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IIR document

Effect of various freezing rate on freeze-drying process of water diagnosed by ultrasonic technology.

Number: pap. n. 1765

Author(s) : CHENG C., TSENG Y. H., CHENG H. P.

Summary

In this paper, an ultrasonic transducer (UT) is integrated onto the bottom of a specially designed frozen bottle for the purpose of monitoring the freeze-drying process of water under various freezing rate. The temperature and visual observation made with a camera are then compared with the corresponding ultrasonic signature. In order to evaluate the various freezing rate, two kinds of freeze-drying processes are designed. The temperature and ultrasonic signals indicated the phase change of cooling and freezing periods. These two periods are shorter when the shelf temperature is set at a lower value. However, only ultrasonic signals indicate the phase change of drying period. The visual observation indicates that the lower shelf temperature setting results in the smaller ice crystal nuclei. This study demonstrates an innovative frozen bottle with an integrated ultrasonic sensor used to measure the freeze-drying process of water under the various freezing rates.

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Pages: 6

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Details

  • Original title: Effect of various freezing rate on freeze-drying process of water diagnosed by ultrasonic technology.
  • Record ID : 30026431
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1765

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