A Spherical Steady-State Method to Measure Soil Thermal Conductivity
A Spherical Steady-State Method to Measure Soil Thermal Conductivity
复制标题
测量土壤热导率的球形稳态方法
DOI：
10.1134/s1064229319120093
复制
发表时间：
2019
影响因子：
1.4
通讯作者：
Fujimaki H.
中科院分区：
文献类型：
--
作者：
Mahdavi S. M.;Neyshabouri M. R.;Fujimaki H.
摘要可靠地预测三相土壤的热湿耦合迁移需要准确地估算土壤的导热系数。在目前的工作中，稳态的方法来测量土壤导热系数。将两种土壤的土壤样品包装在内径为6.6 cm、厚度为3 mm的塑料中。作为连接到5V电源的热发生器的130欧姆电阻器位于球的中心。三个热电偶分别安装在距离中心0.5、1.5和2.5 cm处。在打开球后，使用单探针方法测量热导率。在风干土壤中，两种方法测得的导热系数值几乎相同;总体而言，两种方法之间的差异小于3%。然而，在中间水分含量范围内，通过稳态方法测得的值略低于通过单探针方法获得的值。在单探针法中考虑了土壤空气热膨胀引起的对流水汽通量的影响，用新的稳态法测得的数值可能更可靠。
AbstractThe reliable prediction of coupled heat and moisture transfer in three-phase soils involves authentic estimation of soil thermal conductivity. In the current work, a steady-state method was developed to measure soil thermal conductivity. Soil samples for two soils were packed in a plastic of 6.6 cm inner diameter and 3 mm thickness. A 130 Ohm resistor as a heat generator being connected to 5 V electricity source was located in the center of the ball. Three thermocouples were installed at the distances of 0.5, 1.5, and 2.5 cm from the center, respectively. After unpacking the ball, thermal conductivity was measured using the single probe method. The thermal conductivity values measured by both methods were almost the same in air dry soils; overall, the observed differences between the two methods were less than 3%. However, in the intermediate moisture content ranges, the values measured by the steady-state method were slightly lower than those obtained by the single probe method. Considering the effect of convective vapor flux due to thermal expansion of soil air in the single probe method, values measured with the new steady-state method may be more reliable.
存在渗透梯度的情况下土壤柱中的水蒸气传输
影响因子：
6.1
作者：
S. M. Mahdavi;M. Neyshabouri;H. Fujimaki
通讯作者：
H. Fujimaki