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Micro-CT scanning study on effect factors of sublimation interface during freeze-drying.

Author(s) : XIAO X., TAO L., XI D. C., et al.

Summary

A Micro-CT scanner has been used to follow the moving interface during sublimation. Apple slices used as experimental samples were scanned at certain intervals when drying. The scanning images were analysed, then variation curves of grey value were obtained. For different thicknesses, freezing rates and primary drying temperatures, the different sublimation phenomena were compared. The results show that heat and mass exchange occurs both at the upper and the under surfaces of the sample. Also the exchange occurs on the side surface to some extent. To thick samples, the interface showing as a three-dimensional moving mode contracts to the geometric centre of the sample and presents approximate globosity. Samples frozen of slow freezing sublimate more quickly than those of quick freezing. The higher the primary drying temperature is, the more quickly sublimation interface moves. However, samples shrink and collapse more severely with high drying temperature under quick-freezing condition.

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Pages: ICR07-C1-1299

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Details

  • Original title: Micro-CT scanning study on effect factors of sublimation interface during freeze-drying.
  • Record ID : 2008-0958
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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