EFFECTS OF OPERATIONAL CONDITIONS ON DRYING CHARACTERISTICS IN CLOSED SUPERHEATED STEAM DRYING

Autor:	Masahito Shibata, Yasuhiro Sugimura, Koji Oyama, Keiji Yasuda, Yoshiyuki Bando, Yuji Tatemoto, Masaaki Nakamura
Rok vydání:	2001
Předmět:	Convection Pore diameter Chromatography Drying time Chemistry General Chemical Engineering Superheated steam Evaporation food and beverages Physical and Theoretical Chemistry Composite material complex mixtures
Zdroj:	Drying Technology. 19:1287-1303
ISSN:	1532-2300 0737-3937
DOI:	10.1081/drt-100105289
Popis:	The effects of operational conditions on the drying performance in closed superheated steam drying were examined theoretically and experimentally. The vapor generated from the sample was circulated in the drying chamber. In the theoretical analysis, the replacement of air with vapor in drying chamber 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 diameter of sample had little effect on the drying characteristics. During the internal evaporation period, the evaporation occurred in the narrow zone, which moved from the surface to the bottom of sample. The convective vapor transfer in sample had a significant influence on the drying performance. The excess increments in temperature and velocity of drying gas hardly contributed to shortening the drying time.
Databáze:	OpenAIRE
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