In order to understand fuel vaporization and fuel-air mixing phenomena, methods for determining the concentration of fuel vapor and liquid are necessary. Previously, the vapor phase concentration was normally calculated from the absorption measurement. However, the absorption coefficient of vapor is a characteristic of the solute and depends on the wavelength of the excitation light, the solvent, and the temperature. Therefore it may require that each parameter be correctly determined, and the overall accuracy depends on the accuracy of separate parameters. In this study a direct measurement of the vapor pressure and temperature was conducted and those results were compared with the results from the absorption measurement. The method used in the direct pressure measurement is much closer to an estimate based on the Clausius-Clapeyron equation. Based on this argument, it is believed that the direct pressure measurement method is preferred for accurate measurement of the vapor phase concentration to apply to the quantitative analysis in fuel spray study.
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