Effective diffusivity and convective mass transfer coefficient during the drying of bananas

Engenharia Agrícola

Cleide M. D. P. Da S. E Silva²  Wilton P. Da Silva¹  Vera S. De O. Farias¹  Josivanda P. Gomes¹ 

[1] ,UFCG UAF Engenharia de ProcessosCampina Grande PB

关键词: drying kinetics;    algorithm optimization;    diffusion;    porous media;    cinética de secagem;    algoritmo de otimização;    difusão;    meios porosos;   

DOI  :  10.1590/S0100-69162012000200014

来源: SciELO

【 摘 要 】

In this article, a methodology is used for the simultaneous determination of the effective diffusivity and the convective mass transfer coefficient in porous solids, which can be considered as an infinite cylinder during drying. Two models are used for optimization and drying simulation: model 1 (constant volume and diffusivity, with equilibrium boundary condition), and model 2 (constant volume and diffusivity with convective boundary condition). Optimization algorithms based on the inverse method were coupled to the analytical solutions, and these solutions can be adjusted to experimental data of the drying kinetics. An application of optimization methodology was made to describe the drying kinetics of whole bananas, using experimental data available in the literature. The statistical indicators enable to affirm that the solution of diffusion equation with convective boundary condition generates results superior than those with the equilibrium boundary condition.

【 授权许可】

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