低温高密度N_2气体的状态方程

EQUATION OF STATE FOR GAS N_2 AT LOW TEMPERATURE AND HIGH DENSITY

将BeattieBridgeman(BB)方程和其改进形式BenedictWebbRubin(BWR)方程应用于低温高密度的N2气体,通过计算值与实验值的比较发现:在N2气体温度低至150K、压强达100MPa和密度达临界密度ρc的2.548倍时,BWR方程仍能计算出可靠的结果,对低于临界温度的过冷气体也能给出较高准确度的计算结果,这说明该方程对低温高密度的N2气体能准确描述。而BB方程却不适用于低温高密度的情况。

The present paper has calculated the p V T of gas N 2 at temperature 150K and density not more than 2 548 ρ c using Beattie Bridgeman(BB) equation of state and its modification Benedict Webb Rubin(BWR).It is surprisingly found that the BWR equation of state is accurate at such low temperature and rather high density.For example,the error is not more than 4 50% until 100 00MPa of pressure,however,BB equation of state is absolutely invalid at the same condition.Therefore,BWR equation of state can represent the behavior of gas N 2 at or near the critical state as well as high density state.