Browsing by Author "Olalekan Tajudeen POPOOLA"

Now showing 1 - 4 of 4
  • Item
    Modelling and Numerical Investigation of Pressure Drop of Viscous Fluid in Elbow Pipe using Colebrook-White Equation
    (Department of Civil Engineering, University of Ilorin, 2026) Olalekan Tajudeen POPOOLA; Hassan Kobe IBRAHIM; Mubarak Oluwatobi BELLO; Adebola Idowu SANNI; Gabriel Olamide COKER; Abraham Ojonugwa CLEMENT; Joel Shola DADA; Wasiu Oseiwe BUSARI
    Elbows constitute resistance to flow, increase energy losses, and increase pumping power. This current study presents a mathematical model for analyzing pressure drop in elbow pipes for viscous fluids with flow conditions in turbulent flow regimes. The selected pipes were two 90º 100 mm nominal diameter schedule 40 commercially available steel elbow pipes of different geometries. The mathematical model developed was validated with experimental results, and numerical simulation for the model was conducted using MATLAB with varying parameters such as velocity and friction factor. Results showed that for low viscous flow with velocities ranging from 0.33 to 6 m/s, the pressure drop values obtained were between 0.0128 and 6.1669 kPa and 0.0087 and 4.2195 kPa for short-radius elbows and long-radius elbows, respectively. For higher viscous fluids with velocities ranging from 46.26 to 100 m/s, pressure drop values obtained were between 431.6507 and 3919.1 kPa and 295.34 and 2681.5 kPa for short-radius and long-radius elbows, respectively. The results of the study can function as a guide in the choice of 90° elbow pipe used in manufacturing and process industries for the transport of the viscous fluids treated.
  • Item
    Modelling, Simulation and Experimental Validation of Half Semi-Truck Suspension System Vibration
    (Published Faculty of engineering, University of Ilorin, 2025) Olalekan Tajudeen POPOOLA; Ibrahim, Hassan Kobe; Akinola, E.A.; Osatuyi, F.W.; Tijani, Z.O.; Abdulazeez, K.O; Mustapha, F.O; Kelani, T.M.
    This paper is aimed at modelling and experimental validation of the vibration models of a semi-truck suspension system. A half-car (4-degree-of-freedom) model was developed for the semi-truck vehicle using the Newton law and simulated using SCILAB-Xcos. The analysis specifically focused on the acceleration response of the vehicle body at different speed levels (10, 20, and 30 km/hr), which was determined with the smartphone-installed accelerometer (Keuwl app). The simulated root mean square accelerations of 0.33, 0.55 and 0.72 m/s2 revealed a favourable comparison with the experimental root mean square accelerations (0.31, 0.54 and 0.69 m/s2) at 10, 20 and 30 km/hr, respectively. This showed that the ride comfort is not an uncomfortable zone at low speeds, and many are considered fairly uncomfortable. The findings provided valuable insights into the dynamic behaviour of semi-truck vehicles, highlighting the role of speed in suspension system performance. This information can be utilised to optimise vehicle performance, enhance ride comfort, and improve overall safety.
  • Item
    Performance Evaluation of Aluminum-in-Pot Evaporative Cooler
    (School of Science and Engineering, São Paulo State University (UNESP), 2025) Olalekan Tajudeen POPOOLA; Issa, Haruna Ayotunde; Adegun, Isaac Kayode; Omoniyi, Peter Olorunleke; Ibrahim, Hassan Kobe
    Cooling applications by refrigeration and air-conditioning require electricity as a source of energy not abundantly available in sub-Saharan African countries. Post-harvest losses of vegetables are caused by poor storage facilities, poor transportation systems, and lack of processing facilities. The current study aimed to evaluate the performance of developed solar-powered Aluminium-in-pot evaporative coolers lined with clay and charcoal blends for the preservation of tomatoes. The evaporative cooler consisted of Aluminium pots inserted into an earthenware mould pot, and the space between the two pots filled with lining media of clay, charcoal, and blends of the two in different ratios. The dry bulb temperature of the ambient air, inner temperatures of the cooling chambers, and relative Humidity were measured using fresh tomatoes as a load for the coolers. The temperature variations of the coolers were recorded for fifteen consecutive days. It was found that the inner temperatures for the five evaporative coolers were significantly different from the dry bulb temperature of the ambient. The temperature of sample E had the lowest temperature range of 19.65 C to 23.65 C for the no-load test, 21.15 C to 25.29 C for the load–load-test (better boy), and 21.1 to 23.25 C for the load test (Plum). The daily temperature in the coolers dropped significantly to a range of between 3.4 C to 10.46 C with a corresponding daily RH range of 30.93% to 39%. The variations in the efficiency of Sample E were found to be averagely 84% at no load, 72% when loaded with Better Boy and 77% when loaded with Plum tomatoes. The aluminium in pot evaporative cooler could be used for a short-term preservation of tomatoes in remote areas where electricity is not available.
  • Item
    Proximate and Mineral Analysis of Evaporative Cooled Tomatoes
    (Faculty of Technology, Ladoke Akintola University of Technology, 2026) Olalekan Tajudeen POPOOLA; Issa, Haruna Ayotunde; Adegun, Isaac Kayode; Ibrahim, Hassan Kobe
    Postharvest losses of tomatoes remain a major challenge in sub-Saharan Africa due to erratic power supply and inadequate storage systems. This study evaluated the effects of aluminium-in-pot evaporative cooling systems on the proximate composition, mineral content, and physiological weight loss of two tomato cultivars (UTC and Plum). The tomatoes were stored in five different Aluminium-in-pot evaporative (A, B, C, D and E) coolers and under ambient conditions (control). The proximate analysis was done using Association of Official Analytical Chemists (AOAC) methods, while mineral contents, lycopene, and vitamin C were determined using an atomic absorption spectrometer and titrimetric methods, respectively. Results showed that weight loss in the evaporative cooling system ranged from 2% to 9% as compared to the weight loss of the control case, which varied from 3.7% to 25%. The shelf life of tomatoes in evaporative cooler E was extended to 15 days, while for the control case, it lasted only 4 to 5 days. Additionally, evaporative cooling significantly reduced weight loss and rate of decay while improving retention of moisture, vitamin C, lycopene, and essential minerals relative to ambient. These findings demonstrate the effectiveness of evaporative cooling as a low-cost, sustainable technology for extending tomato shelf life and preserving nutritional quality, with potential applications in post-harvest storage system design.