标准氢的热导率方程

Thermal conductivity equation for normal hydrogen

在广泛搜集标准氢（25%仲氢）热导率实验数据的基础上,运用单纯形算法拟合了标准氢的热导率计算方程。方程与实验数据的偏差一般在5.0%以内。结合工程应用实际,本文方程的适用范围为100-500 K,压力不超过150 MPa的区域。方程的不确定度为3.0%。方程具有一定的外推性,可以用于100 K以下或500 K以上的区域,但是不建议温度超过1000 K,压力超过250 MPa。方程可以满足工程实际的要求。

In the study of hydrogen economy,the thermophysical properties of normal hydrogen are required to simulate a hydrogen system,including the thermodynamic properties,such as heat capacity and vapor pressure,and transport properties,such as thermal conductivity and viscosity.The thermal conductivity has a large effect on the heat transfer characteristics,which,in turn,greatly impact the cost and economic feasibility of the hydrogen system.Hence,a new equation for thermal conductivity of normal hydrogen（25% para-hydrogen）is proposed by fitting extensive experimental data using a simplex method in this work.The deviations between the values calculated by the equation and the experimental data are generally less than 5.0%.The valid range of the equation is from 100 K to 500 K at pressures up to 150 MPa,and the uncertainty of the equation is estimated to be 3.0%.The extrapolation of the equation is reasonable,so the equation can be used at temperatures below 100 K or from 500 K to 1000 K at pressures up to 250 MPa.