Ecotopia Science Institute, Nagoya University, Chikusa-ku, Aichi, Japan.
Ultrason Sonochem. 2010 Aug;17(6):978-84. doi: 10.1016/j.ultsonch.2009.11.020. Epub 2009 Dec 5.
Visualization of cavitation behavior in a rectangular sonochemical reactor at 490 kHz was carried out by a laser sheet technique and the distribution of liquid flow was measured by a laser Doppler velocimeter. The pattern of liquid flow and distribution of acoustic pressure of the rectangular sonochemical reactor were investigated as a function of the input power from 10 to 50 W. The liquid moved upward above the transducer at every power. As increasing the input power, the random flow out side the cylindrical part above the transducer changed into the convective one and the region of the visualized standing wave which was formed in the cylindrical part changed with the input power. The position showing the sonochemical luminescence exists inside or near the region where the standing wave was visualized. Introduction of a stirrer resulted in disturbance of liquid flow and expanded the position showing the sonochemical luminescence, but the luminescence intensity was weakened. The sonochemical efficiency was enhanced by about twice by introduction of the stirrer. From these results, we discussed the effects of liquid flow on sonochemical efficiency with and without a stirrer.
在 490 kHz 下，通过激光片技术对矩形声化学反应器中的空化行为进行了可视化，并用激光多普勒速度计测量了液体流动的分布。研究了作为输入功率从 10 到 50 W 的函数的矩形声化学反应器的液体流动模式和声压分布。在每种功率下，液体都在上部换能器上方向上移动。随着输入功率的增加， transducer 上方圆柱形部分外部的随机流动变为对流，并且在圆柱形部分中形成的可视化驻波的区域随输入功率而变化。显示声化学发光的位置存在于驻波可视化区域内或附近。引入搅拌器会干扰液体流动并扩大显示声化学发光的位置，但发光强度会减弱。引入搅拌器可将声化学效率提高约两倍。从这些结果中，我们讨论了有无搅拌器时液体流动对声化学效率的影响。
