Drying ’85 pp 268-274 | Cite as

Freeze-Drying Mechanisms and Drying Rates Under Various Drying Conditions

  • Masashi Asaeda
  • Masanobu Hara


Freeze-drying rates of relatively homogeneous frozen materials and frozen particles in a shallow tray by radiative and conductive heating are studied both experimentally and theoretically. The drying mechanism of frozen materials of which initial ice content is less than 1.0 is quite different from the flat plane sublimation, which was found previously by one of the authors to become unstable under some conditions. The total drying times under various conditions are discussed for this kind of frozen materials and also for a packed bed of frozen particles using dimensionless heat and mass transfer equations to obtain some information for shorter drying time.


Heating Plate Interparticle Space Mass Transfer Equation Freeze Material Freeze Front 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • Masashi Asaeda
    • 1
  • Masanobu Hara
    • 1
  1. 1.Department of Chemical EngineeringHiroshima UniversityHigashi-Hiroshima, 724Japan

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