Browsing by Author "Olusola Faith Ajao"

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    Design and Performance Evaluation of a Multi-Tuber Peeling Machine
    (AgriEngineering, 2020) Adeshina Fadeyibi; Olusola Faith Ajao
    Tuber peeling is an essential unit operation prior to further processing. In this research, a batch loading tuber-peeling machine, with a capacity of 10 kg/min, was designed, fabricated and tested for cocoyam, sweet potato, yam and cassava tubers. The machine was designed to operate at a speed range of 350–750 rpm and time range of 5–12 min based on the principle of surface scratching. The performance of the machine was determined with respect to the peeling efficiency, percent weight of peel and flesh loss. The results showed that the peeling efficiency increased with an increase in the shaft speed for all the tubers. Also, the flesh loss and percent weight of peel decreased with an increase in the shaft speed for cassava and cocoyam tubers but increased for sweet potato and yam tubers (p < 0.05). Effective peeling of the tubers was achieved for sweet potato and yam at all the shaft speeds and time ranges considered.
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    Prediction of Tuber Peeling Rate Based on Classical Particle Removal Theories.
    (Published by King Mongkut's Institute of Technology Ladkrabang., 2021) Adeshina Fadeyibi; Rasheed Amao Busari; Olusola Faith Ajao
    Classical particulate modeling is a mathematical approach that is suitable for describing the behavior of a processing machine because of its ability to accommodate varying degrees of technical parameters. This research was carried out to predict the peeling rate of an existing multi-tuber peeling machine using classical particle removal theories. The machine was designed to peel fresh cassava, sweet potatoes, and cocoyam tubers at a speed range of 350-750 rpm using a selection gear system. The tuber peeling rate were determined over 1-h of machine operation at intervals of 5 min. The classical Weibull and Jennings models, formulated for removing impurities from the outer surface of solids, were used to constitute the models for predicting the peeling rate and the amount of tuber peels removed. The machine was rerun for another 30 min, and the values of the peeling rates and the amount of peels removed were computed and used for the independent validation of the resulting models. Results show a log increase in the peeling rate of the machine with an increase in the residence time and the speed of the machine operation (p< 0.05). Also, the Weibull model parameters were better estimator of the peeling rate with R2 > 95% and Mean Square Error less than10%, irrespective of the speed and the residence time of machine operation. Therefore, the models can be used for predicting the peeling rate of the machine within its operating speed limits.