有限元模拟土壤孔隙对双针热脉冲法测量比热的影响
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国家自然科学基金项目(41371231)资助


Finite element analysis of effect of soil pores on measurement of specific heat with the dual-probe heat-pulse method
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    摘要:

    双针热脉冲(DPHP)方法是目前用来测量土壤比热(c)、热导率(λ)和温度( T )的重要方法。然而,很多因素均会导致双针热脉冲法测得的λc存在误差,如土壤孔隙。基于三种不同粒径的石英砂,通过有限元法(FEM)模拟DPHP实验,分析土壤孔隙对DPHP法测量比热的影响,结果表明:(1)土壤孔隙导致测得的温度空间分布存在显著的各向异性,加热针周围6 mm处不同方向的比热(c)之间相对误差达到了23%;(2)DPHP方法测得的土壤热特性标准差随粒径增大而增大,这与实际实验观察的结果一致;(3)土壤孔隙的存在使得DPHP法测得的土壤比热被高估,本模拟中加热针周围6 mm处c值被高估了约6%。

    Abstract:

    The Dual Probe Heat Pulse (DPHP) method is an important method to measure specific heat (c), thermal conductivity (λ) and temperature ( T ) of soil. However, there are a number of factors that may cause errors in measurement of bothλλ and c using DPHP, such as soil pores. With finite element method (FEM) simulating DPHP experiments ,three kinds of quartz sands which different in particle size were used to analyze the effect of soil pores on measurement of specific heat with the DPHP method, and the result shows that (1) soil pores caused significant anisotropy of spatial distribution of measured temperatures and led to a relative difference, reaching as high as 23% in c measured between different spots 6mm away from the heater in different directions; (2) the standard deviation of the measurement of the soil thermal properties with DPHP increased with the increasing particle size, which was consistent with the observation during the experiments; and (3) the existence of soil pores led to overestimation of c when the DPHP method was used. In this simulation, the specific heat measured at 6 mm away from the heater was overestimated by about 6%.

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肖 潇,刘 刚,李保国.有限元模拟土壤孔隙对双针热脉冲法测量比热的影响[J].土壤学报,2013,50(6):1138-1142. DOI:10.11766/trxb201302220081 Xiao Xiao, Liu Gang, Li Baoguo. Finite element analysis of effect of soil pores on measurement of specific heat with the dual-probe heat-pulse method[J]. Acta Pedologica Sinica,2013,50(6):1138-1142.

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  • 收稿日期:2013-02-22
  • 最后修改日期:2013-08-22
  • 录用日期:2013-08-30
  • 在线发布日期: 2013-08-30
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