Enthalpy phase change predictions from van der Waals equation

Jeffery Lewins

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Enthalpy phase change predictions from van der Waals equation

机译：范德华方程的焓相变预测

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摘要

It is pointed out that a P,v, T relation, or equation of state, predicting a phase change has calorimetric data embedded in it, such as the latent heat or enthalpy change at the phase transition. This is illustrated by solving van der Waals equation over a range of subcritical temperatures, employing Maxwell's construction for the saturation pressure and deriving the data from Clausius-Clapeyron. The results allow a comparison with real data. For example, water substance data are shown to be only modestly represented by a van der Waals model. Nevertheless, the procedure is applicable to more elaborate P,v,T relations for real substances.

机译：要指出的是，预测相变的P，v，T关系或状态方程中嵌入了量热数据，例如相变时的潜热或焓变。通过在亚临界温度范围内求解范德华方程式，使用麦克斯韦构造的饱和压力并从克劳修斯-克拉皮龙得出数据来说明这一点。结果允许与真实数据进行比较。例如，显示的水物质数据仅由范德华斯模型适度代表。但是，该程序适用于更详尽的真实物质的P，v，T关系。

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来源
《International Journal of Mechanical Engineering Education》 |2006年第1期|p.71-84|共14页
作者
Jeffery Lewins;
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作者单位

University of Cambridge;

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原文格式 PDF
正文语种 eng
中图分类机械、仪表工业;
关键词
van der waals; spinodal; saturation pressure; MATLAB; calorific phase data;

机译：范德华;尖峰;饱和压力;MATLAB;热相数据;

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Enthalpy phase change predictions from van der Waals equation

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