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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v5.i4.50
pages 265-277

Enhancement of Evaporating Heat Transfer in a Horizontal Tube Using Annular Crevices

J. S. Kim
Department of Refrigeration and Air Conditioning Engineering, Pukyong National University, 599-1, Daeyeon 3 dong, Nam-ku, Pusan 508-737, Korea
S. C. Bae
Department of Refrigeration and Air Conditioning Engineering, Pukyong National University, 599-1, Daeyeon 3 dong, Nam-ku, Pusan 508-737, Korea
J. H. Kim
Department of Refrigeration and Air Conditioning Engineering, Pukyong National University, 599-1, Daeyeon 3 dong, Nam-ku, Pusan 508-737, Korea
I. S. Jang
Department of Building Equipment and Systems, Yangsan College, 105-1 Myunggut dong, Yangsan, Kyungnam 626-040, Korea

RÉSUMÉ

Flow boiling heat transfer characteristics in a horizontal tube under a small heat flux are important both for refrigeration equipment and for the recovery of low temperature waste heat. In the present study, five kinds of annular creviced turbulence promoters with unique configurations were produced to improve the evaporation heat transfer in a horizontal tube. Their heat transfer performances were experimentally investigated in comparison with a smooth tube using a horizontal evaporating tube with a visual observatory. Tests were run with CFC-12 with an evaporating temperature of 15°C, a mass flux of 50 kg/m2s and 100 kg/m2s, a heat flux of 3.4 kW/m2 and 6.7 kW/m2, and a quality of 0.1−0.5. The local heat transfer coefficient tended to be an improvement over that of the smooth tube. These kinds of turbulence promoters are effective for boiling heat transfer enhancement under a small heat flux and a low mass flux. The enhancement ratio of the heat transfer was 130 to 170% in the test ranges.


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