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Drying characteristics of starch in an inert medium fluidized bed
Author(s) -
Lee DongHyun,
Kim SangDone
Publication year - 1993
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270160409
Subject(s) - inert , fluidized bed , inert gas , starch , particle size , chemical engineering , materials science , chemistry , volumetric flow rate , dimensionless quantity , chromatography , thermodynamics , composite material , organic chemistry , physics , engineering
The effects of gas velocity (0.32 to 0.67 m/s), inlet gas temperature (25 to 100 °C) and the mass ratio of starch to inert particles (0.1 to 0.4) on the drying rate of starch in a 0.083 m‐ID × 0.80 m‐high inert medium fluidized bed were investigated. The drying mechanism in an inert medium fluidized bed can be classified into adhesion‐dispersion, evaporation and disintegration steps. The drying rate increases with the increasing inlet gas temperature and velocity; the rates being about 10 times those reported for an agitated pan dryer. However, the drying rate decreases slightly as the mass ratio of starch to inert particles increases. Also, the drying rate exhibits a maximum at an optimum bed porosity. The drying rate data obtained in an inert medium fluidized bed have been correlated with the relevant dimensionless groups, i.e. Stefan and particle Reynolds numbers based on the theory of isotropic turbulence.