When convective hot air is
equal to or greater than 1 m/s, external resistances become neg-
ligible (Jason, 1958). Srikiatden and Roberts (2006) showed that
the Biot number for mass transfer for 0.7 cm samples was in
the range of 1.44 104
9.70 104
using an air velocity above
1.5 and air temperatures between 50 and 70 C