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MEASURING FIN-TUBE CONTACT RESISTANCES IN A COMPACT EXCHANGER. APPLICATION TO NON-DESTRUCTIVE TESTING.

MESURE DES RESISTANCES DE CONTACT AILETTE-TUBE DANS UN ECHANGEUR COMPACT. APPLICATION AU CONTROLE NON DESTRUCTIF.

Author(s) : L'HOTE P., BARDON J. P.

Type of article: Article

Summary

IN THIS METHOD, THE PHENOMENON OF NUCLEATE BOILING IS USED ON FINS WHICH ARE SOLDERED OR CRIMPED ONTO THE TUBES. IDENTIFYING THERMAL CONTACT RESISTANCE ON A FINNED LENGTH IS ACHIEVED BY COMPARING THE MEASURED VALUE OF OVERALL FIN-TUBE RESISTANCE WITH THAT GIVEN BY A THEORETICAL MODEL. THE TEST DEVICE USES WATER AND R11 IN, RESPECTIVELY, THE INTERIOR AND EXTERIOR OF THE FINNED TUBES. THE LOCAL MEASUREMENT OF THE OVERALL FIN-TUBE RESISTANCE IS DEDUCED FROM THE MEASUREMENT OF THE MASS FLOW RATE OF R11 VAPOUR GENERATED AND FROM THE TEMPERATURE DIFFERENCE BETWEEN THE 2 FLUIDS. THE METHOD TURNS OUT TO BE VERY SENSITIVE.

Details

  • Original title: MESURE DES RESISTANCES DE CONTACT AILETTE-TUBE DANS UN ECHANGEUR COMPACT. APPLICATION AU CONTROLE NON DESTRUCTIF.
  • Record ID : 1990-1396
  • Languages: French
  • Source: Rev. gén. Therm. - vol. 28 - n. 334
  • Publication date: 1989

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