Critical Heat Fluxes of Subcooled Water Flow Boiling Against Outlet Subcooling in Short Vertical Tube  

Oleh:

Hata, Koichi ; Shiotsu, Masahiro ; Noda, Nobuaki

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 126 no. 3 (Jun. 2004), page 312-320.
Topik: TUBES; heat fluxes; subcooled water flow; boiling; outlet; short vertical tube

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.8 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

The critical heat fluxes (CHF s) of subcooled water flow boiling are systematically measured for the flow velocities (u = 4.0 to 13.3 m / s), the outlet subcoolings (Tsub,out = 3 to 129 K) and the outlet pressure (Pout = 800 kPa). The SUS304 test tubes of 3, 6, 9 and 12 mm in inner - diameter, d, and 33, 66, 99 and 133 mm in length, L, respectively for L / d = 11 are used. The CHFs first become lower and then become higher with the increase in subcooling. The CHFs for four different inner - diameters with L / d = 11 measured here become higher with the decrease in the diameter. CHF correlation for the latter increasing regime was given in non - dimensional form against average outlet subcoolings based on the experimental data. The correlation can describe not only the CHF s obtained in this work at the outlet pressure of 800 kPa but also the authors' published CHF s (1284 points) for the wide range of Pout = 159 kPa to 1 MPa, d = 6, 9 and 12 mm, L = 49, 99 and 149 mm, AT(sub,out) = –4 to 140 K and u = 4.0 to 13.3 m / s within 15 % difference for 50 K <= AT(sub,out) <= 140 K and within –10 to + 30% for 30 K < AT(sub,out) < 50 K.

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