Issue
Korean Journal of Chemical Engineering,
Vol.12, No.3, 325-330, 1995
DRYING OF FLUIDIZED MATERIALS IN A CENTRIFUGAL FLUIDIZED BED
Drying characteristics of the fluidzed food materials such as rice, potato and carrot have been investigated in a centrifugal fluidized bed whose effective length and diameter have been 0.2m and 0.1m, respectively. The effects of air velocity and initial moisture content on the hydrodynamics and drying rate have been determined. The pressure drop has exhibited a maximum in the relatively thicker bed, while it has showed a plateau in the relatively thinner bed, with an increases in the air velocity. The drying rate has been increased with increases in the initial moisture content of the materials and air velocity. The variation of drying rate with respect to the moisture content has been almost linear at the falling rate period, and it has been well correlated by means of the rotational power acting on the bed.
[References]
  1. Bird RB, Stewart WE, Lightfoot EN, "Transport Phenomena," John Wiley & Sons, Inc., N.Y., 1960
  2. Chen YM, AIChE J., 33, 722, 1987
  3. Fan LT, Energy Commun., 4, 509, 1978
  4. Fan LT, Chang CC, Yu YS, Takahashi T, Tanaka Z, AIChE J., 31, 999, 1985
  5. Kao J, Pfeffer R, Tardos GI, AIChE J., 33, 858, 1987
  6. Kang Y, Shim JS, Choi MJ, Lee KW, Kim SD, "Drying of Thermally-Weak Powder in a Centrifugal Fluidized-Bed Dryer," Proc. 4th Asian Conf. on Cluidized Beds and Three Phase Reactors, Fukuoka, Japan, November 28-30, 67, 1994
  7. Kroger DG, Levy EK, Chen JC, Powder Technol., 24, 9, 1979
  8. Lee DH, "Drying Characteristics of Fine Powders in a Media Fluidized Bed," Ph.D. Thesis, KAIST, 1994
  9. Levy EK, Doege C, Chen J, "Parametric Analysis of a Centrifugal Fluidized Bed Coal Combustor," Proceeding of the ASME-AIChE Heat Transfer Conference, St. Louis, August 9-11, 1976
  10. Mujumdar AS, Handbook of Industrial Drying, Marcel Dekker, Inc., N.Y., 1987
  11. Takahashi T, Tanaka Z, Itoshima A, Fan LT, J. Chem. Eng. Jpn., 17, 333, 1984