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为研究高浓度颗粒两相流中超声复散射现象并建立颗粒表征模型,从单颗粒弹性散射理论出发,采用蒙特卡罗方法预测不同粒度、浓度及超声频率下玻璃微珠/水颗粒两相体系中颗粒的超声衰减特性.在颗粒体积浓度低于1%时,蒙特卡罗方法与基于单散射理论的ECAH模型吻合较好,随颗粒体积浓度和颗粒尺寸增加,声的衰减呈非线性变化,二者差异增加.利用该方法预测颗粒半径为35和90μm的液固两相体系随浓度衰减变化的结果与文献实验值基本一致.蒙特卡罗方法可用于50%固相体积浓度范围内超声衰减计算并为超声法颗粒测量提供理论模型基础.
In order to study the phenomenon of ultrasonic double scattering in high concentration particles and to establish a particle characterization model, Monte Carlo method was used to predict the particle size, concentration and ultrasonic frequency of glass bead / water particle two-phase system The Monte-Carlo method is in good agreement with the ECAH model based on single-scattering theory when the volume concentration of particles is less than 1%. With the increase of particle volume concentration and particle size, the attenuation of sound is nonlinear, The difference between the two methods is increased.The results of the method using this method to predict the change of the liquid-solid two-phase system with the particle radius of 35 and 90 μm with the concentration decay are in good agreement with the experimental values in the literature.The Monte Carlo method can be used for the ultrasonic attenuation in the volume concentration range of 50% Calculating and providing theoretical model basis for ultrasonic particle measurement.