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HIGH HEAT FLUX KAPITZA CONDUCTANCE OF TECHNICAL COPPER WITH SEVERAL DIFFERENT SURFACE PREPARATIONS.

Author(s) : KASHANI A., SCIVER S. W. van

Type of article: Article

Summary

KAPITZA CONDUCTANCE VALUES OF TECHNICAL COPPER WITH DIFFERENT SURFACE TREATMENTS AND FOR HEAT FLUXES OF UP TO 6 W/CM2 ARE REPORTED. FIVE DIFFERENT SURFACE PREPARATIONS WERE STUDIED: A. POLISHED WITH 0.3 MICROMETER ALUMINA POWDER ; B. OXIDIZED AT ROOM TEMPERATURE IN AIR FOR A PERIOD OF ONE MONTH ; C. OXIDIZED IN AIR AT 473 K (200 DEG C) FOR 40 MIN ; D. COATED WITH 50-50 LEAD-TIN SOLDER ; E. COATED WITH A LAYER OF GE7031 VARNISH. THE VARIATION OF SURFACE TEMPERATURE WITH HEAT FLUX AS WELL AS THE LIMITING VALUES OF KAPITZA CONDUCTANCE FOR SMALL TEMPERATURE DIFFERENCE ARE DETERMINED. BAKED AND SOLDER COATED SAMPLES HAVE HIGHER CONDUCTANCES. THE SURFACE TEMPERATURE OF THE VARNISHED SAMPLES IS CONTROLLED MOSTLY BY THE LOW THERMAL CONDUCTIVITY OF THE VARNISH.

Details

  • Original title: HIGH HEAT FLUX KAPITZA CONDUCTANCE OF TECHNICAL COPPER WITH SEVERAL DIFFERENT SURFACE PREPARATIONS.
  • Record ID : 1986-0027
  • Languages: English
  • Source: Cryogenics - vol. 25 - n. 5
  • Publication date: 1985

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