The comparison between the values of b1 aw1 and
b2 aw2 shows that the higher RH determines the driving force that
causes mass transfer through the film. Inside the diffusion cell,
where RH ¼ 0.02, the films’ surface moistures ranged from about
0.025 to 0.065 g water/g dry solid, while outside the cell, where
RH ¼ 75%, the film’s surface moistures ranged from about 0.38 to
0.89 gwater/g dry solid. The comparison of samples SG20 and SG30
data shows that the increase of Kw was caused partially by the
increase of the diffusion coefficient, Dw (that depends on the film
structure), but mainly by the increase of the solubility coefficient b1
(that depends on the film hygroscopicity). The same reasoning can
be used to explain the Kw increase for samples FG20 and FG30.
The comparison between the values of b1 aw1 andb2 aw2 shows that the higher RH determines the driving force thatcauses mass transfer through the film. Inside the diffusion cell,where RH ¼ 0.02, the films’ surface moistures ranged from about0.025 to 0.065 g water/g dry solid, while outside the cell, whereRH ¼ 75%, the film’s surface moistures ranged from about 0.38 to0.89 gwater/g dry solid. The comparison of samples SG20 and SG30data shows that the increase of Kw was caused partially by theincrease of the diffusion coefficient, Dw (that depends on the filmstructure), but mainly by the increase of the solubility coefficient b1(that depends on the film hygroscopicity). The same reasoning canbe used to explain the Kw increase for samples FG20 and FG30.
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