氮气热力学性质的RK方程研究

The studies of nitrogen thermodynamic properties with RK equation

以实验测得的随温度变化的氮气维里系数为基础,采用热力学方法,根据RK方程研究了氮气的热力学性质,并讨论了90K^600K温度范围内的热力学态函数内能、焓和摩尔热容量之差.结果表明,氮气的热力学状态应采用实际气体的状态方程,例如RK方程描述更加合理,并且RK系数不是常数,要随着温度发生改变,态函数内能、焓和摩尔热容量之差的结果不同于理想气体的情况,也不同于常系数RK方程产生的结果 .

Based on experimental nitrogen virial coefficients changing with temperature andthe thermodynamics method, the thermodynamic properties of nitrogen are studied according to RK equation, and thermodynamic state function the internal energy, enthalpy and the difference of molar heat capacity are discussed in the temperature range 90 K to 600 K. The results showed that it is more reasonable that thermodynamic state of nitrogen should be applied with the real gas state equation, for example RK equation. RK coefficients are not constant, which will change with the temperature, the results of state functions internal energy, enthalpy and the difference of molar heat capacities are not only different from that of the ideal gas but also the result of the RK equation with constant RK coefficients.