论文标题
测量LANI的有效导热率$ _5 $粉末包装床
Measurement of effective thermal conductivity of LaNi$_5$ powder packed bed
论文作者
论文摘要
LANI的有效导热率$ _5 $粉末包装床已使用定制的护卫板（GHP）设备进行了分析。在这里，GHP的设计用于精确测量金属水合粉的有效热导率，即使样品量很小（2.12 $ \ times $ 10 $^4 $ mm $ $^3 $）。样品容器和设备的尺寸通过二维（2-D）稳态热传导分析确定。进行了校准实验和不确定性分析，以验证GHP的准确性。估计，根据LANI $ _5 $填充床的残留热导率的测量，估计粒度对LANI $ _5 $填充床的接触系数的影响。通过将Yagi和Kunii（YK）模型应用于LANI $ _5 $填充床的有效导热率，接触因子的影响以及气体导热率对气体膜特征长度的影响。 YK模型的因素在当前工作中进行了修改，并通过与先前文献的实验数据进行了比较来验证。
Effective thermal conductivity of LaNi$_5$ powder packed bed was analyzed with customized guarded hot-plate (GHP) apparatus. Here, GHP was designed for precise measurement of effective thermal conductivity of metal-hydride powders even with small sample amounts (2.12$\times$10$^4$ mm$^3$). Dimensions of sample container and apparatus were determined through two-dimensional (2-D) steady-state heat conduction analysis. Calibration experiment and uncertainty analysis were conducted to validate the accuracy of the GHP. Based on the measurements of the residual thermal conductivity of the LaNi$_5$ packed bed, effect of particle size on contact factor of LaNi$_5$ packed bed was estimated. By applying the Yagi and Kunii (YK) model to the effective thermal conductivity of LaNi$_5$ packed bed, effect of contact factor and gas thermal conductivity on characteristic length of gas film were newly analyzed. Factors of YK model were modified in present work and validated through comparison with experimental data from previous literature.
