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THE INFLUENCE OF THE FREEZING PROCESS ON VAPOUR TRANSPORT DURING SUBLIMATION IN VACUUM-FREEZE-DRYING.

Author(s) : KOCHS M.

Type of article: Article

Summary

THE INFLUENCE OF THE FREEZING PROCESS ON MASS TRANSFER DURING SUBSEQUENT SUBLIMATION IN AN AQUEOUS POLYMER SOLUTION WAS INVESTIGATED. DIFFERENT TEXTURES OF THE FROZEN SAMPLE DEPENDING ON THE SOLIDIFICATION PARAMETERS AND THE TEXTURE DEPENDENT DIFFUSION COEFFICIENT FOR VAPOUR TRANSPORT OUT OF THE FROZEN, DRYING SAMPLE WERE STUDIED. EXPERIMENTS WERE PERFORMED, USING A CONTROLLED DIRECTIONAL SOLIDIFICATION METHOD (BRIDGMAN TECHNIQUE) AND ISOTHERMAL SUBLIMATION, ANALYSED THROUGH A LIGHT MICROSCOPE. THE DEPENDENCE OF THE < ICE FINGER > PRIMARY SPACING WITH THE SOLIDIFICATION PARAMETERS IS SHOWN. A PROPORTIONALITY BETWEEN THIS COMBINATION OF FREEZING PARAMETERS AND THE DIFFUSION COEFFICIENT FOR VAPOUR TRANSPORT DURING SUBLIMATION WAS CONFIRMED BY THE EXPERIMENTS.

Details

  • Original title: THE INFLUENCE OF THE FREEZING PROCESS ON VAPOUR TRANSPORT DURING SUBLIMATION IN VACUUM-FREEZE-DRYING.
  • Record ID : 1992-0898
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 34 - n. 9
  • Publication date: 1991/09

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