Statistical rate theory examination of ethanol evaporation
- Paper number
IAC-10.A2.4.2
- Author
Mr. Aaron Persad, University of Toronto, Canada
- Coauthor
Prof. Charles Ward, University of Toronto, Canada
- Year
2010
- Abstract
A series of low-temperature (246 K $< T_I^L <$ 267 K) steady-state ethanol evaporation experiments have been conducted to determine the saturation-vapor pressure of metastable ethanol. The measured interfacial conditions have been used with statistical rate theory (SRT) to develop an expression for the saturation-vapor pressure as a function of temperature, $f_{srt}^{eth}$. This expression is shown to be thermodynamically consistent because it gives predictions of both the evaporative-latent heat and the liquid-constant-pressure-specific heat that are in agreement with independent measurements of these properties. In each experiment, the interfacial-vapor temperature was measured to be greater than the interfacial-liquid temperature: $\equiv \Delta T_I^{LV}$. When $f_{srt}^{eth}$ is used in SRT to predict $\Delta T_I^{LV}$, the results are shown to be consistent with the measurements. Other expressions for the saturation-vapor pressure that are in the literature are examined and found to be thermodynamically inconsistent, and do not lead to valid predictions of $\Delta T_I^{LV}$.- Abstract document
- Manuscript document
IAC-10.A2.4.2.pdf (🔒 authorized access only).
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