超声场中悬浮粒子对空化微流的影响

发布时间：2018-08-10 08:00

【摘要】：对悬浮粒子和空化泡间的相互作用进行了理论分析,得到了气泡内外n=0模式(脉动)和n=1模式(平动)相关的微流分布.利用Matlab软件对微流分布绘图,数值分析结果表明:由于悬浮粒子的影响,空化泡内部和外部的声流速度显著增大,尤其是气泡周围声流速度的切线分量,气泡内部的声流速度明显强于气泡外部的声流速度.当θ从0到π时,气泡n=0模式微流切向速度在θ2=π/2处达到最大值,其方向垂直于声波的传播方向,而n=1模式微流切向速度大小在θ2=π/2时趋于0.气泡周围声流速度的大小和方向与处在介质中的相对位置密切相关.根据气泡声流速度矢量分布图,发现n=0的模式对声流速度起主要作用,而n=1的模式将声流速度限定在气泡表面附近的区域.
[Abstract]:The interaction between suspended particles and cavitation bubbles is theoretically analyzed, and the distributions of microflow related to the nwe 0 model (pulsation) and the ni 1 model (translation) are obtained. The Matlab software is used to plot the microflow distribution. The numerical results show that the acoustic velocity inside and outside the cavitation bubble increases significantly due to the influence of suspended particles, especially the tangent component of the sound flow velocity around the bubble. The sound flow velocity inside the bubble is obviously stronger than that outside the bubble. When 胃 is from 0 to 蟺, the tangential velocity of the bubble nn0 mode reaches the maximum value at 胃 2 = 蟺 / 2, and its direction is perpendicular to the direction of sound wave propagation, while the magnitude of the tangential velocity of the nun1 mode microflow tends to 0 at 胃 2 = 蟺 / 2. The magnitude and direction of the sound flow velocity around the bubble are closely related to the relative position in the medium. According to the velocity vector distribution of bubble sound flow, it is found that the mode of N0 plays a major role in the velocity of acoustic flow, while the mode of N0 1 limits the velocity of sound flow to the region near the surface of the bubble.
【作者单位】：陕西师范大学超声学重点实验室;
【基金】：国家自然科学基金(11204168;11474191) 中央高校基本科研业务费专项资金(Gk201603102)
【分类号】：O426

【相似文献】