Detail A Theory of Film Condensation in Horizontal Noncircular Section Microchannels   Oleh:  Rose, John W. ; Hua, Sheng Wang Jenis: Article from Bulletin/Magazine Dalam koleksi: Journal of Heat Transfer vol. 127 no. 10 (Oct. 2005), page 1096-1105. Topik: TUBES; film condensation; non circular section; microchannels Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.10 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel The paper presents a theoretical model to predict film condensation heat transfer from a vapor flowing in horizontal square and equilateral triangular section minichannels or microchannels. The model is based on fundamental analysis which assumes laminar condensate flow on the channel walls and takes account of surface tension, interfacial shear stress, and gravity. Results are given for channel sizes (side of square or triangle) in the range of 0.5 – 5 mm and for refrigerants R134a, R22, and R410A. The cases considered here are where the channel wall temperature is uniform and the vapor is saturated at the inlet. The general behaviour of the condensate flow pattern (spanwise and streamwise profiles of the condensate film), as well as streamwise variation of local mean (over section perimeter) heat - transfer coefficient and vapor mass quality, are qualitatively in accord with expectations on physical grounds. The magnitudes of the calculated heat - transfer coefficients are in general agreement with experimental data for similar, but nonidentical, channel geometry and flow parameters. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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