Prediction of Ultrasonic Attenuation in Liquid-Solid Particulate Two-phase System with Monte Carlo Method
Prediction of Ultrasonic Attenuation in Liquid-Solid Particulate Two-phase System with Monte Carlo Method
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发表时间：
2014
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通讯作者：
Guo Pan-pa
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作者：
Guo Pan-pa
为了研究复杂的声散射现象，采用蒙特卡罗方法建立了一种新的高浓度颗粒两相流中颗粒粒径表征模型。从单颗粒散射理论出发，对不同粒径、浓度和超声频率的玻璃珠/水两相体系中的声衰减特性进行了数值模拟。通过与单次散射理论的ECAH模型的比较，发现在浓度为1%（φ）时，两者吻合较好，但随着浓度的增加，出现明显的发散。同时，将仿真结果与文献中的实验结果进行了比较.结果表明，蒙特卡罗方法预测的两相体系中粒子半径为35和90 μm的衰减与实验结果吻合较好。所提出的蒙特卡罗方法可用于计算高浓度（50%）颗粒的衰减，以及复杂散射条件下颗粒尺寸测量的数值模拟。
For the study of complex sound scattering phenomena, the Monte Carlo method was investigated to establish a novel particle size characterization model in concentrated particulate two-phase flow. Starting from the single particle scattering theory, the numerical simulation was carried out to predict the acoustic attenuation characteristics in the two-phase system of glass bead/water with different particle sizes, concentrations and ultrasonic frequencies. Through the comparison of ECAH model of single scattering theory, it was found that they met each other well at the concentration of 1%(φ), while clear divergence occurred with the increase of the concentration. At the same time, the simulation results were compared with experiment result from literature. It was shown that the attenuation in the particle radii of 35 and 90 μm in two-phase system predicted by Monte Carlo method agreed well with experiments. The proposed Monte Carlo method could be used for calculating the attenuation in high particle volume concentration of 50% and numerical modeling of particle size measurement in the complex scattering condition.