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Experimental study of the effects of the spiral angle on evaporative heat transfer enhancement in microfin tubes.

Author(s) : OH S. Y., BERGLES A. E.

Summary

The in-tube evaporative heat transfer of the hydrofluorocarbon R134a was examined for a smooth tube and five microfin tubes. The heat transfer coefficient in the smooth tube was compared with four correlations. The Yoshida correlation was found to be the best in annular flow, and the Kandlikar correlation with FK= 2.33 was the best in stratified flow, but the latter needs clarification for its applicability to the low quality range because of the strong nucleate boiling effect caused by the large value of FK. The effect of the spiral angle of microfin tubes was investigated to determine the optimal spiral angle.

Details

  • Original title: Experimental study of the effects of the spiral angle on evaporative heat transfer enhancement in microfin tubes.
  • Record ID : 1999-3442
  • Languages: English
  • Source: ASHRAE Transactions. 1998 annual Meeting, Toronto, Ontario + CD-ROM.
  • Publication date: 1998
  • Document available for consultation in the library of the IIR headquarters only.

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