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EFFECTIVE THERMAL CONDUCTIVITY OF FROST.

Author(s) : AURACHER H.

Summary

ENERGY IS TRANSFERRED IN A FROST LAYER BY MOLECULAR CONDUCTION, BY WATER VAPOUR DIFFUSION, BY RADIATION AND OCCASIONALLY BY NATURAL CONVECTION OF THE PORE GAS. A THEORETICAL AND EXPERIMENTAL STUDY HAS BEEN CARRIED OUT ON THE INFLUENCE OF THESE MECHANISMS. THE TOTAL ENERGY FLUX CAN BE REPRESENTED BY AN EFFECTIVE THERMAL CONDUCTIVITY. THE EQUIVALENT DIFFUSION CONDUCTIVITY IS MAINLY A FUNCTION OF THE LOCAL TEMPERATURE AND THE FROST DENSITY. MEASUREMENTS YIELD AN EQUATION FOR THE DIFFUSION HEAT FLUX. ITS EFFECT ON THE TOTAL HEAT FLUX REACHES RATIOS OF ABOUT 35% AT 273 K (0 DEG C) AND DECREASES WIHDCEI IGNT. EXPERIMENTAL DATA FOR PURE MOLECULAR CONDUCTION ARE PRESENTED. A SIMPLE PORE MODEL IS DEFINED WITH ONE PARAMETER TO BE FITTED TO SUCH DATA. THE RELATIONSHIP FOR THE CONDUCTIVITY DUE TO CONDUCTION IS IN RELATIVELY GOOD AGREEMENT WITH DATA OF AUTHORS.

Details

  • Original title: EFFECTIVE THERMAL CONDUCTIVITY OF FROST.
  • Record ID : 1988-1375
  • Languages: English
  • Publication date: 1986/09/01
  • Source: Source: Proc. int. Symp. Heat Mass Transf. Refrig. Cryog., Dubr.
    285-302; 12 fig.; 30 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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