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SOLIDIFICATION OF A BINARY SOLUTION ON A COLD ISOTHERMAL SURFACE.

Author(s) : BRAGA S. L., VISKANTA R.

Type of article: Article

Summary

THE FREEZING OF WATER-SALT SOLUTIONS ON A HORIZONTAL WALL IS INVESTIGATED EXPERIMENTALLY AND THEORETICALLY. THE GROWTH OF THE TWO-PHASE SOLID-LIQUID REGION IS OBSERVED FOR SODIUM CHLORIDE-WATER AND AMMONIUM CHLORIDE-WATER SYSTEMS UNDER DIFFERENT TEMPERATURE AND CONCENTRATION CONDITIONS. A UNIDIRECTIONAL MATHEMATICAL MODEL IS DEVELOPED TO PREDICT THE TEMPERATURE DISTRIBUTION IN A SEMI-INFINITE MEDIUM BASED ON THE ASSUMPTION THAT A LOCAL THERMODYNAMIC EQUILIBRIUM EXISTS BETWEEN THE SOLID AND THE LIQUID IN THE TWO-PHASE REGION. THE MASS DIFFUSION IS NEGLECTED AND THE GROWTH OF THE CRYSTALS IS GOVERNED BY THE TRANSPORT OF HEAT. IN ALL EXPERIMENTS THE SALT CONCENTRATION IN THE SOLUTION IS SMALLER THAN THE EUTECTIC COMPOSITION, AND THE WALL TEMPERATURE IS HIGHER THAN THE EUTECTIC TEMPERATURE.

Details

  • Original title: SOLIDIFICATION OF A BINARY SOLUTION ON A COLD ISOTHERMAL SURFACE.
  • Record ID : 1991-0601
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 33 - n. 4
  • Publication date: 1990/04

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