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TRANSIENT NATURAL CONVECTION IN ENCLOSURES AT HIGH RAYLEIGH NUMBER.

Author(s) : OLSON D. A., GLICKSMAN L. R.

Type of article: Article

Summary

TRANSIENT NATURAL CONVECTION AT RAYLEIGH NUMBERS OF 10 BILLIONS WAS STUDIED EXPERIMENTALLYIN 2 ENCLOSURES OF ASPECT RATIO 1/3, ONE A 1:5.5 PHYSICAL SCALE MODEL CONTAINING THE DENSE REFRIGERANT GAS R114, AND THE SECOND A FULL-SCALE ROOM CONTAINING AIR. IN ONE TYPE OF TRANSIENT THE VERTICAL ENDWALL TEMPERATURE WAS SUDDENLY CHANGED, WHILE IN A SECOND TYPE OF TRANSIENT THE ISOTHERMAL, WELL-MIXED GAS WAS SUDDENLY EXPOSED TO HOT AND COLD VERTICAL ENDWALLS. THE EXPERIMENTS INDICATED THAT THE DOMINANT TIME CONSTANT WAS A CONVECTIVE ONE. COMPARISONS BETWEEN THE SCALE MODEL AND FULL SCALE SHOW THAT R114 GAS CAN SIMULATE THE TRANSIENT BEHAVIOUR OF AIR-FILLED ENCLOSURES.

Details

  • Original title: TRANSIENT NATURAL CONVECTION IN ENCLOSURES AT HIGH RAYLEIGH NUMBER.
  • Record ID : 1992-1057
  • Languages: English
  • Source: J. Heat Transf. - vol. 113 - n. 3
  • Publication date: 1991/08
  • Document available for consultation in the library of the IIR headquarters only.

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