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Influence of 2.45 GHz microwave radiation supplied with or without intermittency on the size of ice crystals during an innovative freezing process.

Number: pap. n. 1272

Author(s) : ROUAUD O., SADOT M., CHEVALLIER S., et al.

Summary

The objective of this study was to evaluate the ice crystals sizes during a microwave assisted freezing. The process consisted in freezing (with Nitrogen at -45°C) a piece of methylcellulose gel in a rectangular waveguide. 2.45 GHz microwave radiation was supplied in the waveguide according to several duty cycles (0/0.167/0.33/0.5/1). By varying the microwave power, the energy delivered to the product was maintained constant for each experiment. A methodology was developed to evaluate the size of ice crystals by 3D imaging analysis and X-ray micro-tomography. The control freezing condition (no microwave) resulted in the highest mean diameters of ice crystals whereas microwave assisted freezing was able to reduce the size of ice crystals whatever the duty ratio. The ice crystals size could be reduced up to 28% and results tended to show that the reduction was not due to thermal oscillations (duty ratio < 1).

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Details

  • Original title: Influence of 2.45 GHz microwave radiation supplied with or without intermittency on the size of ice crystals during an innovative freezing process.
  • Record ID : 30026342
  • Languages: English
  • 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.2019.1272

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