Detail Bubble Dynamic Parameters and Pool Boiling Heat Transfer on Plasma Coated Tubes in Saturated R-134a and R-600a   Oleh:  Hsieh, Shou-Shing ; Ke, Chung-Guang Jenis: Article from Bulletin/Magazine Dalam koleksi: Journal of Heat Transfer vol. 124 no. 4 (Aug. 2002), page 704-716. Topik: plasma processes; bubble dynamic parameters; pool boiling; plasma coated tubes Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.5 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel An optical method for measuring the bubble dynamic data subject to an isolated bubble model is presented at low heat flux (q <= 1 kW/m(2)) ; while the operating heat fluxes are up to 30 kW/m(2). By simultaneous measurements of departure diameters, velocities, frequencies and nucleation site densities, the heat transfer contribution of an individual active site is evaluated. A single phase heat transfer correlation was used to model the present heat transfer data. The test specimens consisted of tubes with porous copper (Cu) and molybdenum (Mo) plasma coated surfaces. The porosity (E), the thickness of the porous layer (d), and the mean pore diameter (n) of the tested tubes are the following : 0.055 <= E <= 0.057, 100 <= d <= 300 µm, and 3 <= n <= 4 µm. The tests were carried out using R-134a and R-600a as working fluid at a saturation temperature of 18° C and with low and moderate heat fluxes (<= 1 kW/m2) for boiling visualization and related measurements (<= 30 kW/m2). Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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