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Distribution of Vapor Pressure in the Vacuum Freeze-Drying Equipment

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  • Shiwei Zhang
  • Jun Liu

Abstract

In the big vacuum freeze-drying equipment, the drying rate of materials is uneven at different positions. This phenomenon can be explained by the uneven distribution of vapor pressure in chamber during the freeze-drying process. In this paper, a mathematical model is developed to describe the vapor flow in the passageways either between material plates and in the channel between plate groups. The distribution of vapor pressure along flow passageway is given. Two characteristic factors of passageways are defined to express the effects of structural and process parameters on vapor pressure distribution. The affecting factors and their actions are quantitatively discussed in detail. Two examples are calculated and analyzed. The analysis method and the conclusions are useful to estimate the difference of material drying rate at different parts in equipment and to direct the choice of structural and process parameters.

Suggested Citation

  • Shiwei Zhang & Jun Liu, 2012. "Distribution of Vapor Pressure in the Vacuum Freeze-Drying Equipment," Mathematical Problems in Engineering, Hindawi, vol. 2012, pages 1-10, July.
    • Handle: RePEc:hin:jnlmpe:921254
    DOI: 10.1155/2012/921254
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    Cited by:

    1. Yiqiang Liu & Yanhua Tian & Yijian He, 2024. "Exploratory Testing of Energy-Saving Characteristics of Large-Scale Freeze-Drying Equipment," Energies, MDPI, vol. 17(4), pages 1-11, February.

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