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AN EXPERIMENTAL STUDY OF NATURAL CONVECTION EFFECTS ON DOWNWARD FREEZING OF PURE WATER.

Author(s) : BREWSTER R. A., GEBHART B.

Type of article: Article

Summary

THE COUPLED MECHANISMS OF CONVECTION AND FREEZING WERE SHOWN TO BE VERY COMPLICATED. PREVIOUS COMPARABLE STUDIES HAVE BEEN LIMITED TO SMALL AND VERY CONFINED GEOMETRIES. THE PRESENT LARGER SCALE MEASUREMENTS DETERMINED BOTH FREEZING AND CONVECTIVE HEAT TRANSFER RATES. NON-FREEZING MEASUREMENTS WERE ALSO MADE, TO CHARACTERIZE THE PURELY CONVECTIVE EFFECTS. TIME-EXPOSURE VISUALIZATIONS OF TYPICAL FLOWS ARE GIVEN FOR AMBIENT WATER TEMPERATURES IN THE RANGE OF 274-282 K (1-9 DEG C). THE DENSITY ANOMALY IN COLD WATER HAS VERY LARGE EFFECTS ON BOTH THE FLOWS AND FREEZING RATES. LARGE LIQUID SUPERCOOLING ALWAYS PRECEDED INITIAL FREEZING. RESULTING TRANSIENT CHANGES IN THE BUOYANCY FORCE WERE FOUND TO HAVE LARGE EFFECTS UNDER MANY CONDITIONS. MEASUREMENTS OF ICE THICKNESSES AND COOLING SURFACE TEMPERATURES ARE USED TO CALCULATE HEAT TRANSFER COEFFICIENTS AND ICE GROWTH < EFFICIENCIES >.

Details

  • Original title: AN EXPERIMENTAL STUDY OF NATURAL CONVECTION EFFECTS ON DOWNWARD FREEZING OF PURE WATER.
  • Record ID : 1989-0063
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 31 - n. 2
  • Publication date: 1988

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