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Measurement of effective thermal conductivity of lithium metatitanate pebble bed by transient hot-wire technique
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.fusengdes.2020.111718
Maulik Panchal , Abhishek Saraswat , Shrikant Verma , Paritosh Chaudhuri

Abstract In future fusion reactor lithium metatitanate (Li2TiO3) as a functional material in the form of packed pebble beds have been selected in breeding blanket concepts to generate and release tritium. The effective thermal conductivity (keff) of Li2TiO3 pebble beds are needed to be well characterized for the design and analysis of breeding blankets under fusion relevant conditions. The transient hot-wire technique based experimental system has been fabricated, tested and installed for keff measurement of Li2TiO3 pebble beds. Finite element method (FEM) simulations have been performed to optimize the dimension of an experimental setup with the intention of minimizing the uncertainty in keff measurements. The experiments have been performed on 1 ± 0.15 mm diameter Li2TiO3 pebble bed with a packing fraction of 63 %. The influences of temperature (35–800 °C), gas environment (helium and air) and gas pressure (0.105−0.4 MPa (abs.)) have been investigated on keff of Li2TiO3 pebble beds. Reduction in keff was found with a decrease in helium gas pressure while the reduction in keff was not significant with a decrease in air pressure. The measured keff results of Li2TiO3 pebble beds have been compared and agreed well with the literature experimental results. The empirical correlations are also proposed for keff of Li2TiO3 pebble beds in helium and in air environment at 0.105−0.4 MPa and as a function of temperature.

中文翻译:

瞬态热线法测量偏钛酸锂球床有效热导率

摘要 在未来的聚变反应堆中,偏钛酸锂 (Li2TiO3) 作为填充卵石床形式的功能材料已被选为育种毯概念以产生和释放氚。需要很好地表征 Li2TiO3 球床的有效热导率 (keff),以便在融合相关条件下设计和分析繁殖毯。已经制造、测试并安装了基于瞬态热线技术的实验系统,用于 Li2TiO3 球床的 keff 测量。已执行有限元方法 (FEM) 模拟以优化实验装置的尺寸,目的是最大限度地减少 keff 测量中的不确定性。实验是在 1 ± 0.15 mm 直径的 Li2TiO3 球床上进行的,填充率为 63%。已经研究了温度(35-800°C)、气体环境(氦气和空气)和气压(0.105-0.4 MPa(绝对值))对 Li2TiO3 球床的 keff 的影响。发现随着氦气压力的降低,keff 降低,而随着气压的降低,keff 的降低不显着。Li2TiO3 球床的测量keff 结果已经与文献实验结果进行了比较并且非常吻合。还提出了在 0.105-0.4 MPa 的氦气和空气环境中 Li2TiO3 球床的 keff 的经验相关性,并作为温度的函数。发现随着氦气压力的降低,keff 降低,而随着空气压力的降低,keff 的降低不显着。Li2TiO3 球床的测量keff 结果已经与文献实验结果进行了比较并且非常吻合。还提出了在 0.105-0.4 MPa 的氦气和空气环境中 Li2TiO3 球床的 keff 的经验相关性,并作为温度的函数。发现随着氦气压力的降低,keff 降低,而随着空气压力的降低,keff 的降低不显着。Li2TiO3 球床的测量keff 结果已经与文献实验结果进行了比较并且非常吻合。还提出了在 0.105-0.4 MPa 的氦气和空气环境中 Li2TiO3 球床的 keff 的经验相关性,并作为温度的函数。
更新日期:2020-09-01
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