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INVESTIGATION OF THE BEHAVIOUR OF DISSOLVED GASES DURING FREEZING.

Author(s) : LIPP G.

Type of article: Article

Summary

NUCLEATION OCCURS WHEN STATIONARY GROWTH CONDITIONS IN THE SOLUTION ARE REACHED. THE MEASURED OVERSATURATION IS CLOSE TO 20. IN HIGHLY SATURATED GAS SOLUTIONS, DENDRITIC BREAKDOWN OF THE PLANAR ICE-WATER INTERFACE DUE TO GAS ENRICHMENT COULD BE OBSERVED. AT THESE POSITIONS ALSO A CONSIDERABLE DEGREE OF CONSTITUTIONAL SUPERCOOLING WAS FOUND. BUBBLES WERE NUCLEATED IN INTERDENDRITIC SPACES. THE GROWTH KINETICS OF THE BUBBLES AND THEIR MAXIMUM SIZE ARE GOVERNED BY THE VELOCITY OF THE ICE-WATER INTERFACE. DURING GROWTH THE GAS BUBBLES ARE PUSHED AND PARTIALLY ENCAPSULATED, UNTIL THEY REACH A RADIUS IN THE ORDER OF MAGNITUDE OF THE DIFFUSION BOUNDARY LAYER OF THE CONCENTRATION PROFILE, AND BECOME TOTALLY ENGULFED BY THE SOLID PHASE.

Details

  • Original title: INVESTIGATION OF THE BEHAVIOUR OF DISSOLVED GASES DURING FREEZING.
  • Record ID : 1988-1676
  • Languages: English
  • Source: Cryobiology - vol. 24 - n. 6
  • Publication date: 1987

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