ฉัisolated mass of liquid, where surface driving forces
related to heat and mass transfer are constant, leading
to the constant rate period. When the internal resistance
to the transport of liquid water to the surface
increases, thereby lowering the drying rate, the falling
rate period occurs. Hence, internal diffusion may be
assumed to be the mechanism responsible for water
loss during the drying process. At lower drying temperatures
a more uniform moisture distribution exists,
that allow the sample to continue to shrink until the
last stages of drying with a low porosity. On the contrary,
at higher air temperatures, case hardening of the
surface may occur and the volume of the sample
becomes fixed at an earlier stage, inducing less shrinkage
and a more intensive pore formation (Bonazzi &
Dumoulin, 2011).
ฉัisolated mass of liquid, where surface driving forcesrelated to heat and mass transfer are constant, leadingto the constant rate period. When the internal resistanceto the transport of liquid water to the surfaceincreases, thereby lowering the drying rate, the fallingrate period occurs. Hence, internal diffusion may beassumed to be the mechanism responsible for waterloss during the drying process. At lower drying temperaturesa more uniform moisture distribution exists,that allow the sample to continue to shrink until thelast stages of drying with a low porosity. On the contrary,at higher air temperatures, case hardening of thesurface may occur and the volume of the samplebecomes fixed at an earlier stage, inducing less shrinkageand a more intensive pore formation (Bonazzi &Dumoulin, 2011).
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