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

Oleh:

Marvillet, C. ; Bontemps, A. ; Belghazi, M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 124 no. 4 (Aug. 2002), page 754-761.
Topik: condensation; condensation; heat transfer; surface tubes; experimental results; predictive theory

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.5 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

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.

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