应用分子聚集型维里方程推算工质热物理性质

1分子聚集理论简介任何物质在气态和液态时均存在分子聚集行为，分子的这种聚集行为是由分子间作用力，即范德华力（包括定向力、诱导力和色散力）与弱化学力（如氢键等）所致。任何物质体系都是由大小不同的分子聚集体所组成，物质体系的分子的聚集程度不仅与分子大小、形状结构特性有关，而且随物质体系所处的状态（温度、压力和组成等）以及外场（如电磁场、声波场等）而变化。分子聚集的一个明显结果是实际分子数（包括单体分子，双聚体分子和多聚体分子）减少，而表现分子量增加，现定义一聚集参数j：来描述分子聚集行为，其中N，NO…

ESTIMATION OF THERMOPHYSICAL PROPERTIES OF WORKING SUBSTANCES BY USING THE VIRIAL EQUATION OF MOLECULAR AGGREGATION

Based on the molecular aggregation model the virial equation for molcular aggregation was proposed, and then used to estimate the saturated vapor phase density and vaporization enthalpy data for 36 substances, including strongly polar, associated compounds. The agree-ment between calculated and experimented data was quite satisfactory. It shows that the virial equation of molecular aggregation here in is well suited to describe the thermodynamic behavotir of saturated vapors.