论文部分内容阅读
气泡内的气体成分对声致发光阈值有很大影响. 通过对不同气体成分气泡的声致发光阈值的研究, 揭示了声致发光的机制. 实验结果表明, 随着惰性气体原子质量的依次降低, 声致发光的阈值声压逐渐增加, 结合实验所得的不同惰性气体对应的阈值声压, 对气泡内产生的温度进行数值模拟, 发现不同惰性气体的气泡对应的阈值温度相等, 而当声致发光很强情况下, 气泡的发光满足轫致辐射机制. 由实验和数值模拟的结果可以推测, 在超声空化过程中, 气泡内的水分子首先裂解并放出光子, 随着温度的升高, 惰性气体被电离, 产生轫致辐射. 气泡的发光是一个由分子辐射向轫致辐射的变化过程.
The gas composition in the bubble has a great influence on the threshold value of sonoluminescence.The mechanism of sonoluminescence is revealed by studying the sonoluminescence threshold of different gas components.The experimental results show that as the atomic mass of inert gas decreases , And the threshold pressure of sonoluminescence increased gradually. The threshold temperatures of the different inert gases were numerically simulated. The results showed that the threshold temperatures of different inert gases were equal, In the case of strong light emission, the luminescence of the bubble satisfies the mechanism of Bremsstrahlung radiation.From the experimental and numerical simulation results, we can infer that in the ultrasonic cavitation, the water molecules in the bubble first pyrolyze and emit photons, with the increase of temperature, Inert gases are ionized to produce bremsstrahlung, which is a process of molecular radiation to bremsstrahlung.