EMPIRICAL MODELING OF THIN LAYER DRYING CHARACTERISTICS OF NAUCLEA LATIFOLIA LEAVES

Adeyi, Oladayo and Adeyi, A.J. and Oke, E.O (2018) EMPIRICAL MODELING OF THIN LAYER DRYING CHARACTERISTICS OF NAUCLEA LATIFOLIA LEAVES. Journal of the Nigerian Society of Chemical Engineers, 13 (10). pp. 17-25.

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Abstract

The thin layer drying characteristics of Nauclea latifolia leaves were studied at four drying temperatures of 35, 45, 55 and 65oC and a constant air velocity of 1.5 m/s in a convective dryer. Experimental kinetic data were fitted to four established drying models available in the literature, namely: the Newton, Henderson and Pabis, Page and Logarithmic models. Model parameters were determined by using non-linear regression analysis while the goodness of fit was assessed by the coefficient of determination (R2 ), root mean square error (RMSE) and the standard error (SE). Fick’s diffusion model and Arrhenius-type equation were used to determine the effective diffusivity and activation energy, respectively. The increase in air temperature significantly reduced the drying time of the Nauclea latifolia leaves. Among the models proposed, the Page model was found satisfactory for describing the air-drying kinetics of Nauclea latifolia leaves. The effective diffusivity increases as temperature increases and ranged between 3.3841 E-08 - 1.1202 E-07 m2 /s while the activation energy of diffusion was estimated to be 40.55 kJ/mol. Keywords: Nauclea latifolia leaves, Convective drying, Modeling, Activation energy, Moisture diffusivity.

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