Browsing by Author "Thomas A. Orhadahwe"

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    Non-isothermal kinetic parametric evaluation of Tectona grandis using model-fitting methods
    (Elsevier, 2021-02-07) Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; Jamiu Kolawole Odusote; Thomas A. Orhadahwe; O. A. Lasode; Samuel Oluwafikayo Adegoke; Olanrewaju Seun Adesina
    Abstract Non-isothermal kinetic parameters of the pyrolysis process of Tectona grandis were evaluated with different model-fitting methods. The thermal degradation of the Tectona grandis was examined using a thermogravimetric analyser. Pulverized Tectona grandis (6.5 mg) was heated from 30 to 800 °C at varying heating rates (5, 10 and 15 °C / m i n ) in an inert environment. The results depicted that heating rate has no effect on weight loss during the reactive drying zone. However, as the thermal analysis progressed into the active pyrolysis and passive pyrolysis zones, the weight loss decreased with increase in heating rate. The kinetic parameters evaluation revealed that the GB model was best fit to evaluate the kinetic parameters of teak in the active pyrolysis zone, while GB and Mampel models were considered most appropriate for the evaluation of the kinetic parameters in the passive pyrolysis zone. Model-fitting method has the capacity to capture wide range of fractional conversion.
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    Recent Development in Casting Technology: A Pragmatic Review
    (International Information and Engineering Technology Association, 2022-04-30) Adekunle Akanni Adeleke; Makanjuola Oki; Ikechukwu K. Anyim; Peter Pelumi Ikubanni; Adeolu A. Adediran; Ayokunle A. Balogun; Thomas A. Orhadahwe; Peter O. Omoniyi; Adebayo S. Olabisi; Esther T. Akinlabi
    More reliable and durable parts with high structural integrity are required to meet the increasing advancements in science and technology. This paper reviews five (5) different casting techniques: squeeze casting, sand casting, investment casting, die casting, and continuous casting. Their respective cast products were examined, and their various mechanical properties were discussed. However, these different casting techniques involve a similar fundamental procedure: melting metal, pouring it into a mold, and allowing it to solidify. However, they vary in their physical and mechanical properties, durability, and surface finishing, making one technique more desirable than the other in their application areas. Some techniques were found to be more advantageous and effective than the other, which will aid foundrymen in making the best decision in choosing a technique, considering parameters such as environmental friendliness and cost implications. The appropriate implementation of these will help restructure and refine foundries, improve the quality of cast products, and set the casting technology world on course for the new age.