混合弹性颗粒体系声衰减数值模拟
发布时间：2018-07-24 20:32
【摘要】：采用概率统计方法——蒙特卡罗方法,建立一种预测液固两相体系中混合弹性球形颗粒声衰减的理论模型。在单颗粒声散射和吸收的基础上,将连续超声波抽象离散化为大量独立的声子,追踪声散射过程,通过统计接收器探测声子数最终确定声衰减系数。采用数值方法对单一球形颗粒的液固两相体系中声衰减进行预测和比较,确定了该方法的可行性后将该方法推广到混合颗粒体系中,对玻璃微珠/铁粉构成的混合颗粒及多分散混合颗粒体系进行数值研究。结果表明:在体积浓度低于10%时,蒙特卡罗法预测得玻璃微珠或铁粉颗粒声衰减和ECAH,Lloyd和Berry,Waterman等建立的模型结果吻合。对于混合颗粒构成的两相体系,算例中,随着体积浓度增大到10%,声衰减系数随混合颗粒数目比的变化呈现出了非线性的变化,同时颗粒物性也会影响不同组分颗粒对声衰减的贡献,算例中铁粉颗粒比玻璃微珠对声衰减的影响更大。
[Abstract]:A theoretical model for predicting acoustic attenuation of mixed elastic spherical particles in liquid-solid two-phase systems is established by using the probabilistic statistical method-Monte Carlo method. On the basis of single particle acoustic scattering and absorption, the continuous ultrasonic wave abstraction is discretized into a large number of independent phonons, the sound scattering process is tracked, and the acoustic attenuation coefficient is finally determined by the number of phonons detected by the statistical receiver. The acoustic attenuation in a liquid-solid two-phase system with a single spherical particle is predicted and compared by numerical method. The feasibility of the method is determined and the method is extended to the mixed particle system. The mixed particles and polydisperse mixed particles of glass bead / iron powder were studied numerically. The results show that the sound attenuation of glass beads or iron particles predicted by Monte Carlo method when the volume concentration is below 10 is in agreement with the model established by ECAH Lloyd and Berryn Waterman. For the two-phase system composed of mixed particles, as the volume concentration increases to 10, the acoustic attenuation coefficient shows a nonlinear change with the ratio of mixed particles. At the same time, the particle properties also affect the contribution of different component particles to the sound attenuation. The effect of iron powder particles on acoustic attenuation is greater than that of glass beads.
【作者单位】： 上海理工大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51176128,51206113)资助
【分类号】：O42
本文编号：2142574
[Abstract]:A theoretical model for predicting acoustic attenuation of mixed elastic spherical particles in liquid-solid two-phase systems is established by using the probabilistic statistical method-Monte Carlo method. On the basis of single particle acoustic scattering and absorption, the continuous ultrasonic wave abstraction is discretized into a large number of independent phonons, the sound scattering process is tracked, and the acoustic attenuation coefficient is finally determined by the number of phonons detected by the statistical receiver. The acoustic attenuation in a liquid-solid two-phase system with a single spherical particle is predicted and compared by numerical method. The feasibility of the method is determined and the method is extended to the mixed particle system. The mixed particles and polydisperse mixed particles of glass bead / iron powder were studied numerically. The results show that the sound attenuation of glass beads or iron particles predicted by Monte Carlo method when the volume concentration is below 10 is in agreement with the model established by ECAH Lloyd and Berryn Waterman. For the two-phase system composed of mixed particles, as the volume concentration increases to 10, the acoustic attenuation coefficient shows a nonlinear change with the ratio of mixed particles. At the same time, the particle properties also affect the contribution of different component particles to the sound attenuation. The effect of iron powder particles on acoustic attenuation is greater than that of glass beads.
【作者单位】： 上海理工大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51176128,51206113)资助
【分类号】：O42
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