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Experimental study on the frost of the cold-trap in vacuum freeze-drying machines.

Author(s) : ZOU T., MIAO Y., SUN Y., et al.

Summary

In vacuum freeze-drying machines, cold-trap is a key part to catch water vapour sublimated from freezing materials. Under low temperature and low-pressure conditions, water vapour directly becomes frost on cold-trap surfaces. But there are few studies on characteristics of frost on cold-trap surfaces, thus it is currently difficult to understand the heat and mass transfer mechanism of a cold-trap and to modify freeze-drying equipments. In this paper, frosting on cold-trap surfaces and freeze material in drying chamber has been investigated by using a dynamic pressure measurement method, studying sublimation rate along with monitoring frost formation process by a camera. Simultaneously, temperature gradient in the frost layers has been analyzed, and then the coefficient of thermal conductivity is obtained according to Fourier law.

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Pages: ICR07-D1-188

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Details

  • Original title: Experimental study on the frost of the cold-trap in vacuum freeze-drying machines.
  • Record ID : 2008-0405
  • 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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