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- W3080264257 abstract "Abstract The emissivity of a liquid lithium-lead (PbLi) droplet falling in a vacuum is theoretically analyzed and verified by infrared thermal imaging. The authors propose the concept of simultaneous recovery of heat and tritium from falling PbLi droplets in a vacuum. Permeation reduction in a heat exchanger is expected to occur by radiation heat recovery in a vacuum. The radiation power depends on the droplet emissivity, which remains unreported to date. An experimental measurement is performed using 0.8 mm diameter droplets at 400℃, falling with a velocity of 3 m s−1. The emissivity is calculated from the infrared normal temperature of a droplet, the true temperature measured using a thermocouple, and the wall temperature. Three different H2 gas pressures (instead of tritium) are applied (10-3, 10°, and 102 Pa) in a vacuum chamber to verify the effect of incident hydrogen molecules on the emissivity. The obtained emissivities are 0.35 ± 0.06, 0.33 ± 0.06, and 0.36 ± 0.06, respectively, which are higher than those of the precious metals. Deviations include random measurement errors and systematic errors. The incident H2 molecules have no effect on the emissivity. The droplet size effects and the dwell period elongation are to be considered to realize the concept of simultaneous heat and tritium recovery." @default.
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- W3080264257 date "2020-11-01" @default.
- W3080264257 modified "2023-09-23" @default.
- W3080264257 title "Emissivity measurement of PbLi droplets in a vacuum for heat recovery by radiation" @default.
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- W3080264257 doi "https://doi.org/10.1016/j.fusengdes.2020.111961" @default.
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