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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

CRITICAL HEAT FLUX ON SINGLE HORIZONTAL WIRES IN SUPERFLUID HELIUM AT PRESSURES

Masahiro Shiotsu
Institute of Atomic Energy, Kyoto University Uji, Kyoto, Japan

Koichi Hata
Institute of Atomic Energy, Kyoto University Uji, Kyoto, Japan

Y. Takeuchi
Institute of Atomic Energy, Kyoto University Uji, Kyoto, Japan

K. Hama
Institute of Atomic Energy, Kyoto University Uji, Kyoto, Japan

Akira Sakurai
Institute of Atomic Energy, Kyoto University, Uji, Kyoto, Japan

DOI: 10.1615/IHTC10.4710
pages 141-146

Sinopsis

Critical heat fluxes on single horizontal test wires with diameters of 0.08, 0.2, 0.3, 0.5, 0.7 and 1.2 mm in a pool of superfluid helium (He II) were measured for liquid temperatures ranging from 1.80 to 2.15 K at pressures from each saturated to atmospheric. Critical heat flux, qCT for a test wire under a saturated condition becomes higher for higher liquid head above the wire. The qCT value for a fixed liquid head increases with decreasing bulk liquid temperature, Tb, from λ temperature (He II − He I transition temperature) and has a maximum value at around Tb = 2 K and gradually decreases with further decreasing Tb. The qCT value under a subcooled condition at a pressure higher than the λ pressure becomes higher with decreasing Tb. The qCT value for a fixed Tb is lower for larger wire diameter. It was confirmed that the authors' theoretical CHF equation can describe well the experimental data of qCT for wide ranges of conditions tested here.

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