Y. Tatemoto et al., Effects of operational conditions on drying characteristics in closed superheated steam drying, DRY TECHNOL, 19(7), 2001, pp. 1287-1303
The effects of operational conditions on the drying performance in closed s
uperheated steam drying were examined theoretically and experimentally. The
vapor generated from the sample was circulated in the drying chamber. In t
he theoretical analysis, the replacement of air with vapor in drying chambe
r and the convective vapor transfer in sample were considered. At the start
of drying, the drying chamber was filled with air. As the drying proceeded
, the air was replaced with the vapor generated from sample. The calculated
results explained the characteristics of experimental data. The pore diame
ter of sample had little effect on the drying characteristics. During the i
nternal evaporation period, the evaporation occurred in the narrow zone, wh
ich moved from the surface to the bottom of sample. The convective vapor tr
ansfer in sample had a significant influence on the drying performance. The
excess increments in temperature and velocity of drying gas hardly contrib
uted to shortening the drying time.