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- W137752351 abstract "In this study, quenching experiments were performed to examine the effect of inclination angles and curvature on film boiling heat transfer. The experiments employed a stainless steel downward-facing hemisphere with diameter 294 mm and thickness 30 mm to substantiate the local film boiling mechanism along the angular surface. Forty six thermocouples were installed from 0 deg (the bottom) to 85 deg (near the equator) at three intervals - 10 deg (0 deg {approx} 10 deg), 5 deg (10 deg {approx} 55 deg), 2.5 deg (55 deg {approx} 85 deg) - near the outer (1.5 mm) and inner (5 mm) surfaces of the test section. The angular film boiling heat transfer coefficients were obtained from the two-dimensional transient temperature profiles by solving transient heat conduction equation in the spherical coordinates. The test results were compared with those of the laminar and interfacial wavy film boiling analysis. Undulating heat transfer coefficients were observed from the experimental data as the angle increases. These phenomena aggravated near the equator which has higher inclination angles than near the bottom because the Helmholtz instability limited the vapor film thickness. In addition, the boiling mechanism on the downward-facing hemisphere was visualized utilizing a digital camera. An empiricalmore » correlation was derived for application to the APR1400 (Advanced Power Reactor 1400 MWe) external reactor vessel cooling. (authors)« less" @default.
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- W137752351 date "2007-03-01" @default.
- W137752351 modified "2023-10-16" @default.
- W137752351 title "Azimuthal Film-Boiling Heat Transfer from a Downward-Facing Hemisphere" @default.
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- W137752351 doi "https://doi.org/10.13182/nt07-a3817" @default.
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