School of Infrastructure Process Engineering and Technology (SIPET)
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School of Infrastructure Process Engineering and Technology (SIPET)
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Item Investigation of the Temperature Variations in Aeroderivative Gas Turbine Blade Cooling(Journal of Materials Engineering, Structures and Computation, 2023-11-22) Orah, A. .M.; Nasir, .A.; Hassan, .A.B.; Bori Ige; Ayo, .S. A.In order to improve performance and efficiency, modern-day gas turbines operate at high temperatures. It is essential to use suitable cooling techniques on the blade and other hot areas since the elevated temperatures might exceed the metal melting temperature of the turbine blades. This paper presents the numerical modelling of heat exchange in a cooled aerodrivative gas turbine blade depending on the Newton’s law of cooling equation as governing equation, then integrating the heat transfer coefficient by convection into the alternating direction implicit (ADI) approach of computational fluid dynamics (CFD). Based on the chosen boundary conditions and the gas turbine's intended cooling characteristics, a model for the heat transfer problem was created. A MATLAB code was developed to ascertain the temperature variations inside a cooling blade for a half-hour in-service operation. This study found a temperature difference between the transient and final temperature values of roughly 25 to 300oC, demonstrating the heat transfer process between the hot gases and the coolant air. It inferred effective heat transmission from the blades to the cooling air because the temperature differential within the blades did not rise over the melting point of the blade material and it yielded an average blade temperature of 400°C. Thus, the ADI technique is appropriate for heat transfer design calculations for intricate devices such as the gas turbine engine.Item Improving the Stability of Semi Trailer Articulated Vehicles(International Journal of Research in Science & Engineering, 2023-06-17) Bako Sunday; Dogo Jacob Nonom; Umar Muhammed Bello; Gora Nuhu Mba; Bori IgeThe transportation of industrial products is an important function of every industry involved in mass production. This is mostly done with the use of semi trailer articulated vehicles. The dynamics characteristic of these vehicles differs from those of other vehicles, and their accidents are fatal and destructive leading to lost of lives and valuable properties. Therefore, there is a need for continuous research and improvement of the stability of these vehicles. This paper aimed at reviewing literatures on improvement of stability of this vehicle in order to ensure safety of lives and properties. Driver Assistance Systems (DAS) such as Semitrailer Differential Braking Technique (SDBT), Roll Stability Control (RSC) system, Electronic Stability Control (ESC) system, Active Yaw Control (AYC) system, Linear Quadratic Regulator (LQR) controller, Robust LQR (RLQR), were noted as an efficient method for combating the vehicle instability and loss of control. It was noted that the RWA is an important parameter for determining the rollover propensity of this vehicle., while a driver model would be of great important to investigate the interaction between the driver and Driver Assistance Systems (DAS).Item Numerical Simulation and Analysis of the Acoustic Properties of Bimodal and Modulated Macroporous Structures(Applied Sciences (MDPI), 2023-11-20) Otaru, A. J; Adeniyi, O. D.; Bori Ige; Olugboji, O. A.; Odigure, J. O.In recent decades, cellular metallic materials have increasingly been used for control of reverberation and cutback. These materials offer a unique combination of expanded pores, high specific surfaces, improved structural performance, low weight, corrosion resistance at high temperatures, and a fixed/rigid pore network (i.e., at the boundaries, porosity does not change). This study examines the ability of sphere-packing models combined with numerical modelling and simulations to predict the acoustic properties of bimodal and modulated bottleneck-shaped macroporous structures that can realistically be achieved through liquid melts infiltration casting technique. The simulations show that porosity, openings, pore sizes and permeability of the material have significant effects on acoustics, and the predictions are consistent with experimental data substantiated in the literature. The modelling suggests that the creation of bimodal structures increases the capacity of the interstitial pores and pore contacts. The result is improved sound absorption properties and spectra, characterised by a pore volume fraction of 0.73 and a mean pore size to mean pore opening ratio of 4.8 for the 50% volume bimodal structure created at a 10 m capillary radius. The importance of how pore structure-related parameters and existing fluid flow regimes can modulate the sound absorption performance of macroporous structures was revealed by numerical simulations of the sound absorption spectra for dual-porosity and dilated macroporous structures working from high-resolution tomography datasets. Sound absorption properties were optimised for structures having pore volume fractions between 0.68 and 0.76, maintaining the mean pore size to mean pore opening ratios between 4.0 and 6.0. Using this approach, enhanced and selfsupporting macroporous structures may be designed and fabricated for efficient sound absorption in specific applications.Item Development Of an Automated Dual Powered Kiln for Drying and Preservation of Fish(Iconic Research and Engineering (IRE) Journals, 2024-04-20) Ogundana, O.S.; Adejumo, B.A.; Orhevba, B. A.; Bori IgeFish smoking is a major activity in the fish industry. In most river-reining communities in Nigeria, where fish business is very prominent smoking operations are mostly carried out manually and under unhygienic conditions. The concept of the smoking kiln development is to ease the drudgery associated with traditional methods in the fish processing communities. The materials for the developed automated dual powered kiln for fish smoke-drying are locally and cheaply sourced. The developed automated dual powered kiln was made from angle iron and lagged with (composite materials) insulator to prevent heat loss, the smoking chamber consists of 3 set of trays of 0.57 x 0.57 x 0.021 m. It was a dual powered kiln of gas and electric heat sources (DC), its heating elements (heaters) are connected with the aid of wire gauze made from stainless steel placed in a compartment in the heating chamber. The developed automated dual powered kiln was tested with Cat Fish (Clarias Gariepinus) using gas and electric heat sources. Test results indicated an average operational temperature of 80⁰C and moisture loss of 50% on the smoked fishes. The kiln gave higher drying rate and quality of finished product was good in colour and dryness, indicating a long shelf life.Item Heat Transfer Analysis of a Concentrated-Type Solar Dryer for Ginger(2024-12-30) Bori Ige; Jiya .J.Y.; Orah .A.M.; Bako .S.; Oyebamiji .M.O.In recent years, global concern about the preservation of agricultural products for usage and exports through drying has been outstanding. Solar Parabolic Trough Collectors (SPTC) are used to dry various agricultural products for effective moisture removal. A heat transfer fluid (HTF) flows through a receiver tube pipe that absorbs solar radiation reflected from the stainless-steel sheet surfaces of the SPTC. In order to reduce the heat losses, the pipe was linked through a flexible, thermally insulated cross-linked polyethene pipe to the copper tubes inside the drying chamber. The heat transfer analysis of the SPTC is essential to understand the thermal behavior and its performance during the drying process. This paper examined the heat exchanges developed in the designed concentrated-type solar dryer, and the heat transfer rates in the receiver tube and the drying chamber, as well as the heat transfer coefficients for the solar drying of ginger, were determined. The thermal analysis of the convective heat exchanges within the receiver tube and the drying chamber is presented. The heat transfer coefficients hRec and hDC for the convective heat transfer process in the receiver tube and the drying chamber were 1372.48W/m.K and 17.60W/m.K, respectively. The dryer’s thermal efficiency was 30%, showing considerable moisture removal from the ginger samples. The mean temperature difference between the drying chamber and the ambient showed a considerable increase of about +11oC. This resulted in considerable moisture removal, and the final moisture content achieved by the concentrated solar dryer for the ginger samples was 11.1%, compared to the 23.74% achieved by the open-air solar (OAS) drying method.