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Experimental Evaluation of the Thermal Conductivity of Silica Sands with Varying Porosity and Particle Size

机译：孔隙度和粒径变化的硅砂导热系数的实验评估

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摘要

The physical properties of granular materials, such as hydraulic, strength, and thermal properties, are dependent on the density (or porosity) and particle size distribution of materials. Among others, the understanding in thermal properties of granular materials is still in immature stage. In this study, the thermal conductivity, one of important thermal properties, of Silica sands with varying porosity and particle size are experimentally investigated using the transient method. Based on experimental results, the thermal conductivity of granular materials was presented as the function of porosity and proportion of finer particles. It was found that the thermal conductivity tends to become lower under higher porosity and lower proportion of finer particles, and vice versa. Further study on the thermal conductivity of granular materials regarding their packing condition and particle size distributions should be required more in mechanical or generalized terms.
机译：粒状材料的物理特性（例如水硬性，强度和热特性）取决于材料的密度（或孔隙率）和粒度分布。除其他外，对粒状材料的热性能的了解还处于不成熟阶段。在这项研究中，使用瞬态方法实验研究了具有不同孔隙率和粒径的硅砂的热导率（一种重要的热性能）。根据实验结果，将颗粒材料的导热系数表示为孔隙率和细颗粒比例的函数。已经发现，在较高的孔隙率和较低的较细颗粒的比例下，热导率趋于降低，反之亦然。应当从机械或广义的角度对颗粒材料的热导率有关其填充条件和粒度分布的进一步研究进行研究。

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