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FINNED TUBE CONTACT CONDUCTANCE: INVESTIGATION OF CONTACTING SURFACES.

Author(s) : SHEFFIELD J. W., STAFFORD B. D., SAUER H. J. Jr

Summary

SURFACE CHARACTERISTICS OF A FINNED TUBE HEAT EXCHANGER WERE EXAMINED TO HELP PREDICT THE CONTACT GEOMETRY BETWEEN METAL SURFACES. A SCANNING ELECTRON MICROSCOPE WAS USED TO OBSERVE THE SURFACE TOPOGRAPHY OF THE FINS AS WELL AS TO EXAMINE THE CONTACT BETWEEN THE ALUMINIUM FIN AND THE COPPER TUBE. FOR A GIVEN FIN NUMBER, SURFACE ROUGHNESS INCREASED AS THE EXPANSION INCREASED. TESTS REVEALED THAT ONLY A PORTION OF THE FIN COLLAR WAS ACTUALLY IN CONTACT WITH THE TUBE. THESE RESULTS WERE USED TO DEVELOP A MATHEMATICAL MODEL FOR PREDICTING THE HEAT TRANSFER BETWEEN THE FIN AND TUBE.

Details

  • Original title: FINNED TUBE CONTACT CONDUCTANCE: INVESTIGATION OF CONTACTING SURFACES.
  • Record ID : 1986-0522
  • Languages: English
  • Publication date: 1985
  • Source: Source: ASHRAE Trans.
    vol. 91; n. 1A; 442-452; 8 fig.; 11 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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