【摘要】 探讨势函数对伪势格子Boltzmann模型基于PR状态方程计算饱和水气液两相密度的影响,发现选取合适的势函数形式虽可使模拟结果与Maxwell理论解吻合良好,但其与实验值的差距却较大,需修正PR方程。基于伪势模型分析文献中的PR型状态方程发现,单独修正引力或斥力项,均无法同时兼顾计算精度和模型适用的温度范围。为此,本文基于该模型同时对PR方程的引、斥力项系数进行修正,得到了一个新的能够准确地描述饱和水气液两相性质的状态方程。更多还原

【Abstract】 Exploring the effects of potential function on the saturated liquid and vapor densities of water calculated by pseudo-potential Lattice Boltzmann model(PLBM)based on PR equation of state(EOS).Choosing proper potential function form,the simulation results agree well with the Maxwell theoretical values,but there are noticeable differences existing between the simulation results and experimental data.The parameters in PR EOS need modifications.Analyzing the PR-type EOSs available in literatures,we find from simulations by PLBM that only modifications to the attractive or repulsive parameter in the PR EOS cannot increase the calculation precision of both liquid and vapor density,and at the same time enlarge the applicable temperature range of the PLBM.Therefore,we establish a more accurate PR-type EOS for saturated water and vapor by modifying both the attractive and repulsive parameters in the PR EOS based on PLBM simulations.更多还原