Effects of operational conditions on drying characteristics in closed superheated steam drying

Citation
Y. Tatemoto et al., Effects of operational conditions on drying characteristics in closed superheated steam drying, DRY TECHNOL, 19(7), 2001, pp. 1287-1303
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemical Engineering
Journal title
DRYING TECHNOLOGY
ISSN journal
0737-3937 → ACNP
Volume
19
Issue
7
Year of publication
2001
Pages
1287 - 1303
Database
ISI
SICI code
0737-3937(2001)19:7<1287:EOOCOD>2.0.ZU;2-I
Abstract
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.