【摘要】：采用概率統(tǒng)計(jì)方法——蒙特卡羅方法,建立一種預(yù)測液固兩相體系中混合彈性球形顆粒聲衰減的理論模型。在單顆粒聲散射和吸收的基礎(chǔ)上,將連續(xù)超聲波抽象離散化為大量獨(dú)立的聲子,追蹤聲散射過程,通過統(tǒng)計(jì)接收器探測聲子數(shù)最終確定聲衰減系數(shù)。采用數(shù)值方法對單一球形顆粒的液固兩相體系中聲衰減進(jìn)行預(yù)測和比較,確定了該方法的可行性后將該方法推廣到混合顆粒體系中,對玻璃微珠/鐵粉構(gòu)成的混合顆粒及多分散混合顆粒體系進(jìn)行數(shù)值研究。結(jié)果表明:在體積濃度低于10%時(shí),蒙特卡羅法預(yù)測得玻璃微珠或鐵粉顆粒聲衰減和ECAH,Lloyd和Berry,Waterman等建立的模型結(jié)果吻合。對于混合顆粒構(gòu)成的兩相體系,算例中,隨著體積濃度增大到10%,聲衰減系數(shù)隨混合顆粒數(shù)目比的變化呈現(xiàn)出了非線性的變化,同時(shí)顆粒物性也會影響不同組分顆粒對聲衰減的貢獻(xiàn),算例中鐵粉顆粒比玻璃微珠對聲衰減的影響更大。
[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.
【作者單位】： 上海理工大學(xué)能源與動(dòng)力工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51176128,51206113)資助
【分類號】：O42

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