Critical Heat Fluxes of Subcooled Water Flow Boiling Against Outlet Subcooling in Short Vertical Tube
Author:
Hata Koichi1, Shiotsu Masahiro2, Noda Nobuaki3
Affiliation:
1. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan 2. Dept. of Energy Science and Technology, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan 3. National Institute for Fusion Science, 322-6, Oroshi-cho, Toki, Gifu 509-5292, Japan
Abstract
The critical heat fluxes (CHFs) of subcooled water flow boiling are systematically measured for the flow velocities (u=4.0 to 13.3 m/s), the outlet subcoolings (ΔTsub,out=3 to 129 K) and the outlet pressure Pout=800kPa. 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 CHFs obtained in this work at the outlet pressure of 800 kPa but also the authors’ published CHFs (1284 points) for the wide range of Pout=159kPa to 1 MPa, d=6, 9 and 12 mm, L=49, 99 and 149 mm, ΔTsub,out=−4 to 140 K and u=4.0 to 13.3 m/s within 15% difference for 50K⩽ΔTsub,out⩽140K and within −10 to +30% for 30K<ΔTsub,out<50K.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference18 articles.
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