Revealing the physicochemical mechanism for ultrasonic separation of alcohol-water mixtures
Revealing the physicochemical mechanism for ultrasonic separation of alcohol-water mixtures
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DOI：
10.1063/1.1495849
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发表时间：
2002-08-22
影响因子：
4.4
通讯作者：
Toll, F
中科院分区：
文献类型：
--
作者：
Kirpalani, DM;Toll, F
最近Sato、Matsuura和Fujii报道了通过超声雾化从乙醇-水混合物中选择性分离乙醇[J. Chem. Phys. 114，2382（2001）]。在这项工作中，实验数据证实了富乙醇液滴雾的产生，并试图解释选择性分离的参数衰减不稳定性的毛细管波在超声处理过程中形成的。在目前的工作中，一个替代机制的基础上的协同理论已被假定为超声雾化过程。该机制涉及在超声处理期间在液体中形成空化气泡，并且它们最终在液体表面处塌陷成微泡云，微泡云在毛细管喷泉射流中向上移动。醇的选择性分离已被解释为导致在微泡的表面处形成的醇分子的表面过量的物理机制的必然结果。酒精分子蒸发到微泡中，并在声能高度积累的区域中在其崩溃时释放富含酒精的雾。
The selective separation of ethanol from ethanol-water mixtures by ultrasonic atomization has been reported recently by Sato, Matsuura, and Fujii [J. Chem. Phys. 114, 2382 (2001)]. In that work, experimental data were reported that confirmed the generation of an ethanol-rich droplet mist and attempted to explain the selective separation in terms of parametric decay instability of the capillary wave formed during sonication. In the present work, an alternate mechanism based on the conjunction theory has been postulated for the process of ultrasonic atomization. This mechanism involves the formation of cavitating bubbles in the liquid during sonication and their eventual collapse at the liquid surface into a cloud of microbubbles that moves upwards in a capillary fountain jet. The selective separation of alcohols has been explained as a corollary effect of the physical mechanism resulting in a surface excess of alcohol molecules formed at the surface of the microbubbles. The alcohol molecules vaporize into the microbubbles and release an alcohol-rich mist on their collapse in regions of high accumulation of acoustic energy.