| 加压下纯流体表面张力的统计热力学模型 |
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| 引用本文： | 李志宝,李春喜.加压下纯流体表面张力的统计热力学模型[J].石油学报(石油加工),1997,13(3):65-70. |
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| 作者姓名： | 李志宝 李春喜 |
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| 作者单位： | 清华大学化学工程系 |
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| 摘 要： | 从Ｋｉｒｋｗｏｏｄ－Ｂｕｆｆ理论出发，引入Ｇｕｂｂｉｎｓ的Ｌｅｎｎａｒｄ－Ｊｏｎｅｓ模型流体的径向分布函数表达式，建立了一个三参数分子热力学模型，可以准确计算加压下纯流体的表面张力。对２２个纯组分流体的表面张力进行了关联，温度从常温到临界点，压力从常压到几十个大气压，计算的平均标准差为０．６０５５ｍＮ／ｍ，精度令人满意。
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| 关 键 词： | 表面张力 统计热力学模型 流体 多相流 |
A STATISTICAL THERMODYNAMIC MODEL OF SURFACE TENSION FOR PURE FLUIDS AT HIGH PRESSURE |
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| Li Zhibao,Li Chunxi,Lu Jiufang,Li Yigui.A STATISTICAL THERMODYNAMIC MODEL OF SURFACE TENSION FOR PURE FLUIDS AT HIGH PRESSURE[J].Acta Petrolei Sinica (Petroleum Processing Section),1997,13(3):65-70. |
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| Authors: | Li Zhibao Li Chunxi Lu Jiufang Li Yigui |
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| Abstract: | In this paper,a new analytical expression for the surface tension of a planar liquid vapor interface near a critical point is obtained on the basis of Kirkwood Buff equation.Two assumptions are introduced to this model:(1)treating pure real fluids as Lennard Jones model fluids, (2)the radial distribution function (RDF) relevant to vapor phase molecules and liquid phase molecules being the mean of RDF in vapor bulk and in liquid bulk. At the same time,Gubbins equation for RDF of Lennard Jones Fluid is applied.It is a statistical thermodynamic model including three parameters and can be used to calculate the surface tension of pure liquid at high pressure.By using this model,the surface tension of 22 pure fluids are correlated with the standard deviations(SD)0 6055 mN/m. The calculation results show that model proposed by this paper is accurate even in the domain of critical points,and reliable to industrial applications. |
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| Keywords: | surface tension Kirkwood buff theory Lennard Jones model high temper a ture and high pressure |
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