Condensation of Refrigerants in Horizontal, Spirally Grooved Microfin Tubes : Numerical Analysis of Heat Transfer in The Annular Flow Regime  

Oleh:

Honda, H. ; Nozu, S.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 122 no. 1 (Feb. 2000), page 80-91.
Topik: Regime; condensation; refrigerants; horizontal; spirally grooved; microfin tubes; numerical analysis; heat transfer; annular flow regime

Ketersediaan

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

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Isi artikel

A method is presented for estimating the condensation heat transfer coefficient in a horizontal, spirally grooved microfin tube. Based on the flow observation study performed by the authors, a laminar film condensation model in the annular flow regime is proposed. The model assumes that all the condensate flow occurs through the grooves. The condensate film is segmented into thin and thick film regions. In the thin film region formed on the fin surface, the condensate is assumed to be drained by the combined surface tension and vapor shear forces. In the thick film region formed in the groove, on the other hand, the condensate is assumed to be driven by the vapor shear force. The present and previous local heat transfer data including four fluids (CFC11, HCFC22, HCFC123, and HFC134a) and three microfin tubes are found to agree with the present predictions to a mean absolute deviation of 15.1 percent.

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