P-13 超音波霧化を用いた水溶液の濃縮挙動に及ぼす液物性の影響
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The effect of liquid property on the concentration by ultrasonic atomization is examined. The concentration by ultrasonic atomization is simply modeled and the surface excess content under ultrasound irradiation is estimated. A cylindrical and transparent vessel (100 mm in diameter and 500 mm in height) was used. The carrier gas was air and flowed thorough the vessel to accompany droplets atomized. The samples to be atomized were Methanol, Ethanol and n - Propanol aqueous solutions. The initial content in liquid was changed. After the ultrasound irradiation, the liquid volume and the content in residual liquid were measured. For accompanied liquid, the flow rate and content were calculated from the material balance. The flow rate of accompanied liquid becomes lower as the liquid viscosity becomes higher. This is because the attenuation of ultrasonic energy increases with increasing liquid viscosity. The content in accompanied liquid is higher than that in liquid. At the same content in liquid, the content in accompanied liquid increases with increasing length of hydrophobic group. In the model of mechanism of concentration by ultrasonic atomization, it is assumed that the droplet has the alcohol film around its surface and that the content in film corresponds to the surface excess content (alcohol mole per surface area). The surface excess content is estimated from the content in accompanied liquid, content in liquid and droplet size. As the content in liquid becomes higher, the surface excess content increases. At the same content in liquid, the surface excess content is scarcely affected by the alcohol kind.
- 日本ソノケミストリー学会の論文
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