If the mass transfer Biot number is infinite and, consequently,
the boundary condition is of the first kind, the diffusion process
is also described by Eq. (3). In this case (Bi?1), Eq. (4) is written
in the following way: Bn ¼ 4=l2n
and the roots ln are calculated
from Eq. (6), with, Bi?1 resulting in J0(ln) = 0.
In order to determine the effective mass diffusivity D for a given
experimental dataset, the optimization algorithm proposed by
Silva et al. (2009) was used in the present work, using 200 terms
of the series given in Eq. (3).