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Emissivity measurement of PbLi droplets in a vacuum for heat recovery by radiation
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.fusengdes.2020.111961
Fumito Okino , Satoshi Konishi

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.

中文翻译:

真空中 PbLi 液滴的发射率测量,用于辐射热回收

摘要 通过红外热成像对真空中液态锂铅(PbLi)液滴的发射率进行了理论分析和验证。作者提出了从真空中下降的 PbLi 液滴中同时回收热量和氚的概念。热交换器中的渗透减少预计会通过真空中的辐射热回收而发生。辐射功率取决于液滴发射率,迄今为止仍未有报道。使用直径为 0.8 mm 的液滴在 400℃下以 3 ms-1 的速度下落进行实验测量。发射率由液滴的红外常温、使用热电偶测量的真实温度和壁温计算得出。施加三种不同的 H2 气体压力(而不是氚)(10-3、10°、和 102 Pa) 在真空室中验证入射氢分子对发射率的影响。获得的发射率分别为 0.35±0.06、0.33±0.06 和 0.36±0.06,高于贵金属。偏差包括随机测量误差和系统误差。入射 H2 分子对发射率没有影响。考虑液滴尺寸效应和停留期延长以实现同时回收热和氚的概念。
更新日期:2020-11-01
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