Department of Chemical & Petroleum Engineering

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Browsing Department of Chemical & Petroleum Engineering by Author "Ayo, D. B."

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  • Item
    Open Access
    Computer Aided Design of Circular Clarifiers,
    (Journal of the Nigerian Society of Chemical Engineers, 2013) Odediran, E. T.; Ayo, D. B.; Akinola, A. A.
    An algorithm was developed for the design of primary circular clarifier for Wastewater treatment. Three computer programs were developed using Microsoft Excel, FoxPro and MATLAB respectively, all based on the algorithm. Computational Results from the three programs were not significantly different from those carried out manually. The algorithm was validated by feeding operational data (influent and effluent conditions) from the Primary clarification unit of the City of Springfield Wastewater Treatment Plant (WWTP), Ohio, USA into the three computer programs. The results of calculations from the computer programs using data from the Springfield WWTP were not significantly different from the design data of the WWTP.
  • Item
    Open Access
    Temperature Dependence of the Effective Moisture Diffusivity of Yam (Dioscorea rotundata) Slices Dried Using a Refractance WindowTM Dryer
    (The Journal of the Association of Professional Engineers of Trinidad and Tobago, (JAPETT), 2018) Akinola, A. A.; Ayo, D. B.; Ezeorah, S. N.
    The study presents the dependence of the effective moisture diffusivity of yam slices on temperature. A laboratory-scale Refractance WindowTM dryer was used in the investigation. Moisture content measurements of 4.5 mm thick yam slices, dehydrated at water temperatures of 65oC, 75oC, 85oC, and 95oC in the dryer were determined. The experimental drying data obtained was used to estimate the moisture diffusivities, and the activation energy for the process conditions considered. The effective moisture diffusivities estimated using Fick’s second law for 4.5 mm thick yam slices, varied between 1.94 x10-09 m2s-1 and 2.54 x10-09 m2s-1 for the temperatures studied. The activation energy estimated using the Arrhenius type equation was 29.64 kJ/mol for the given temperature range. The effective moisture diffusivities values are slightly higher than those reported in the literature because the investigations were performed at higher temperatures than those found in the literature. Higher moisture diffusivities imply that there is higher moisture movement through the interstices of the slices, which in turn indicates a higher rate of drying. However, the activation energy is within those reported in the literature. Knowledge of these parameters will aid in the design, modelling, and operation of a Refractance WindowTM dryer.