Condensation Heat Transfer on Enhanced Surface Tubes: Experimental Results and Predictive Theory-Reference-Cited by-同舟云学术

Condensation Heat Transfer on Enhanced Surface Tubes: Experimental Results and Predictive Theory

Published:2002-07-16 Issue:4 Volume:124 Page:754-761
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Belghazi M.¹,Bontemps A.²,Marvillet C.¹

Affiliation:

1. Groupement pour la Recherche sur les Echangeurs Thermiques (GRETh), CEA Grenoble, 17, avenue des martyrs, 38054 Grenoble cedex 9, France

2. Laboratoire des Ecoulements Ge´ophysiques et Industriels (LEGI/GRETh), Universite´ Joseph Fourier, Grenoble, France, CEA Grenoble, 17, avenue des martyrs, 38054 Grenoble cedex 9, France

Abstract

Condensation heat transfer in a bundle of horizontal enhanced surface copper tubes (Gewa C+ tubes) has been experimentally investigated, and a comparison with trapezoidal shaped fin tubes with several fin spacing has been made. These tubes have a specific surface three-dimensional geometry (notched fins) and the fluids used are either pure refrigerant (HFC134a) or binary mixtures of refrigerants (HFC23/HFC134a). For the pure fluid and a Gewa C+ single tube, the results were analyzed with a specifically developed model, taking into account both gravity and surface tension effects. For the bundle and for a pure fluid, the inundation of the lowest tubes has a strong effect on the Gewa C+ tube performances contrary to the finned tubes. For the mixture, the heat transfer coefficient decreases dramatically for the Gewa C+ tube.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/124/4/754/5913603/754_1.pdf

Reference30 articles.

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