CARMO, J. E. F.; http://lattes.cnpq.br/2795050364498796; CARMO, João Evangelista Franco do.
Résumé:
A numerical solution of the diffusion equation to describe mass transfer inside oblate
spheroids, considering diffusion coefficient and constant or convective boundary
condition, are presented. The diffusion equation in oblate spheroidal coordinate system
was used, in a two dimensional case, and the finite-volume method was applied to
discretize the basic equation. The set of equation was solved iteratively using the Gauss-
Seidel method. In application various results for various aspect ratios, are presented. The
effects of the Fourier, Biot number and the aspect ratio of body on the drying rate, mean
moisture content and moisture content distribution during the process are presented and
analyzed. To investigate the effect of the aspect ratio only, different results of the average
moisture content are showed. The results show that the model is consistent and it may be
used to solve diffusion problems such as drying, wetting, heating and cooling in oblate
spheroidal solids, including circular disk and sphere.