声场与磁场作用下磁流体中气泡的动力学特性

Dynamic behavior of a bubble in magnetic liquid by acoustic field and magnetic field

以磁性液体为工作介质,利用无量纲化气泡的RP控制方程,模拟分析了无量纲化的磁场强度和无量纲化的声波频率、声压幅值的变化对气泡运动特性的影响。结果表明:磁场的存在影响声波作用下气泡的运动特性,低磁场强度有利于提高声空化处理效果;并且在气泡压缩阶段施加磁场时,磁场越强越有利于空化发生,本文结果对于提高和改进空化降解有机污染物的技术具有指导意义。

The dynamics of a bubble under acoustic field and a magnetic field is researched by regarding magnetic liquid as a working medium.The effects of the dimensionless frequency and strength of acoustic field and the dimensionless strength of magnetic field on bubble dynamical behaviors by Rayleigh-Plesset equation are numerically simulated.The results show that the existence of the magnetic field affects the movement characteristics of a bubble under acoustic wave,and low magnetic field intensity is helpful to improve the effect of acoustic cavitation process.But if the bubble collapse stage applied magnetic field,results show that the stronger the magnetic field,the more conducive to cavitation occurs.This is of important theoretical significance not only for further research bubble movement characteristic by acoustic and magnetic field interaction but also enhancing and improving the cavitation degration of organic pollutant technology.