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HEAT TRANSFER ENHANCEMENT IN HORIZONTAL, SPIRALLY GROOVED EVAPORATOR TUBES.

Author(s) : YOSHIDA S.

Type of article: Article

Summary

EXPERIMENTAL DATA OF THE CIRCUMFERENTIALLY LOCAL HEAT TRANSFER COEFFICIENT AS WELL AS THE CIRCUMFERENTIALLY AVERAGED COEFFICIENT WERE OBTAINED FOR R22 AND R12 FLOWING AT MASS VELOCITIES OF 50 TO 500 KG/(M2.S), IN 3 TYPES OF SPIRALLY GROOVED EVAPORATOR TUBES ORIENTED HORIZONTALLY. THE HEAT TRANSFER IN THE GROOVED TUBES WAS FOUND TO BE EFFECTIVELY ENHANCED OVER A SMOOTH TUBE AT MASS VELOCITIES LOWER THAN 100 KG/(M2.S), BUT, AS THE MASS VELOCITY INCREASED, THE ENHANCEMENTS WERE RAPIDLY REDUCED, AND THEN THE HEAT TRANSFER COEFFICIENTS GRADUALLY APPROACHED THE VALUE IN A SMOOTH TUBE. A SIMPLIFIED MODEL WAS DEVELOPED.

Details

  • Original title: HEAT TRANSFER ENHANCEMENT IN HORIZONTAL, SPIRALLY GROOVED EVAPORATOR TUBES.
  • Record ID : 1989-0880
  • Languages: English
  • Source: JSME int. J., Ser. II - vol. 31 - n. 3
  • Publication date: 1988/08
  • Document available for consultation in the library of the IIR headquarters only.

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