抄録
1. INTRODUCTION We reported an ethanol separation phenomenon into atomized mist by irradiation of ultrasound from under the surface of solution [1-2]. The separation mechanism has still been unclear. In this report, we discuss the effect of heat transfer in gas phase after atomization. 2. EXPERIMENTAL In this report, we used 15 kinds of pure materials. The other procedure of experiment was according to the previous paper [2]. The temperatures of the gas phase at the inlet and the outlet of air flow were accurately measured. 3. RESULTS AND DISCUSSION The relationship between the boiling points of the pure materials and the atomization rate are plotted in figure 1. The results can be separated in two types: that of the polarity group ○; and that of the non-polarity group ●. Atomization rate increased with decreasing boiling point. The bounding energy between molecules of the polarity group is stronger than that between molecules of the other group. As shown in figure 2, which horizontal axis indicates the products of the atomization rate of the pure materials and latent heat, whose vertical axis indicates the heat decrease of the introduced air at the inlet and outlet of the experimental atomization apparatus. This result indicates that the temperature decrease is high at a high atomization rate, If the atomized mist is completely vaporized in the gas phase, namely, the atomized liquid changed its phase to the vaporized gas, both the latent heat of atomized mist and the enthalpy decrease in the introduced air should be equal. The oscillation energy of ultrasonic atomization was 15J/s-16J/s. The enthalpy unbalance in figure 2 suggests that the vaporization of atomized liquid into the introduced air is not completely at the molecular level. The insufficiency of the enthalpy decrease of the introduced air for atomization means that all bound inter-molecules in the atomized liquid must not be cut, parts of the bound molecules may be kept as a sol of the atomized liquid. Sol formation in the gas phase is the reason for the insufficiency of the enthalpy decrease in the gas phase. Figure 1 also suggests that the sol formation in atomization is caused by the polarity group retaining more bound inter-molecules than the non-polarity group. Moreover, in the case that the aerosol radius is less than ten nano meter, Thomson-Gibb' effect will be larger. The vapor pressure of target substance on aerosol will exponentially increase.
