degree-day (DH in degree Celsius-day) was: EH = 4.448DH. This equation was applied for estimating energy consumption for all the months of the year using available calculated degree-days for Ilorin. It was concluded that February is the period that is most suitable for hatchery business in Ilorin since the energy consumption is lowest for that month.