CPA方程结合RG理论计算甲醇、水、氨的性质  

Thermodynamic properties of methanol,water and ammonia predicted using CPA EOS+renormalization group theory

作　　者：许心皓[1] 段远源[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2011年第5期677-680,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2009CB219805)

摘　　要：醇类、水、氨等流体在工业上有着广泛的应用,但由于氢键作用形成分子缔合,使用简单状态方程难以精确描述其热力学性质;而在近临界区,由于浓度涨落的长程关联,使其描述则更为困难。该文在CPA(cubic plus association)状态方程的基础上,用重整化群理论修正Helmholtz自由能来考虑涨落的影响,计算了甲醇、水和氨在近临界和远离临界点区域的p-ρ-T性质。结果表明:该方法显著改善了临界参数和近临界区的气液相平衡数据的描述情况,在单相区的预测精度也较高,适用于缔合流体热力学性质的研究。Alcohols,water and ammonia have many applications in industry.However,the hydrogen-bonding（association） interactions make descriptions of their thermodynamic properties by classical equations of state difficult,especially near the critical point where the true thermodynamic behavior is a consequence of long-range density fluctuations.The cubic plus association（CPA） equation of state with the Helmholtz energy modification given by renormalization group theory which accounts for the density fluctuations was used to predict the thermodynamic properties of methanol,water and ammonia near to and far from the critical point.The results show significant improvement in the representation of the critical properties and the phase equilibrium in the near critical point region.Good results were also obtained in the single-phase region.Thus,this method can describe the thermodynamic properties of various associating fluids.

关 键 词：CPA(cubic PLUS association)状态方程 重整化群理论 缔合流体 

分 类 号：TK121[动力工程及工程热物理—工程热物理] TK123[动力工程及工程热物理—热能工程]