International Journal of Thermophysics ( IF 2.2 ) Pub Date : 2021-05-03 , DOI: 10.1007/s10765-021-02846-5 Ulf Hammerschmidt , Muhammad Abid
The thermal diffusivity of gas-saturated glass sieves (frits) of porosities between 20 % and 48 % is presented as measured at room temperature and ambient pressure. The saturants cover a range in thermal diffusivity from 20.63 × 10–6 m2⋅s−1 to 172 × 10–6 m2⋅s−1. The experiments were carried out using a transient hot-bridge instrument of an expanded uncertainty of 5 % to 10 %. It turned out that all measured thermal diffusivities of the gas-saturated frits (1) are smaller than that of the borosilicate glass the frits are made from and (2) are completely different from the thermal diffusivities of the liquid-saturated frits. Both these discrepancies can be attributed to characteristic properties of the matrix and not directly to the saturants. The first divergence results from thermal tortuosity that lengthens the pathway of heat through the matrix, whereas the second arises from dissolved He that enhances the transport of heat through the matrix.
中文翻译:
玻璃筛的热扩散率:II。气体饱和的油条
在室温和环境压力下测得的孔隙率在20%到48%之间的气体饱和玻璃筛(玻璃料)的热扩散系数。饱和剂的热扩散率范围为20.63×10 –6 m 2 s -1至172×10 –6 m 2 s -1。实验使用瞬态热桥仪器进行,不确定度在5%到10%之间。事实证明,气体饱和的玻璃料的所有测量的热扩散率(1)小于由该玻璃料制成的硼硅酸盐玻璃的热扩散率,并且(2)与液体饱和的玻璃料的热扩散率完全不同。这两种差异都可以归因于基质的特性,而不能直接归因于饱和剂。第一个发散是由于热曲折延长了热通过基质的路径,而第二个发散是由于溶解的He引起了,He增强了热通过基质的传递。