【摘要】 通过实时观察和拍摄表明,鲁米诺-碱性水溶液的声致荧光具有某些宏观特征。即声致荧光的空间分布随容器形状而变,在对称性容器中是准对称分布的;在不对称容器中除不对称分布外,还表现出明显的束流形态;声反射界面对这种光像及其亮度分布有显著影响。这种影响有:反射凸面使光像呈散射状;反射凹面使光像呈会聚状;在这两种反射面附近的声致荧光均得以增强。这说明,产生声致荧光的超声空化场既保留了超声声场的反射、散射和会聚等传播共性,也有其固有的空间特征。其中,声致荧光的束流形态可能源于超声辐射力对空化泡群的驱动作用,而它的界面增强效应或许是声反射界面作为新一处的空化核滋生源而引发了更多的空化事件的缘故。更多还原

【Abstract】 Some macro and real-time characteristics revealed from the sonofluorecence image of aqueous luminol-alkaline solution indicates that space distribution of sonofluorecence varies with the shape of the solution container. When symmetric container is used, sonofluorecence shows quasi-symmetric distribution. When unsymmetric container is used, the distribution is not only unsymmetric but also in a clear state of streaming. It is also observed that the acoustic interface in the solution has significant influence on the distribution and intensity of the sonofluorecence - convex interface makes it scatter while concave interface makes it converge. However, in both cases the sonofluorecence appears to have intensified at the close vicinity of the reflecting interface. This phenomenon shows that ultrasonic cavitation field has dual ″personalities″. One is inherited from the normal ultrasound field, which shows the regular features of reflection, absorption, scatter and convergence; the other is a possible result from newly generated cavitation nuclei at the interfaces and the radiating force on the cavitation nuclei, which manifests itself as the streaming and intensifying effect.更多还原