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Stepwise Change of Operating Pressure in Vacuum Fluidized Bed Drying: An Experimental Study
Author(s) -
Kozanoglu B. U.,
Chanes J. Welti,
Pena A. Gonzalez,
Tolentino D. M. Berlin,
Mancebo M.,
Martinez F.
Publication year - 2005
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450830218
Subject(s) - fluidized bed , thermal diffusivity , chemistry , porosity , mineralogy , materials science , composite material , thermodynamics , physics , organic chemistry
Vacuum‐fluidized bed drying experiments were carried out with porous as well as compact particles, employing distinct operating pressures in two periods of drying, such that the combination of the effects of decrease in the transport capacity of the exterior medium and the enhancement of the internal diffusivity results in favour of the drying process. In a variety of operating conditions, it was observed that in the case of porous particles, increasing the operating pressure during the decreasing drying rate period, after applying a vacuum pressure in the constant drying rate period results in a lower final particle humidity.