| 用扩展的Enskog理论预测正构烷烃的导热率 |
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| 引用本文： | 于养信,高光华.用扩展的Enskog理论预测正构烷烃的导热率[J].工程热物理学报,1997(5). |
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| 作者姓名： | 于养信 高光华 |
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| 作者单位： | 清华大学化学工程系!北京100084 |
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| 摘 要： | 1引言在现代工业特别是化学工业和石油工业中，广泛涉及到物质传热过程。因此，作为表征物质热传导强弱的导热率是科研与生产必不可少的重要物性数据之一。作为物质导热率研究的一个方面，液体导热率的研究一直受到人们的关注。现在已有许多液体导热率关联方程发表，但这些方程往往适用范围较窄，是纯经验或半经验的，其理论性不强。只有Enskog公式＊中各参数的物理意义明确，所以此公式的实际应用有待进一步研究。本文用热压代替znsx。g公式中的体系压力，其中热压用un状态方程回来计算，找出正构烷烃分子硬球直径的变化规律，对正构烷烃…
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| 关 键 词： | Enskog理论 预测 正构烷烃 导热率 |
PREDICTION OF THERMAL CONDUCTIVITIES OF LIQUID N-ALKANES BY THE MODIFIED ENSKOG THEORY |
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| YU Yangxin GAO Guanghua.PREDICTION OF THERMAL CONDUCTIVITIES OF LIQUID N-ALKANES BY THE MODIFIED ENSKOG THEORY[J].Journal of Engineering Thermophysics,1997(5). |
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| Authors: | YU Yangxin GAO Guanghua |
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| Abstract: | The Enskog theory of the thermal conductivities of liquids is improved by replacing the pressure of the system by the thermal pressure. The dependence of the molecular hard sphere diameter on the number of carbon atoms in each nalkane molecule is introduced. The thermal pressures and molar volumes of liquid n-alkanes are calculated by using PengRobinson equation of state. The modified Enskog theory has been used to predict the thermal conductivities of 12 liquid n-alkanes. The total average relative standard deviation of the thermal conductivities between the predicted and the experimeatal data is 5.2%. This precision is acceptable. |
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| Keywords: | Enskog theory prediction n-alkane thermal conductivity |
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